You searched for subject:( nitrogen fertilizer).
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The Ohio State University
1.
Horner, Emily Renee.
THE EFFECT OF NITROGEN APPLICATION TIMING ON PLANT AVAILABLE
PHOSPHORUS.
Degree: MS, Horticulture and Crop Science, 2008, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1211932436 
► Phosphorus (P) use in the turfgrass industry has recently become heavily scrutinized due to its suspected contribution to eutrophication of lakes and streams. Inorganic…
(more)
▼ Phosphorus (P) use in the turfgrass industry
has recently become heavily scrutinized due to its suspected
contribution to eutrophication of lakes and streams. Inorganic P is
a highly immobile nutrient in the soil, binding tightly to organic
matter, soil particles, and minerals immediately following
fertilizer application. Though many studies have shown that P
run-off from turf is not a major source of water pollution, and in
many ways helps prevent it in urban and other settings,
restrictions are being placed on fertilization of turf with
products that contain P. The portion of P in the soil that is
available for plant use, inorganic P, is only a small fraction of
the total P that exists at any time in the soil. Phosphorus
transformations between the unavailable organic P form and
inorganic P in soil is not completely understood given that the
process depends on a combination of many factors such as soil
moisture; pH; temperature or seasonality; spacial variability;
presence or absence of other nutrients such as
nitrogen (N), iron
(Fe), aluminum (Al), carbon (C) and calcium (Ca); soil type;
microbial activity; climate; vegetation; etc. A
field study was conducted in 2006-2007 at the Ohio Turfgrass
Research and Educational Facility, Columbus, Ohio to observe the
effects of two of these factors, temperature or seasonality and the
presence of
nitrogen, on soil P availability. While applications of
nitrogen alone in the past have been shown to maintain or increase
available P levels in the soil, little evidence was seen here.
Regardless of
fertilizer treatment or timing, plant available P
levels in all plots continuously decreased throughout the study
indicating no treatment by time interaction. Some
fertilizer
treatment effects were observed that indicate that
nitrogen
fertilizer source can produce changes in plant available
phosphorus.
Advisors/Committee Members: Gardner, David (Advisor).
Subjects/Keywords: Horticulture; Phosphorus; turfgrass; Nitrogen; fertilizer
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APA (6th Edition):
Horner, E. R. (2008). THE EFFECT OF NITROGEN APPLICATION TIMING ON PLANT AVAILABLE
PHOSPHORUS. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1211932436
Chicago Manual of Style (16th Edition):
Horner, Emily Renee. “THE EFFECT OF NITROGEN APPLICATION TIMING ON PLANT AVAILABLE
PHOSPHORUS.” 2008. Masters Thesis, The Ohio State University. Accessed December 05, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1211932436.
MLA Handbook (7th Edition):
Horner, Emily Renee. “THE EFFECT OF NITROGEN APPLICATION TIMING ON PLANT AVAILABLE
PHOSPHORUS.” 2008. Web. 05 Dec 2019.
Vancouver:
Horner ER. THE EFFECT OF NITROGEN APPLICATION TIMING ON PLANT AVAILABLE
PHOSPHORUS. [Internet] [Masters thesis]. The Ohio State University; 2008. [cited 2019 Dec 05].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1211932436.
Council of Science Editors:
Horner ER. THE EFFECT OF NITROGEN APPLICATION TIMING ON PLANT AVAILABLE
PHOSPHORUS. [Masters Thesis]. The Ohio State University; 2008. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1211932436
University of Zambia
2.
Ntone, Keikanelwe.
Determination of Nitrogen fertilizer requirement in Bambara groundnut(Vigna Subterranea (L.)Verdc.)
.
Degree: 2011, University of Zambia
URL: http://hdl.handle.net/123456789/249
► This study was carried out during the 1993 /94 cropping season at the University of Zambia (UNZA) Farm and Lusitu Sub-Research Station which are situated…
(more)
▼ This study was carried out during the 1993 /94 cropping season
at the University of Zambia (UNZA) Farm and Lusitu Sub-Research
Station which are situated in Agroecological Zones II and I
(medium and low rainfall), respectively. The objective was to
determine the nitrogen fertilizer requirement for Bambara
groundnut using accessions of different yielding potential. A
split plot design was used, with six accessions (ZAVs 3, ZAVs 7,
ZAVs 120, ZAVs 6, ZAVs 5 and ZAVs 8) and five nitrogen levels (0,
15, 30, 45 and 60 kg N/ha) as main and sub plots, respectively.
The accessions were chosen on the basis of yielding potential,
i.e., low (ZAVs 6 and ZAVs 8), medium (ZAVs 7 and ZAVs 120) and
high (ZAVs 3 and ZAVs 5) as judged by results of a study carried
out during the 1992/93 season. The yield parameters measured
were: days to 50 % flowering, days to maturity, number of leaves
per plant, number of stems per plant, number of branches per
plant, number of nodes per plant, number of pods per plant, plant
spread, plant height, 100 seed weight and grain yield. However,
due to severe moisture deficit, yield was measured at UNZA Farm
only. The total nitrogen content of leaves at pod formation and
in the soil after harvesting were also measured. The results
indicated that at both locations, nitrogen fertilizer did not
have any effect on yield and all yield attributes measured except
plant spread and number of pods per plant. However, accessions
responded differently to N fertilizer, but this was true for ZAVs
7 only. Highest yields were obtained with 15 kg N /ha (321
kg/ha)grain, while the lowest was obtained with 30 kg N/ha
(65.70 kg/ha) while other treatments had similar. Yield was
V
positively correlated with number of leaves per plant, plant
height and the number of pods per plant. The nitrogen fertilizer
levels did not have any significant effect on plant N content
as well as on N content of the soil after harvesting. Location
had an effect on some yield attributes, i.e. , plants at UNZA Farm
were taller and wider with a higher number of stems than those
at Lusitu. Plants at Lusitu had 3.66 % N content which was
higher than UNZA Farm's 3.13 % N. The experiment was seriously
affected by moisture and temperature stress. The average yield
at UNZA farm was 183 kg/ha. A concrete conclusion cannot be made
from this experiment. It is therefore recommended that the
experiment be repeated under a controlled environment in order
to get a more accurate and reliable conclusion
Subjects/Keywords: Crop sicence;
Nitrogen fertilizer
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APA (6th Edition):
Ntone, K. (2011). Determination of Nitrogen fertilizer requirement in Bambara groundnut(Vigna Subterranea (L.)Verdc.)
. (Thesis). University of Zambia. Retrieved from http://hdl.handle.net/123456789/249
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ntone, Keikanelwe. “Determination of Nitrogen fertilizer requirement in Bambara groundnut(Vigna Subterranea (L.)Verdc.)
.” 2011. Thesis, University of Zambia. Accessed December 05, 2019.
http://hdl.handle.net/123456789/249.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ntone, Keikanelwe. “Determination of Nitrogen fertilizer requirement in Bambara groundnut(Vigna Subterranea (L.)Verdc.)
.” 2011. Web. 05 Dec 2019.
Vancouver:
Ntone K. Determination of Nitrogen fertilizer requirement in Bambara groundnut(Vigna Subterranea (L.)Verdc.)
. [Internet] [Thesis]. University of Zambia; 2011. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/123456789/249.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ntone K. Determination of Nitrogen fertilizer requirement in Bambara groundnut(Vigna Subterranea (L.)Verdc.)
. [Thesis]. University of Zambia; 2011. Available from: http://hdl.handle.net/123456789/249
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Humboldt State University
3.
Swenson, Nathan A.
Viability of wastewaster-derived algae as a source of nitrogen fertilizer.
Degree: MS, Natural Resources: Wildland Soil Science, 2009, Humboldt State University
URL: http://hdl.handle.net/2148/510
► Wastewater algae were harvested from the dissolved air flotation unit at the Sunnyvale Water Pollution Control Plant in Sunnyvale, CA, to determine algal biomass suitability…
(more)
▼ Wastewater algae were harvested from the dissolved air flotation unit at the Sunnyvale Water Pollution Control Plant in Sunnyvale, CA, to determine algal biomass suitability as a source of plant nutrition, specifically
nitrogen. AlgaRhythms, Inc., an Arcata-based company, is interested in utilizing algae from treatment plants to further the development of wastewater algae as a
fertilizer for use in retail markets.
The experiment compared the suitability of wastewater algae as a
fertilizer by comparing dry shoot biomass production, total Kjeldahl
nitrogen content of leaf tissue, and mineralizable
nitrogen content of growth medium to inorganic, organic, and commercial fertilizers. Annual ryegrass, Lolium multiflorum, and Wisconsin Fast Plants, Brassica rapa, were used as indicator organisms in a greenhouse potted plant study. Application rates of algae and other
nitrogen sources were 111, 222, and 445 kg N ha-1, along with four control groups that tested interactions with phosphorus, potassium, and micronutrients.
After 28 days of growth, Lolium multiflorum showed significant differences between fertilizers and application rates, with regard to dry biomass yield, but very little difference was shown in the mineralizable
nitrogen in the potting medium or in the total Kjeldahl
nitrogen content of the leaves. Scanning and transmission electron microscopy images of algal biomass were obtained to visually characterize isolated algae.
While lower application rates of algal biomass were not competitive with other fertilizers when considering yield, the highest application rate was similar to the
444 kg N ha-1 inorganic and commercial treatments, and the lowest application rate of organic
fertilizer. With its slower mineralization rate, wastewater algae have the potential to be a useful
fertilizer especially where nitrate leaching is common. The algal
fertilizer also contains high levels of carbon, which could help depleted soils improve organic matter levels while providing a source of fertility.
Advisors/Committee Members: Edinger-Marshall, Susan.
Subjects/Keywords: Fertilizer; Nitrogen; Algae; Wastewater
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APA (6th Edition):
Swenson, N. A. (2009). Viability of wastewaster-derived algae as a source of nitrogen fertilizer. (Masters Thesis). Humboldt State University. Retrieved from http://hdl.handle.net/2148/510
Chicago Manual of Style (16th Edition):
Swenson, Nathan A. “Viability of wastewaster-derived algae as a source of nitrogen fertilizer.” 2009. Masters Thesis, Humboldt State University. Accessed December 05, 2019.
http://hdl.handle.net/2148/510.
MLA Handbook (7th Edition):
Swenson, Nathan A. “Viability of wastewaster-derived algae as a source of nitrogen fertilizer.” 2009. Web. 05 Dec 2019.
Vancouver:
Swenson NA. Viability of wastewaster-derived algae as a source of nitrogen fertilizer. [Internet] [Masters thesis]. Humboldt State University; 2009. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/2148/510.
Council of Science Editors:
Swenson NA. Viability of wastewaster-derived algae as a source of nitrogen fertilizer. [Masters Thesis]. Humboldt State University; 2009. Available from: http://hdl.handle.net/2148/510
Virginia Tech
4.
Thompson, Ashley A.
The Effects of Rootstock Selection and Carbon-based Fertility Amendments on Apple Orchard Productivity and Soil Community Ecology.
Degree: PhD, Horticulture, 2016, Virginia Tech
URL: http://hdl.handle.net/10919/83441
► In apple (Malus domestica Borkh.) orchards, rootstock genotype, and soil fertility management practices impact soil fertility, plant associated soil microbial communities, and orchard productivity. Apple…
(more)
▼ In apple (Malus domestica Borkh.) orchards, rootstock genotype, and soil fertility management practices impact soil fertility, plant associated soil microbial communities, and orchard productivity. Apple growers select rootstocks to confer beneficial traits, including size control, precocity, and pest and disease resistance. Rootstock genotype may also influence microbial communities, resulting in changes that affect tree health and productivity. Many apple growers apply synthetic
nitrogen fertilizers to improve fruit yield and quality. In excess of tree requirements,
nitrogen fertilizers may reduce crop yield and quality, as well as contribute to water pollution. The addition of carbon-based amendments, such as yardwaste, chicken litter composts, and biochar, may potentially reduce
nitrogen and water loss, while improving soil structure and mineral nutrient availability. Orchard and pot-in-pot experiments were designed to study the following objectives: 1) determine the effects of integrated carbon-based
fertilizer amendments on tree growth, productivity, and orchard soil fertility, 2) assess the effects of biochar on tree growth, leaf mineral nutrition, soil physiochemistry, and microbial community structure and activity, and 3) understand how rootstocks and fertilizers alter soil microbial communities. Applications of composts, integrated compost-calcium nitrate fertilizers, and biochar increased soil carbon, organic matter, cation exchange capacity and microbial respiration. In the orchard study,
nitrogen fertilizer application did not increase tree growth, fruit quality, or leaf
nitrogen concentration. Biochar applied at high rates with
nitrogen fertigation increased tree growth and leaf
nitrogen concentration similar to
nitrogen fertigation. In the pot-in-pot compost study, chicken litter compost increased tree growth, and integrated compost-calcium nitrate
fertilizer applications increased leaf N concentration. Analysis of the microbial community structure of bulk soil samples from the biochar and compost pot-in-pot experiments determined that the community structure was similar for all treatments during the three-year study. Metagenomic sequencing of the rhizosphere bacterial community indicated that compost applications altered community diversity and evenness, and that compost treatments were more similar to each other than to the calcium nitrate treatment. Data from my dissertation research suggests that compost can be used to increase orchard soil fertility, tree growth, and leaf nutrition, and that compost applications increase soil microbial community diversity and activity.
Advisors/Committee Members: Peck, Gregory M. (committeechair), Williams, Mark A. (committee member), Maguire, Rory Owen (committee member), Wolf, Anthony K. (committee member).
Subjects/Keywords: Apples; Compost; Fertilizer; Nitrogen; Biochar
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APA ·
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APA (6th Edition):
Thompson, A. A. (2016). The Effects of Rootstock Selection and Carbon-based Fertility Amendments on Apple Orchard Productivity and Soil Community Ecology. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/83441
Chicago Manual of Style (16th Edition):
Thompson, Ashley A. “The Effects of Rootstock Selection and Carbon-based Fertility Amendments on Apple Orchard Productivity and Soil Community Ecology.” 2016. Doctoral Dissertation, Virginia Tech. Accessed December 05, 2019.
http://hdl.handle.net/10919/83441.
MLA Handbook (7th Edition):
Thompson, Ashley A. “The Effects of Rootstock Selection and Carbon-based Fertility Amendments on Apple Orchard Productivity and Soil Community Ecology.” 2016. Web. 05 Dec 2019.
Vancouver:
Thompson AA. The Effects of Rootstock Selection and Carbon-based Fertility Amendments on Apple Orchard Productivity and Soil Community Ecology. [Internet] [Doctoral dissertation]. Virginia Tech; 2016. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10919/83441.
Council of Science Editors:
Thompson AA. The Effects of Rootstock Selection and Carbon-based Fertility Amendments on Apple Orchard Productivity and Soil Community Ecology. [Doctoral Dissertation]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/83441
Iowa State University
5.
Studt, Jacob E.
Contrasting soil nitrogen dynamics under Zea mays and Miscanthus × giganteus: A story of complex interactions among site, establishment year, and nitrogen fertilization.
Degree: 2019, Iowa State University
URL: https://lib.dr.iastate.edu/etd/17571
► Perennial cropping systems have been proposed as an alternative to conventional, annual cropping systems to improve water quality by increasing nitrogen (N) retention in the…
(more)
▼ Perennial cropping systems have been proposed as an alternative to conventional, annual cropping systems to improve water quality by increasing nitrogen (N) retention in the plant and soil. In this study, I used a staggered-start experimental design to compare a perennial cropping system, miscanthus (Miscanthus × giganteus Greef et Deu.) at two stand-ages (mature (3 years old), and juvenile (establishment year)) with an annual cropping system, continuous corn (Zea mays L.), across two N fertility treatments of 0 and 224 kg N ha-1. This experiment was duplicated at two locations in Iowa, USA with similar soil parent material, but different background soil fertility due to past fertilizer management. I measured pools and processes associated with N cycling dynamics, including inorganic soil N, net N mineralization, and N leaching. Also measured were soil health indicators, including soil microbial biomass carbon (C) and N, and potentially mineralizable C and N. Measurements were taken at different frequencies over two years. One of the most salient findings in this study was mature miscanthus’ ability to alter soil microclimate properties. Mature miscanthus increased soil temperature by 134% in the winter, and decreased it by 16% during the growing season, compared to continuous corn. Also, during the growing season juvenile miscanthus decreased soil moisture by 10% compared to continuous corn. Across both sites and all treatments net soil N mineralization showed large variability, but the juvenile miscanthus treatment, on average, had the greatest cumulative net N mineralization, and mature miscanthus the lowest. Across all sites and N rates, mature miscanthus reduced nitrate-N leaching by 64% compared to continuous corn. Juvenile miscanthus leached the same amount of nitrate-N as continuous corn. Since miscanthus changed soil microclimate properties and N dynamics compared to continuous corn, it was surprising to find very little effect of miscanthus on soil health indicators – microbial biomass or potentially mineralizable C and N. However, the soil aggregates (< 2 mm diameter) under mature miscanthus could hold 11% more water than that under continuous corn. This study suggests that integrating miscanthus into the Midwestern Corn Belt would substantially reduce N leached through the soil profile, potentially preventing it from being lost to surface or groundwater. Miscanthus shows the potential to provide farm income while reducing the impact of agriculture on water quality, and some signs of improving soil health. More research is needed on the underlying mechanisms driving the differences in soil N dynamics between miscanthus and corn.
Subjects/Keywords: Miscanthus; Nitrate; Nitrogen; Nitrogen fertilizer; Nitrogen mineralization; Soil Science
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APA (6th Edition):
Studt, J. E. (2019). Contrasting soil nitrogen dynamics under Zea mays and Miscanthus × giganteus: A story of complex interactions among site, establishment year, and nitrogen fertilization. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/17571
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Studt, Jacob E. “Contrasting soil nitrogen dynamics under Zea mays and Miscanthus × giganteus: A story of complex interactions among site, establishment year, and nitrogen fertilization.” 2019. Thesis, Iowa State University. Accessed December 05, 2019.
https://lib.dr.iastate.edu/etd/17571.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Studt, Jacob E. “Contrasting soil nitrogen dynamics under Zea mays and Miscanthus × giganteus: A story of complex interactions among site, establishment year, and nitrogen fertilization.” 2019. Web. 05 Dec 2019.
Vancouver:
Studt JE. Contrasting soil nitrogen dynamics under Zea mays and Miscanthus × giganteus: A story of complex interactions among site, establishment year, and nitrogen fertilization. [Internet] [Thesis]. Iowa State University; 2019. [cited 2019 Dec 05].
Available from: https://lib.dr.iastate.edu/etd/17571.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Studt JE. Contrasting soil nitrogen dynamics under Zea mays and Miscanthus × giganteus: A story of complex interactions among site, establishment year, and nitrogen fertilization. [Thesis]. Iowa State University; 2019. Available from: https://lib.dr.iastate.edu/etd/17571
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Missouri – Columbia
6.
Boardman, Dara Lynn.
Assessment of enhanced efficiency urea products on maize in Missouri.
Degree: 2012, University of Missouri – Columbia
URL: http://hdl.handle.net/10355/35397
► Urea is the most commonly used N fertilizer, but has been found to be easily lost to the environment through volatilization and leaching. Enhanced efficiency…
(more)
▼ Urea is the most commonly used N
fertilizer, but has been found to be easily lost to the environment through volatilization and leaching. Enhanced efficiency fertilizers (EEF) have been developed to help prevent these losses. Field studies were conducted from 2009 to 2011 to determine the efficacy of five enhanced efficiency (EE) urea products compared to untreated urea, when surface-applied to no-till maize (Zea mays L.) grown on a Mexico Silt Loam (fine, smectitic, mesic, Vertic Epiaqualf). To determine NH3 volatilization, a static semi-open chamber system was used. Cumulative volatilization losses at 82 d after application ranged from 163 mg N m-2 to 767 mg N m-2 (2.57% to 8.37% of the applied N). Soil NO3- and NH4+ levels were also measured and were highest at approximately 30 days after fertilization and then significantly declined. Products that delayed the release of N the longest, such as Duration-75 and ESN, produced higher yields independent of ammonia volatilization. Maize leaf or canopy characteristics were assessed using a chlorophyll meter, reflectance spectrometry, and aerial. Normalized difference vegetative index (NDVI) and green normalized difference vegetative index (GNDVI) were calculated based on spectroradiometer measurements and NDVI was also calculated based on aerial imaging. It was determined that both NDVI and GNDVI correlated best with N concentration early in the season. Through aerial imaging, yield maps were produced that gave indication of the effectiveness of each product.
Advisors/Committee Members: Fritschi, Felix B., 1969- (advisor), University of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2012 Theses (other).
Subjects/Keywords: enhanced efficiency fertilizer; volatilization; product efficacy; nitrogen-based fertilizer
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APA ·
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APA (6th Edition):
Boardman, D. L. (2012). Assessment of enhanced efficiency urea products on maize in Missouri. (Thesis). University of Missouri – Columbia. Retrieved from http://hdl.handle.net/10355/35397
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Boardman, Dara Lynn. “Assessment of enhanced efficiency urea products on maize in Missouri.” 2012. Thesis, University of Missouri – Columbia. Accessed December 05, 2019.
http://hdl.handle.net/10355/35397.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Boardman, Dara Lynn. “Assessment of enhanced efficiency urea products on maize in Missouri.” 2012. Web. 05 Dec 2019.
Vancouver:
Boardman DL. Assessment of enhanced efficiency urea products on maize in Missouri. [Internet] [Thesis]. University of Missouri – Columbia; 2012. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10355/35397.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Boardman DL. Assessment of enhanced efficiency urea products on maize in Missouri. [Thesis]. University of Missouri – Columbia; 2012. Available from: http://hdl.handle.net/10355/35397
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Louisiana State University
7.
Garrett, Joseph Martin.
Effects of Application Timing and Soil Type on Optimal N Rate Requirement of Sugarcane (Saccharum spp.) and Changes in Soil Inorganic and Leaf N Concentrations.
Degree: MS, Agriculture, 2018, Louisiana State University
URL: https://digitalcommons.lsu.edu/gradschool_theses/4703
► Research is limited on the effects of soil types and early nitrogen (N) fertilizer applications to N management strategies in sugarcane (Saccharum spp.) production…
(more)
▼ Research is limited on the effects of soil types and early nitrogen (N) fertilizer applications to N management strategies in sugarcane (Saccharum spp.) production in Louisiana. This study was established in 2015 at two locations in St. Gabriel, LA to 1) determine the effect of fertilizer application timing and soil type on the optimal N rate requirement and yield of sugarcane and 2) relate the relationship of soil and leaf N content to yield at different growth stages with sugarcane yield. Treatments were set in a randomized block design on a clay soil and in a complete randomized design on silt loam soil, using sugarcane variety L01-299. Granular (Agrocote Max®, 45%N) and solution (urea ammonium nitrate solution-UAN, 32%N) N sources were applied at rates of 45, 90 and 135 kg N ha-1 and at two application timings (March and April). All treatments including a control (0 kg N ha-1) were replicated four times. Sugarcane yield was recorded at harvest. Sequential sampling of soil were done at two depths (0-15 and 15-30 cm) and leaf below the top visible dewlap (TVD). The N application timing did not have a large effect on inorganic N release within the soil particularly outside the active N uptake growth period of sugarcane. The optimal N rates on the silt loam soil using UAN fertilizer applied in March were 39 and 43 kg N ha-1, yielding 14,102 kg sugar ha-1 and 117 Mg cane ha-1. Yield for sugarcane applied with CRF were maximized at lower N rates, but resulted in lower yields. The positive linear relationship between leaf N content and yield was highest in mid-May sampling with r = 0.85 for cane and sugar yield. Highest correlations between leaf N content and soil inorganic N were all within 8 WANF, with April-applied fertilizer showing high correlations between the two variables earlier than March-applied fertilizer. The dynamic nature of inorganic N in Louisiana can be better understood and more efficiently utilized for sugarcane production through further research on the effects of N management practices and site-specific factors.
Subjects/Keywords: Nitrogen; Fertilizer; Fertiliser; Application; Sugarcane; Nutrient
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APA (6th Edition):
Garrett, J. M. (2018). Effects of Application Timing and Soil Type on Optimal N Rate Requirement of Sugarcane (Saccharum spp.) and Changes in Soil Inorganic and Leaf N Concentrations. (Masters Thesis). Louisiana State University. Retrieved from https://digitalcommons.lsu.edu/gradschool_theses/4703
Chicago Manual of Style (16th Edition):
Garrett, Joseph Martin. “Effects of Application Timing and Soil Type on Optimal N Rate Requirement of Sugarcane (Saccharum spp.) and Changes in Soil Inorganic and Leaf N Concentrations.” 2018. Masters Thesis, Louisiana State University. Accessed December 05, 2019.
https://digitalcommons.lsu.edu/gradschool_theses/4703.
MLA Handbook (7th Edition):
Garrett, Joseph Martin. “Effects of Application Timing and Soil Type on Optimal N Rate Requirement of Sugarcane (Saccharum spp.) and Changes in Soil Inorganic and Leaf N Concentrations.” 2018. Web. 05 Dec 2019.
Vancouver:
Garrett JM. Effects of Application Timing and Soil Type on Optimal N Rate Requirement of Sugarcane (Saccharum spp.) and Changes in Soil Inorganic and Leaf N Concentrations. [Internet] [Masters thesis]. Louisiana State University; 2018. [cited 2019 Dec 05].
Available from: https://digitalcommons.lsu.edu/gradschool_theses/4703.
Council of Science Editors:
Garrett JM. Effects of Application Timing and Soil Type on Optimal N Rate Requirement of Sugarcane (Saccharum spp.) and Changes in Soil Inorganic and Leaf N Concentrations. [Masters Thesis]. Louisiana State University; 2018. Available from: https://digitalcommons.lsu.edu/gradschool_theses/4703
University of Guelph
8.
Roy, Amal.
Soil Greenhouse Gas Emissions and Nitrogen Use Efficiency in Corn (Zea mays L) as Affected by Nitrogen Management
.
Degree: 2014, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8058
► Field experiments were conducted to examine the effect of rate, timing and history of urea-ammonium nitrate application on soil greenhouse gas (N2O, CO2 and CH4)…
(more)
▼ Field experiments were conducted to examine the effect of rate, timing and history of urea-ammonium nitrate application on soil greenhouse gas (N2O, CO2 and CH4) emissions, and NUE (agronomic efficiency, AE, and recovery efficiency, RE) in corn at Elora, ON, Canada. Gas emissions were quantified at three rates (30, 145 and 218 kg N ha-1), two timings (N injected in mid-row at planting and at around the V8 growth stage), and two histories (short-term: applying the N rate treatments on plots that had received 145 kg N ha-1 in the previous year, and long-term: applying the same N rate to a given plot over the duration of the trial) of N application for two years (2011 and 2012). NUE was examined over four years (2009 to 2012) using the same treatments as for gas emissions as well as two additional N rates (58 and 87 kg N ha-1). In 2011 and 2012, cumulative N2O emissions during the growing season and corn yields increased significantly with increasing N application rates. Cumulative N2O emissions in 2011 were significantly reduced when N was applied at the V8 stage (0.88 kg N2O-N ha-1) compared to at planting (2.12 kg N2O-N ha-1), with no significant impact on corn grain yield (average 9.1 Mg ha-1). Applying N at the V8 growth stage instead of at planting may be an effective N2O emission mitigation measure without affecting corn yield under conditions when soil moisture content is higher after planting than after the V8 growth stage. During 2009 to 2012, neither the timing nor the history of N application exerted any significant impact on agronomic efficiency (AE), or estimated maximum economic rate of
nitrogen (MERN) and the corresponding corn grain yields. Recovery efficiency (RE) of applied N was significantly improved by N applied at the V8 stage compared to at planting in 2011, and by long-term history of N application compared to short-term history in 2012. Neither in 2011 nor in 2012 were the cumulative CO2 and CH4 emissions during the growing season influenced by rate, timing, history, or the interaction of rate and timing of N application.
Advisors/Committee Members: Wagner-Riddle, Claudia (advisor).
Subjects/Keywords: Greenhouse gas emissions;
nitrogen use efficiency;
nitrogen fertilizer;
corn
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APA (6th Edition):
Roy, A. (2014). Soil Greenhouse Gas Emissions and Nitrogen Use Efficiency in Corn (Zea mays L) as Affected by Nitrogen Management
. (Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8058
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Roy, Amal. “Soil Greenhouse Gas Emissions and Nitrogen Use Efficiency in Corn (Zea mays L) as Affected by Nitrogen Management
.” 2014. Thesis, University of Guelph. Accessed December 05, 2019.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8058.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Roy, Amal. “Soil Greenhouse Gas Emissions and Nitrogen Use Efficiency in Corn (Zea mays L) as Affected by Nitrogen Management
.” 2014. Web. 05 Dec 2019.
Vancouver:
Roy A. Soil Greenhouse Gas Emissions and Nitrogen Use Efficiency in Corn (Zea mays L) as Affected by Nitrogen Management
. [Internet] [Thesis]. University of Guelph; 2014. [cited 2019 Dec 05].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8058.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Roy A. Soil Greenhouse Gas Emissions and Nitrogen Use Efficiency in Corn (Zea mays L) as Affected by Nitrogen Management
. [Thesis]. University of Guelph; 2014. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8058
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
9.
Valdez Velarca, Mariana.
Effects of Nitrogen Fertilization on Organic Rice Production.
Degree: 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/158705
► The increased demand for organic rice has led to a quick expansion of the industry; however, there has been little research conducted on organic rice…
(more)
▼ The increased demand for organic rice has led to a quick expansion of the industry; however, there has been little research conducted on organic rice systems that are relevant to the unique flooded paddy system that is used to produce organic rice. A critical issue for organic rice production is
nitrogen management.
A laboratory trial was conducted to better understand the N mineralization rates and dynamics. The specific objectives were to examine the role of cover crop and soil amendment on
nitrogen mineralization under aerobic and anaerobic conditions, as well as determine which combination of cover crop and organic amendment is optimum for a maximum N mineralization. Total mineralized
nitrogen over time under aerobic and anaerobic incubations of soil ? amended with Durana clover and Nature Safe (13-0-0) ? seemed to be dictated by the amount of available nitrate and nitrite, since a linear increase with time was observed for the ammonium content. Of the two factors analyzed ? amount of biomass and
nitrogen rate added ? enough statistical evidence was found to determine that the amount of N added via organic soil amendment has the greatest impact on the total amount of mineralized N. Finally, the combination of 100% cover crop plus 200 kg N/ha was determined as the optimum combination of cover crop and organic amendment because it mineralized the most N during the incubation period and presented only positive mineralization rates.
Complementary to the previous experiment, a greenhouse trial in Beaumont, TX, was conducted from May to August 2015 to study the effects that organic soil amendment (Nature Safe 13-0-0) with different rates of application (0, 50, 100, 150, 200, and 250 kg N/ha) had on the yield components in comparison with conventional rice production (urea
fertilizer 46-0-0). For the organic treatment, the highest yield and
nitrogen use efficiency (NUE) was reached at 200 kg N ha^-1 and not 250 kg N ^ha-1, which stated a quadratic function of added N and yield. Similar results were found for the conventional treatment, however, the NUE and highest yield were achieved at 150 kg N ha^-1 and 250 kg N ha^-1, respectively.
Advisors/Committee Members: Dou, Fugen (advisor), Gentry, Terry (advisor), Vogel, Jason (committee member).
Subjects/Keywords: organic rice; oryza sativa; organic agriculture; organic fertilizer; rice; nitrogen efficiency; nitrogen; nitrogen management
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APA (6th Edition):
Valdez Velarca, M. (2016). Effects of Nitrogen Fertilization on Organic Rice Production. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/158705
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Valdez Velarca, Mariana. “Effects of Nitrogen Fertilization on Organic Rice Production.” 2016. Thesis, Texas A&M University. Accessed December 05, 2019.
http://hdl.handle.net/1969.1/158705.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Valdez Velarca, Mariana. “Effects of Nitrogen Fertilization on Organic Rice Production.” 2016. Web. 05 Dec 2019.
Vancouver:
Valdez Velarca M. Effects of Nitrogen Fertilization on Organic Rice Production. [Internet] [Thesis]. Texas A&M University; 2016. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/1969.1/158705.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Valdez Velarca M. Effects of Nitrogen Fertilization on Organic Rice Production. [Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/158705
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Guelph
10.
Nasielski, Joshua.
Late nitrogen (N) fertilizer applications in maize: investigating N fluxes at the field and plant scale
.
Degree: 2019, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/16108
► With the increasing availability of high clearance equipment, there is growing interest in late N management strategies where a certain proportion of fertilizer N is…
(more)
▼ With the increasing availability of high clearance equipment, there is growing interest in late N management strategies where a certain proportion of
fertilizer N is applied much later in the season than is traditionally done. A suite of experiments was conducted to understand the physiologic response of maize to late N applications.
A field experiment was conducted to understand how yield formation in maize is affected by late N management strategies. It was found that the bulk of N
fertilizer can be delayed until 9-11 days before silking (V13) without any grain yield penalty. Mechanistically, this is because maize yield potential established just after silking is maximized at relatively low initial N rates. Low N rates become suboptimal in terms of yield only after silking. Thus, on soils which supply at least moderate amounts of indigenous N via mineralization, the bulk of
fertilizer N can be applied much closer to silking than traditionally done without yield penalty.
A greenhouse study found that the accumulation of luxury N prior to silking can help buffer grain yield against N stresses experienced after silking, and also elucidated the mechanisms responsible for this protective effect. To the extent that late N applications reduce luxury N uptake prior to silking, they may cause maize crops to be less resilient to shortfalls in post-silking N availability.
Late N applications presumably increase post-silking N uptake due to greater late-season soil N availability relative to N applications made around planting. A greenhouse study was conducted to better understand how exogenous soil N supply and maize N demand interact to regulate post-silking N uptake in maize. Our data supports a model that characterizes post-silking N uptake as a function of plant source-sink ratio, rather than solely a function of grain yield, post-silking biomass accumulation, or soil N supply.
After calibrating and validating the Denitirification and Decomposition (DNDC) computer model, the effects of 16 different N management strategies, including late N applications, on the environmental performance of economically optimum N rates (EONR) was assessed. Late N applications reduced leaching N losses at the EONR modestly (~7 kg N ha-1) but did not reduce yield-scaled N losses. It was found that N source and N placement decisions more strongly affect the agronomic and economic performance of the EONR relative to N timing.
Advisors/Committee Members: Deen, Bill (advisor).
Subjects/Keywords: maize;
nitrogen fertilizer;
late nitrogen applications;
nitrogen losses;
crop physiology;
agronomy;
DNDC model
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APA (6th Edition):
Nasielski, J. (2019). Late nitrogen (N) fertilizer applications in maize: investigating N fluxes at the field and plant scale
. (Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/16108
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nasielski, Joshua. “Late nitrogen (N) fertilizer applications in maize: investigating N fluxes at the field and plant scale
.” 2019. Thesis, University of Guelph. Accessed December 05, 2019.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/16108.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nasielski, Joshua. “Late nitrogen (N) fertilizer applications in maize: investigating N fluxes at the field and plant scale
.” 2019. Web. 05 Dec 2019.
Vancouver:
Nasielski J. Late nitrogen (N) fertilizer applications in maize: investigating N fluxes at the field and plant scale
. [Internet] [Thesis]. University of Guelph; 2019. [cited 2019 Dec 05].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/16108.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nasielski J. Late nitrogen (N) fertilizer applications in maize: investigating N fluxes at the field and plant scale
. [Thesis]. University of Guelph; 2019. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/16108
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade Federal de Santa Maria
11.
Nathalia Haydee Riveros Ciancio.
PRODUÇÃO DE GRÃOS, MATÉRIA SECA E ACÚMULO DE NUTRIENTES EM CULTURAS SUBMETIDAS À ADUBAÇÃO ORGÂNICA E MINERA.
Degree: 2010, Universidade Federal de Santa Maria
URL: http://coralx.ufsm.br/tede/tde_busca/arquivo.php?codArquivo=3218
► No Brasil, uma das principais atividades nas pequenas propriedades rurais é a criação de animais de pequeno porte. Os resíduos produzidos nesta atividade podem ser…
(more)
▼ No Brasil, uma das principais atividades nas pequenas propriedades rurais é a criação de animais de pequeno porte. Os resíduos produzidos nesta atividade podem ser utilizados como uma alternativa de adubação por conter uma série de elementos químicos prontamente disponíveis ou que após o processo de mineralização podem ser absorvidos pelas plantas. Entretanto, a composição desbalanceada dos adubos orgânicos devido ao tipo de alimentação e idade dos animais, além do manejo dado aos dejetos dificulta a recomendação e padronização de doses a serem aplicadas. Com o objetivo de avaliar diferentes doses crescentes de adubos orgânicos complementados com adubação mineral em cobertura avaliou-se a produtividade de grãos, produção de matéria seca é acúmulo de nutrientes (N, P, K, Ca e Mg) nas culturas do feijão, milho, sorgo e aveia preta. O estudo foi conduzido em duas áreas experimentais. No período de 2005 a 2008 utilizou-se a área experimental do Departamento de Solos da UFSM/RS. Já no período de 2008 a 2009 foi realizado em uma propriedade rural localizada no distrito de Boca do Monte, município de Santa Maria (RS). Os solos destas duas áreas foram classificados como Argissolo Vermelho Distrófico segundo Embrapa (2006). Os tratamentos consistiram nas doses de 10, 20 e 30 m3ha-1 de dejeto líquido de suíno e 1 e 2 t ha-1 de esterco de peru sem e com complementação de N mineral em cobertura. Além desses tratamentos, foi avaliada a recomendação mineral (NPK) segundo a CQFS-RS/SC (2004). Os dados de produtividade de grãos de feijão e milho, produção de matéria seca (MS) e acúmulo de nutrientes foram submetidos à análise estatística por contraste. Os resultados mostraram que doses de 30 m3ha-1 de dejetos líquidos de suínos e 2 t ha-1 de esterco de peru complementados com N mineral em cobertura favoreceram a produtividade de grãos, produção de matéria seca e acúmulo de nutrientes. A taxa de aproveitamento de N, P e K pelas plantas incrementaram até doses intermediarias de 10 m3ha-1 sem e com N mineral em cobertura, apontando que doses acima de 30 m3ha-1 de dejeto líquido de suínos, além de serem menos eficientes à nutrição de plantas, potencializam os riscos de contaminação do solo e da água.
In Brazil, one of the main activities on small farms is the creation of small animals. The waste produced in this activity can be used as an alternative fertilizer because it contains a number of chemicals readily available or after the process of mineralization can be absorbed by plants. However, the imbalanced composition of the organic fertilizers because of the type of feed and age of animals, in addition to the waste managed data hinders the recommendation and standardization of doses to be applied. Aiming to evaluate different increasing doses of organic fertilizers supplemented with mineral fertilizer topdressing evaluated the yield, production of dry matter accumulation of nutrients (N, P, K, Ca and Mg) in crops of beans, corn, sorghum and oats. The study was conducted in two experimental areas. In the period 2005 to 2008 we used…
Advisors/Committee Members: Carlos Alberto Ceretta, Gustavo Brunetto, Claudir José Basso.
Subjects/Keywords: fertilizante orgânico; adubação; CIENCIA DO SOLO; fertilizer, organic fertilizer; nitrogen; animal wastes; resíduos animais; nitrogênio
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APA (6th Edition):
Ciancio, N. H. R. (2010). PRODUÇÃO DE GRÃOS, MATÉRIA SECA E ACÚMULO DE NUTRIENTES EM CULTURAS SUBMETIDAS À ADUBAÇÃO ORGÂNICA E MINERA. (Thesis). Universidade Federal de Santa Maria. Retrieved from http://coralx.ufsm.br/tede/tde_busca/arquivo.php?codArquivo=3218
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ciancio, Nathalia Haydee Riveros. “PRODUÇÃO DE GRÃOS, MATÉRIA SECA E ACÚMULO DE NUTRIENTES EM CULTURAS SUBMETIDAS À ADUBAÇÃO ORGÂNICA E MINERA.” 2010. Thesis, Universidade Federal de Santa Maria. Accessed December 05, 2019.
http://coralx.ufsm.br/tede/tde_busca/arquivo.php?codArquivo=3218.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ciancio, Nathalia Haydee Riveros. “PRODUÇÃO DE GRÃOS, MATÉRIA SECA E ACÚMULO DE NUTRIENTES EM CULTURAS SUBMETIDAS À ADUBAÇÃO ORGÂNICA E MINERA.” 2010. Web. 05 Dec 2019.
Vancouver:
Ciancio NHR. PRODUÇÃO DE GRÃOS, MATÉRIA SECA E ACÚMULO DE NUTRIENTES EM CULTURAS SUBMETIDAS À ADUBAÇÃO ORGÂNICA E MINERA. [Internet] [Thesis]. Universidade Federal de Santa Maria; 2010. [cited 2019 Dec 05].
Available from: http://coralx.ufsm.br/tede/tde_busca/arquivo.php?codArquivo=3218.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ciancio NHR. PRODUÇÃO DE GRÃOS, MATÉRIA SECA E ACÚMULO DE NUTRIENTES EM CULTURAS SUBMETIDAS À ADUBAÇÃO ORGÂNICA E MINERA. [Thesis]. Universidade Federal de Santa Maria; 2010. Available from: http://coralx.ufsm.br/tede/tde_busca/arquivo.php?codArquivo=3218
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
12.
Mueller, Nathan D.
Improving
corn and soybean yield through fertility and weed management
practices.
Degree: PhD, Department of
Agronomy, 2012, Kansas State University
URL: http://hdl.handle.net/2097/14844
► Winter annual weeds (WAW) could affect nitrogen supply for corn production. The objectives of first study were to determine the diversity and abundance of WAW…
(more)
▼ Winter annual weeds (WAW) could affect
nitrogen supply
for corn production. The objectives of first study were to
determine the diversity and abundance of WAW and to evaluate the
effect of delaying herbicide applications on
nitrogen supply and
no-till corn response. Research was conducted in 2010 and 2011 at
14 sites in eastern Kansas. A factorial arrangement of three
herbicide application dates (Nov.-Mar., April, and May) and five N
rates were used. The three most abundant WAW across sites were
henbit, purslane speedwell, and horseweed. Delaying herbicide
application until April significantly reduced early corn N uptake
by 52 mg N plant-1, chlorophyll meter readings at silking by 3.4%,
and grain yield by 0.48 Mg ha-1 across sites. An additional 16 to
17 kg N ha-1 was needed to maintain yield if herbicide application
was delayed until April. Starter and foliar micronutrient
fertilization can potentially increase corn and soybean yield. The
objectives of the second study were to evaluate crop response from
combinations of starter and foliar fertilizers that contain N-P-K
mixtures with and without a blend of micronutrients at four sites
for each crop under irrigated conditions. No early corn growth or
yield increase was attributed to application of micronutrients (Fe,
Mn, Zn, Cu, and B) beyond what was achieved with N-P-K starter
fertilization. There was an increase in soybean height (8 cm) and
yield (293 kg ha-1) with starter
fertilizer containing N-P-K plus
micronutrients over the control. No increase in corn or soybean
yield was obtained with foliar fertilization. The objective of the
third study was to compare soil mobility and changes in soybean
nutrient concentration in the leaf and seed from Mn and Zn sources
(EDTA and oxysulfate) at two sites. Zinc sources were more mobile
in the soil. Both Zn sources increased seed Zn concentration.
Manganese oxysulfate increased seed Mn concentration. However,
soybean trifoliolate leaf and seed Mn concentration decreased with
soil-applied Na2EDTA and MnEDTA. This response was attributed to
formation of FeEDTA and increased Fe supply that reduced root Mn
absorption. Manganese EDTA is not recommended for soil
application.
Advisors/Committee Members: Dorivar Ruiz Diaz.
Subjects/Keywords: Micronutrients; Starter
fertilizer; Foliar
fertilizer; Winter
annual weeds;
Nitrogen;
Survey; Agronomy (0285)
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Manager
APA (6th Edition):
Mueller, N. D. (2012). Improving
corn and soybean yield through fertility and weed management
practices. (Doctoral Dissertation). Kansas State University. Retrieved from http://hdl.handle.net/2097/14844
Chicago Manual of Style (16th Edition):
Mueller, Nathan D. “Improving
corn and soybean yield through fertility and weed management
practices.” 2012. Doctoral Dissertation, Kansas State University. Accessed December 05, 2019.
http://hdl.handle.net/2097/14844.
MLA Handbook (7th Edition):
Mueller, Nathan D. “Improving
corn and soybean yield through fertility and weed management
practices.” 2012. Web. 05 Dec 2019.
Vancouver:
Mueller ND. Improving
corn and soybean yield through fertility and weed management
practices. [Internet] [Doctoral dissertation]. Kansas State University; 2012. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/2097/14844.
Council of Science Editors:
Mueller ND. Improving
corn and soybean yield through fertility and weed management
practices. [Doctoral Dissertation]. Kansas State University; 2012. Available from: http://hdl.handle.net/2097/14844
University of Zambia
13.
Makhale, Gerard Lekula.
Genotype and Nitrogen fertilizer influence on Grain yield and protein content of wheat(Triticum aestivum L.)
.
Degree: 2011, University of Zambia
URL: http://hdl.handle.net/123456789/161
► The grain yield of wheat in Lesotho is low because of poor soil fertility, and the wheat is regarded by the millers to be of…
(more)
▼ The grain yield of wheat in Lesotho is low because of poor soil fertility, and the wheat is regarded by the millers to be of poor quality and therefore of less value. A field study was therefore conducted at three sites in Lesotho( Maseru, Leribe and Mafeteng) to evaluate the influence of genotype and nitrogen application on grain yield and quality of wheat (Triticum aestivum L.) The varieties assessed were Tugela DN, Betta DN, SST 124 and caledon at a seeding rate of 50kg ha-1. Nitrogen was applied at five rates of 0,20,40,60, and 80 kg N ha-1. The experiment was arranged in a split-plot design, with varieties as the main- plot factor and nitrogen rates as the sub-plot factor. The treatment combinations were replicated three times . Grain yield and yield parameters (thousand-kernel weight , grain number per head, number of heads per square meter and harvest index) were measured. Quality parameters were protein content percent and mixograph development time. Grin yield significantly (P<_0.05) increased with Application at Leribe averaging 3000 kg ha-1. Number of heads per square meter was also significantly(P<_0.05) increased while thousand kernel weight was significantly (P<_0.05) decreased at rates of N application higher than 40kg N ha-1. At Maseru and Mafeteng applied N had no effect on grain yield. Infact grain yield decreased with application of N over 20kg N ha-1 at Mafeteng. The number of heads per square meter also significantly(P<_0.05) decreased, suggesting poor emergence or tillering. At Maseru the thousand kernel weight was significantly (P<_0.05) decreased with increasing nitrogen application. Across the three sites grain yield increased significantly (P<_0.05) when N was applied over 20kg N ha-1. The number of heads per square meter also significantly (P<_0.05) decreased at higher rates of N application. Applied N fertilizer (P<_0.05) increased grain protein content. However, the protein contents of wheat at Maseru and Mafeteng were higher, averaging 11% and 15% respectively. This observation is probably due to a concentration effect of protein content due to small grain size.Mixograph development times were within the acceptable range of 2.5-4.0 minutes for wheat from all the three sites. The four varieties did not significantly differ in grain yield or quality at all the three locations. However, they significantly differed in mixograph development times with Tugela DN giving the highest value averaging 4.0 minutes, and the lowest being caledon at 2.5 minutes. This study has shown that wheat yields and quality in Lesotho can be improved by applying before recommendations of N fertilizer rates and management strategies under dry land conditions can be made to farmers in Lesotho.
Subjects/Keywords: Nitrogen Fertilizer influence on Wheat;
Influence on Protein content of Wheat;
Genotype and Nitrogen Fertilizer influence-crops
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Manager
APA (6th Edition):
Makhale, G. L. (2011). Genotype and Nitrogen fertilizer influence on Grain yield and protein content of wheat(Triticum aestivum L.)
. (Thesis). University of Zambia. Retrieved from http://hdl.handle.net/123456789/161
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Makhale, Gerard Lekula. “Genotype and Nitrogen fertilizer influence on Grain yield and protein content of wheat(Triticum aestivum L.)
.” 2011. Thesis, University of Zambia. Accessed December 05, 2019.
http://hdl.handle.net/123456789/161.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Makhale, Gerard Lekula. “Genotype and Nitrogen fertilizer influence on Grain yield and protein content of wheat(Triticum aestivum L.)
.” 2011. Web. 05 Dec 2019.
Vancouver:
Makhale GL. Genotype and Nitrogen fertilizer influence on Grain yield and protein content of wheat(Triticum aestivum L.)
. [Internet] [Thesis]. University of Zambia; 2011. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/123456789/161.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Makhale GL. Genotype and Nitrogen fertilizer influence on Grain yield and protein content of wheat(Triticum aestivum L.)
. [Thesis]. University of Zambia; 2011. Available from: http://hdl.handle.net/123456789/161
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Kansas State University
14.
Ortez, Osler Antonio Amador.
Study of
nitrogen limitation and seed nitrogen sources for historical and
modern genotypes in soybean.
Degree: MS, Department of
Agronomy, 2018, Kansas State University
URL: http://hdl.handle.net/2097/38812
► Soybean [Glycine max (L.) Merr.] yields have continuously increased over time. Seed yields are determined by the genotype, environment, and management practices (G × E…
(more)
▼ Soybean [Glycine max (L.) Merr.] yields have
continuously increased over time. Seed yields are determined by the
genotype, environment, and management practices (G × E × M)
interaction. Closing yield gaps require a continuous improvement in
the use of the available resources, which must be attained via
implementation of better management decisions. Linear relationships
between seed yield and
nitrogen (N) demand are reported in the
scientific literature. Main sources of N to the plant are the
biological N fixation (BNF) and the soil mineralization processes.
On overall, only 50-60% of soybean N demand is met by the BNF
process. An unanswered scientific knowledge is still related to the
ability of the BNF to satisfy soybean N demand at varying yield
levels. Seed N demand not met by N fixation plus soil mineral N, is
then fulfilled by the remobilization of N from vegetative organs
during the seed filling period. An early remobilization process
reduces the photosynthetic activity (leaves) and can limit seed
yield. The objectives of this project were to: i) study yield
improvements and contribution of N via utilization of contrasting N
conditions under historical and modern soybean genotypes, and ii)
quantify main seed N sources during the seed filling period. For
objective one, four field experiments were conducted during the
2016 and 2017 growing seasons in Kansas, United States (US) and
Santa Fe Province, Argentina (ARG). Those experiments investigated
twenty-one historical and modern soybean genotypes with release
decades from 1980s to 2010s. As for objective two, three field
experiments were conducted during the 2015 and 2016 growing seasons
in Kansas, US, studying three soybean genotypes: non-roundup ready
(RR), released in 1997; RR-1, released in 2009; and RR-2, released
in 2014. Across all studies, seeds were inoculated and tested under
three N management strategies: i) control without N application
(Zero-N); ii) 56 kg N ha⁻¹ applied at reproductive growth stages
(Late-N); and iii) 670 kg ha⁻¹ equally split at three timings
(Full-N). As for yield improvements and N limitation, soybean yield
improvements from the 1980s to 2010s were documented, representing
29% increases in the US and 21% in ARG. Regarding N management, the
Full-N fertilization produced a 12% increase in seed yields in the
US and 4% in ARG. As for main seed N sources in objective two,
remobilization accounted for 59% of seed N demand, and was
negatively related to new N uptake occurring during the seed
filling period. Seed N demand for greater yields was dependent on
both, N remobilization and new N uptake, while for lower yields,
seed N demand was mainly supported by the N remobilization process.
These results suggest that: a) high seed yields are somehow limited
by the availability of N to express their potential, although the
question about N application still remains to be fully
investigated, as related to the timing and the environment by plant
interactions that could promote a N limitation in soybeans; b)
remobilization accounts for majority…
Advisors/Committee Members: Ignacio Ciampitti.
Subjects/Keywords: Nitrogen
fertilizer; Nitrogen
uptake; Nitrogen
remobilization; Seed yield
improvement; Seed
nitrogen sources; Historical
and modern genotypes
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APA (6th Edition):
Ortez, O. A. A. (2018). Study of
nitrogen limitation and seed nitrogen sources for historical and
modern genotypes in soybean. (Masters Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/38812
Chicago Manual of Style (16th Edition):
Ortez, Osler Antonio Amador. “Study of
nitrogen limitation and seed nitrogen sources for historical and
modern genotypes in soybean.” 2018. Masters Thesis, Kansas State University. Accessed December 05, 2019.
http://hdl.handle.net/2097/38812.
MLA Handbook (7th Edition):
Ortez, Osler Antonio Amador. “Study of
nitrogen limitation and seed nitrogen sources for historical and
modern genotypes in soybean.” 2018. Web. 05 Dec 2019.
Vancouver:
Ortez OAA. Study of
nitrogen limitation and seed nitrogen sources for historical and
modern genotypes in soybean. [Internet] [Masters thesis]. Kansas State University; 2018. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/2097/38812.
Council of Science Editors:
Ortez OAA. Study of
nitrogen limitation and seed nitrogen sources for historical and
modern genotypes in soybean. [Masters Thesis]. Kansas State University; 2018. Available from: http://hdl.handle.net/2097/38812
University of Illinois – Urbana-Champaign
15.
Bernhard, Brad Joseph.
Agronomic management to improve corn productivity under high-yielding environments.
Degree: PhD, Crop Sciences, 2019, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/104789
► Corn (Zea mays L.) grain yields have increased significantly in the U.S. since the 1930s largely due to genetic improvement and better crop management. Three…
(more)
▼ Corn (Zea mays L.) grain yields have increased significantly in the U.S. since the 1930s largely due to genetic improvement and better crop management. Three important management decisions a corn grower makes today are: 1) which hybrid to plant, 2) what population to plant, and 3) what
nitrogen (N) program to use. Hybrid selection is a critical management decision made by farmers because for any given year the spread in grain yield among current commercial hybrids that year can be greater than 100 bu acre-1. In addition, hybrids vary substantially in their response to management factors such as population and row spacing. Characterizing hybrids phenotypically for their yield-response to different plant spatial arrangement allows breeders, seed advisors, and farmers to predict which hybrids would have a positive yield-response to increased plant populations and narrower row spacings. Adequate fertility and plant nutrition, especially N, become even more important under these more intensive management systems. Better N placement and timing using the correct source can improve nutrient use efficiency and corn grain yield. For these reasons, the objective of this research was to quantify and predict how agronomic and nutritional management practices can be employed to improve corn productivity under high-yielding environments which encompasses three research areas:
How Does Plant Spatial Arrangement Affect Plant Architecture, Growth and Development, and Grain Yield?
Narrower row spacings were documented as a viable method to manage greater plant populations by increasing the plant-to-plant spacing within the crop row. As plant population increased, the yield difference due to row spacing increased. Changes in the architecture of the plant in response to narrower row spacings allowed for greater light penetration into the lower canopy when crowded at the higher population. Under competitive environments, (i.e. high plant populations) when resources became limited, plants produced more above-ground biomass at the expense of below-ground biomass. However, plants grown in a narrower spacing allocated more energy to producing below-ground biomass instead of above-ground biomass, subsequently reducing the shoot to root ratio.
Which Phenotypic Traits Do Hybrids Possess That Helps Them Yield More When Grown at Increased Populations and Narrower Row Spacings?
Of the six hybrids grown, three hybrids tended to be more positive yield-responsive to higher plant populations and narrower row spacings than the other three hybrids. In general, all six hybrids tended to have similar phenotypic responses to plant spatial arrangement. Thus, it was their inherently distinct phenotypic traits that differentiated them in their yield-response to plant population and/or row spacing alterations rather than the plasticity of their traits. The key traits for increased yields under increased plant populations and narrower row spacings were related to capturing more sunlight (leaf angle, leaf width, leaf length, and leaf area per plant), plant…
Advisors/Committee Members: Below, Frederick (advisor), Below, Frederick (Committee Chair), Brown, Howard (committee member), Mulvaney, Richard (committee member), Studer, Anthony (committee member).
Subjects/Keywords: hybrid; population; row spacing; nitrogen; plant spatial arrangement; nitrogen management; banding; fertilizer placement
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APA (6th Edition):
Bernhard, B. J. (2019). Agronomic management to improve corn productivity under high-yielding environments. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/104789
Chicago Manual of Style (16th Edition):
Bernhard, Brad Joseph. “Agronomic management to improve corn productivity under high-yielding environments.” 2019. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed December 05, 2019.
http://hdl.handle.net/2142/104789.
MLA Handbook (7th Edition):
Bernhard, Brad Joseph. “Agronomic management to improve corn productivity under high-yielding environments.” 2019. Web. 05 Dec 2019.
Vancouver:
Bernhard BJ. Agronomic management to improve corn productivity under high-yielding environments. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2019. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/2142/104789.
Council of Science Editors:
Bernhard BJ. Agronomic management to improve corn productivity under high-yielding environments. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2019. Available from: http://hdl.handle.net/2142/104789
16.
André Vilela Portugal.
Fontes de Nitrogênio no Cultivo de Milho em Sistema Plantio Direto: avaliação econômica e produtividade.
Degree: 2012, Universidade Jose do Rosario Vellano
URL: http://tede.unifenas.br/tde_busca/arquivo.php?codArquivo=110
► Na cultura do milho, o nitrogênio é o nutriente mais exigido, que mais afeta sua produtividade e o que mais onera o custo de produção.…
(more)
▼ Na cultura do milho, o nitrogênio é o nutriente mais exigido, que mais afeta sua produtividade e o que mais onera o custo de produção. Objetivou-se com o presente trabalho avaliar fontes de nitrogênio no cultivo de milho em sistema plantio direto. O experimento foi realizado na fazenda Vitória, situada no município de Alfenas MG, em uma área de primeiro ano de plantio direto. Para tanto, utilizou-se o híbrido de milho transgênico Impacto da Syngenta, e empregou-se delineamento experimental em blocos ao acaso, com 7 tratamentos e 4 repetições, totalizando 28 parcelas. Os tratamentos empregados foram constituídos por: Testemunha (ausência de N em cobertura); 100 Kg ha-1 de N em cobertura, com nitrato de amônio, sem incorporação; 100 Kg ha-1 de N em cobertura, com ureia, sem incorporação; 100 Kg ha-1 de N em cobertura, com ureia, com incorporação; 100 Kg ha-1 de N em cobertura, com sulfato de amônio, sem incorporação; 100 Kg ha-1 de N na semeadura, com fertilizante de liberação controlada, sem incorporação; 50 Kg ha-1 de N na semeadura, com fertilizante de liberação controlada, sem incorporação. As avaliações do experimento foram realizadas, após 154 dias, de acordo com os seguintes parâmetros: produtividade de grãos, número de fileira de grãos por espiga; peso de 1.000 grãos, número de grãos/fileira em cada espiga e número de grãos por espiga. Com o presente trabalho podemos concluir que: a ureia comum, o sulfato de amônio e nitrato de amônio apresentaram desempenho e retorno econômico semelhantes na cultura de milho em sistema plantio direto; a incorporação da ureia não favoreceu a produtividade de grãos e os componentes de produção no cultivo de milho em sistema plantio direto; o fertilizante de liberação controlada não é viável do ponto de vista econômico no cultivo de milho em sistema plantio direto.
In corn crop, nitrogen is the nutrient most required, which further affects their productivity and which further onerous the cost of production. The purpose of this study was to evaluate sources of nitrogen in corn growth in tillage system. The experiment was conducted at the Vitoria farm, located in the city of Alfenas - MG, in a area of the first year of tillage system. For this, it was used the transgenic corn hybrid Impact of Syngenta, and it was employed random blocks design experimental, with7 treatments and 4 replications, totaling 28 plots. The treatments applied consisted: Control (without nitrogen in coverage); 100 Kg ha-1 of nitrogen in coverage, with ammonium nitrate, without incorporation; 100 Kg ha-1 of nitrogen in coverage, with urea, without incorporation; 100 Kg ha-1 of nitrogen in coverage, with urea and incorporation; 100 Kg ha-1 of nitrogen in coverage, with ammonium sulfate, without incorporation; 100 Kg ha-1 of nitrogen in seeding, with controlled release fertilizer, without incorporation; 50 Kg ha-1 of nitrogen in seeding, with controlled release fertilizer, without incorporation. The assessments of the experiment were performed, after 154 days, according to the parameters: grains…
Advisors/Committee Members: Patrícia de Oliveira Alvin Veiga, José Messias Miranda, José Ricardo Mantovani.
Subjects/Keywords: zea mays; fertilizante nitrogenado; ureia; AGRONOMIA; zea mays; nitrogen fertilizer; urea
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APA (6th Edition):
Portugal, A. V. (2012). Fontes de Nitrogênio no Cultivo de Milho em Sistema Plantio Direto: avaliação econômica e produtividade. (Thesis). Universidade Jose do Rosario Vellano. Retrieved from http://tede.unifenas.br/tde_busca/arquivo.php?codArquivo=110
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Portugal, André Vilela. “Fontes de Nitrogênio no Cultivo de Milho em Sistema Plantio Direto: avaliação econômica e produtividade.” 2012. Thesis, Universidade Jose do Rosario Vellano. Accessed December 05, 2019.
http://tede.unifenas.br/tde_busca/arquivo.php?codArquivo=110.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Portugal, André Vilela. “Fontes de Nitrogênio no Cultivo de Milho em Sistema Plantio Direto: avaliação econômica e produtividade.” 2012. Web. 05 Dec 2019.
Vancouver:
Portugal AV. Fontes de Nitrogênio no Cultivo de Milho em Sistema Plantio Direto: avaliação econômica e produtividade. [Internet] [Thesis]. Universidade Jose do Rosario Vellano; 2012. [cited 2019 Dec 05].
Available from: http://tede.unifenas.br/tde_busca/arquivo.php?codArquivo=110.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Portugal AV. Fontes de Nitrogênio no Cultivo de Milho em Sistema Plantio Direto: avaliação econômica e produtividade. [Thesis]. Universidade Jose do Rosario Vellano; 2012. Available from: http://tede.unifenas.br/tde_busca/arquivo.php?codArquivo=110
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
17.
Cicero Monti Teixeira.
ConsÃrcio gramÃnea x leguminosa e adubaÃÃo nitrogenada no plantio direto do feijoeiro.
Degree: 2007, UNIVERSIDADE FEDERAL DE LAVRAS
URL: http://bibtede.ufla.br/tede//tde_busca/arquivo.php?codArquivo=978
► O objetivo foi avaliar a influÃncia da adubaÃÃo nitrogenada no rendimento de grÃos do feijoeiro e seus componentes primÃrios e na nutriÃÃo mineral da cultura…
(more)
▼ O objetivo foi avaliar a influÃncia da adubaÃÃo nitrogenada no rendimento de grÃos do feijoeiro e seus componentes primÃrios e na nutriÃÃo mineral da cultura sob palhada de milheto (Pennisetum typhoides (Burm.) Stapf) solteiro e consorciado com as leguminosas feijÃo-de-porco (Canavalia ensiformes (L.) DC.) no inverno/primavera e crotalÃria (Crotalaria juncea) no verÃo/outono, alÃm da decomposiÃÃo e liberaÃÃo de nutrientes das palhadas. O delineamento utilizado nos dois experimentos foi o de blocos casualizados, com quatro repetiÃÃes, em esquema de parcelas subdivididas. As parcelas foram constituÃdas pelas duas palhadas (milheto solteiro e consorciado) e as subparcelas pelo fatorial (2 x 4) + 1, representado por duas doses de N na semeadura (30 e 60 kg ha-1) e quatro em cobertura (0, 40, 80 e 120 kg ha-1), mais um tratamento adicional. O tratamento adicional foi constituÃdo pela dose de 30 kg ha-1 de N na semeadura, com inoculaÃÃo das sementes do feijoeiro com Rhizobium tropici e aplicaÃÃo foliar de Co e Mo. Nos estudos da decomposiÃÃo e da liberaÃÃo de nutrientes das palhadas foi utilizado o mÃtodo das âlitter bagsâ, em delineamento de blocos casualizados, com quatro repetiÃÃes, em esquema de parcelas subdivididas. As parcelas foram constituÃdas pelas duas palhadas e as subparcelas pelas Ãpocas de avaliaÃÃo ao longo do cultivo do feijoeiro (0, 8, 16, 24, 40, 56 e 72 dias apÃs a semeadura). No experimento de inverno/primavera a resposta do feijoeiro Ãs doses de N em cobertura para a massa de cem grÃos foi menor na palhada do consÃrcio, nÃo se refletindo no rendimento. O feijoeiro sob palhada de milheto+feijÃo-de-porco apresentou maior teor de N e Mg e menor teor de Ca. No experimento de verÃo/outono o maior rendimento de grÃos foi obtido sob palhada de milheto, nÃo havendo influÃncia das palhadas na nutriÃÃo do feijoeiro. Os consÃrcios apresentaram maior produÃÃo de fitomassa e maior ciclagem de nutrientes em relaÃÃo ao milheto solteiro.
The objective was evaluate the nitrogen fertilization in bean grain yield and its primary compounds and in the crop mineral nutrition under straws of single millet (Pennisetum typhoides (Burm.) Stapf) and millet plus jack bean (Canavalia ensiformes (L.) DC.) intercropping in winter/spring epoch and millet and millet plus Crotalaria juncea intercropping in summer/autumn epoch also the decomposition and nutrient release of the straws. Two experiments were carried out at Federal University of Lavras (Lavras, Minas Gerais state, Brazil) in a randomized blocks design and four replications in split plot arrangement, with the straws in the plots and nitrogen levels at sowing (30 e 60 kg ha-1) and at topdressing (0, 40, 80 and 120 kg ha-1) in a factorial (2 x 4) + 1 in sub-plots, plus an additional treatment with 30 kg ha-1 at sowing and bean seeds inoculation by Rhizobium tropici with Co and Mo foliar appliance. In straws decomposition and nutrient release studies were utilized the litter bags method, in randomized blocks design and four replications in split plot arrangement. The plots…
Advisors/Committee Members: Messias Josà Bastos de Andrade, MoÃzes de Souza Reis, Josà Mauro Valente Paes, Antonio Eduardo Furtini Neto, Gabriel Josà de Carvalho.
Subjects/Keywords: fertilizer; FITOTECNIA; nitrogen; FeijÃo; decomposiÃÃo; leguminous; plantio direto
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APA (6th Edition):
Teixeira, C. M. (2007). ConsÃrcio gramÃnea x leguminosa e adubaÃÃo nitrogenada no plantio direto do feijoeiro. (Thesis). UNIVERSIDADE FEDERAL DE LAVRAS. Retrieved from http://bibtede.ufla.br/tede//tde_busca/arquivo.php?codArquivo=978
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Teixeira, Cicero Monti. “ConsÃrcio gramÃnea x leguminosa e adubaÃÃo nitrogenada no plantio direto do feijoeiro.” 2007. Thesis, UNIVERSIDADE FEDERAL DE LAVRAS. Accessed December 05, 2019.
http://bibtede.ufla.br/tede//tde_busca/arquivo.php?codArquivo=978.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Teixeira, Cicero Monti. “ConsÃrcio gramÃnea x leguminosa e adubaÃÃo nitrogenada no plantio direto do feijoeiro.” 2007. Web. 05 Dec 2019.
Vancouver:
Teixeira CM. ConsÃrcio gramÃnea x leguminosa e adubaÃÃo nitrogenada no plantio direto do feijoeiro. [Internet] [Thesis]. UNIVERSIDADE FEDERAL DE LAVRAS; 2007. [cited 2019 Dec 05].
Available from: http://bibtede.ufla.br/tede//tde_busca/arquivo.php?codArquivo=978.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Teixeira CM. ConsÃrcio gramÃnea x leguminosa e adubaÃÃo nitrogenada no plantio direto do feijoeiro. [Thesis]. UNIVERSIDADE FEDERAL DE LAVRAS; 2007. Available from: http://bibtede.ufla.br/tede//tde_busca/arquivo.php?codArquivo=978
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Oklahoma State University
18.
Hedges, Wesley.
Starter Fertilizer Management for Corn and Soybean in the Southern Plains.
Degree: Department of Plant and Soil Sciences, 2012, Oklahoma State University
URL: http://hdl.handle.net/11244/9329
► Early plant growth and grain yield may be depressed in no-till cropping systems compared to conventional tillage because of the poor nutrient availability early in…
(more)
▼ Early plant growth and grain yield may be depressed in no-till cropping systems compared to conventional tillage because of the poor nutrient availability early in the growing season. Oklahoma no-till corn (Zea mays L.) and soybean (Glycine max L.) may benefit from starter
fertilizer because it places a band of available nutrients near the root-zone. The objectives of this study were to evaluate the effects of various starter
fertilizer placements and rates on full-season corn and soybean in the Southern Plains. Placement methods consisted of in-furrow, 2x2 (5 cm to the side and 5 cm below the seed), and 2x4 (5 cm to the side and 10 cm below the seed). The corn in-furrow treatments received N rates from 11 to 45 kg ha-1. Three additional corn in-furrow treatments were N + Zn, N + S, and N + Zn + S. The N was balanced to 168 kg ha-1 on all in-furrow corn treatments. The corn 2x2 treatments received N rates from 101 to 168 kg ha-1. The corn 2x4 treatments received N rates of 134 and 168 kg ha-1. The soybean in-furrow treatment received an N rate of 6 kg ha-1. The soybean 2x2 treatments received N rates from 11 to 34 kg ha-1. An additional soybean 2x2 treatment was N + Zn + S. Corn in-furrow placement at 11 kg N ha-1 increased early growth without decreasing stand emergence. No differences, for any corn locations, in initial stand counts were observed for 2x2 and 2x4 treatments at rates of 168 kg N ha-1. Corn NDVI decreased as rates increased from 101 to 168 kg N ha-1 in the 2x2 treatments. Corn grain yield was not affected by placement or rate of starter
fertilizer. Soybean in-furrow placement at 6 kg N ha-1 significantly reduced stand, but not yield. Soybean stand, early growth, and grain yield was not affected by any of the 2x2 treatments. Our results showed that starter
fertilizer placement and rate increased early growth in corn but had a minimal effect on yield when yield potential was low.
Advisors/Committee Members: Godsey, Chad B. (advisor), Arnall, Daryl Brian (committee member), Zhang, Hailin (committee member).
Subjects/Keywords: 2x2; 2x4; in-furrow; nitrogen; placement; starter fertilizer
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Manager
APA (6th Edition):
Hedges, W. (2012). Starter Fertilizer Management for Corn and Soybean in the Southern Plains. (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/9329
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hedges, Wesley. “Starter Fertilizer Management for Corn and Soybean in the Southern Plains.” 2012. Thesis, Oklahoma State University. Accessed December 05, 2019.
http://hdl.handle.net/11244/9329.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hedges, Wesley. “Starter Fertilizer Management for Corn and Soybean in the Southern Plains.” 2012. Web. 05 Dec 2019.
Vancouver:
Hedges W. Starter Fertilizer Management for Corn and Soybean in the Southern Plains. [Internet] [Thesis]. Oklahoma State University; 2012. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/11244/9329.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hedges W. Starter Fertilizer Management for Corn and Soybean in the Southern Plains. [Thesis]. Oklahoma State University; 2012. Available from: http://hdl.handle.net/11244/9329
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Tennessee – Knoxville
19.
Sullivan, Casey Theresa.
Contrasting Soil Management Practice, Nitrogen Source, and Harvest Method Effects on Corn Production in Ohio and Tennessee.
Degree: MS, Environmental and Soil Sciences, 2016, University of Tennessee – Knoxville
URL: https://trace.tennessee.edu/utk_gradthes/3748
► Current global agricultural production is completed with little regards to sustainable soil use. It is clear that the research and use of sustainable management…
(more)
▼ Current global agricultural production is completed with little regards to sustainable soil use. It is clear that the research and use of sustainable management practices must be expanded in order to preserve this natural resource. The objectives of this research were to focus on improving soil fertility and resource use efficiency by 1) evaluating farm management practices to find those that conserve soil and improve yields, 2) looking at alternative methods of fertilizing through the reuse of waste materials in agriculture. The last objective was to 3) test a more efficient method data collection and research production, resulting in more rapid outreach and use of sustainable methods.
A study initiated in May 2015 in Ohio compared no-till (NT) and tillage (T) management practices by examining the release of preserved
nitrogen (N) from a soil that has been under long-term no-till corn and soybean production. Crop N sufficiency and yields from the T and NT treatments were compared at varying urea application rates. The results showed that the T whole plot consistently provided higher N uptake, crop productivity, and yields when compared to the NT whole plot, but results may have been influenced by unusually high rainfall following
fertilizer application.
A study initiated in May 2015 in Tennessee tested the use of an industrial byproduct, spent microbial biomass (SMB) as a potential N source for corn. The biomass was compared at varying rates to the current farmer urea application rate.
Nitrogen availability and crop uptake was compared within the treatments and no significant differences between the urea treatment and SMB treatment yields were found, indicating that SMB could offer a sufficient source of N in local corn production.
To improve efficiency in corn research and data collection, a reduced effort hand-harvest method was compared to the currently accepted method in the Ohio and Tennessee studies. Yields extrapolated using the ten plant harvest method and the current hand harvest method were not found to be significantly different in either study (p>0.05). These results indicate the potential use of this method in future maize studies to improve project efficiency and increase research production.
Advisors/Committee Members: Neal S. Eash, Robert Freeland, Dayton Lambert, John Goddard.
Subjects/Keywords: Nitrogen; No-Till; Tillage; Alternative; Fertilizer; Agricultural Science
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APA (6th Edition):
Sullivan, C. T. (2016). Contrasting Soil Management Practice, Nitrogen Source, and Harvest Method Effects on Corn Production in Ohio and Tennessee. (Thesis). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_gradthes/3748
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sullivan, Casey Theresa. “Contrasting Soil Management Practice, Nitrogen Source, and Harvest Method Effects on Corn Production in Ohio and Tennessee.” 2016. Thesis, University of Tennessee – Knoxville. Accessed December 05, 2019.
https://trace.tennessee.edu/utk_gradthes/3748.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sullivan, Casey Theresa. “Contrasting Soil Management Practice, Nitrogen Source, and Harvest Method Effects on Corn Production in Ohio and Tennessee.” 2016. Web. 05 Dec 2019.
Vancouver:
Sullivan CT. Contrasting Soil Management Practice, Nitrogen Source, and Harvest Method Effects on Corn Production in Ohio and Tennessee. [Internet] [Thesis]. University of Tennessee – Knoxville; 2016. [cited 2019 Dec 05].
Available from: https://trace.tennessee.edu/utk_gradthes/3748.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sullivan CT. Contrasting Soil Management Practice, Nitrogen Source, and Harvest Method Effects on Corn Production in Ohio and Tennessee. [Thesis]. University of Tennessee – Knoxville; 2016. Available from: https://trace.tennessee.edu/utk_gradthes/3748
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Iowa State University
20.
Poffenbarger, Hanna Jane.
Nitrogen fertilization and crop diversity effects on soil carbon and nitrogen cycling in Iowa cropland.
Degree: 2017, Iowa State University
URL: https://lib.dr.iastate.edu/etd/16197
► Nitrogen is critical to sustaining the profitability and productivity of agricultural systems. However, plant-available forms of N are highly mobile and cropland N losses have…
(more)
▼ Nitrogen is critical to sustaining the profitability and productivity of agricultural systems. However, plant-available forms of N are highly mobile and cropland N losses have negative environmental consequences. Nitrogen management strategies differ depending on the farming system, with diverse crop rotations (i.e., those including perennial legume crops) and integrated crop-livestock systems relying primarily on biologically-fixed and recycled N, and simple maize (Zea mays L.)-based systems relying primarily on synthetic N fertilizer inputs. The goal of this research was to investigate C and N cycling in farming systems that span a range of N management strategies and to use this knowledge to advance sustainable N management.
Within continuous maize and maize-soybean [Glycine max (L.) Merr.] systems at four Iowa locations, I assessed changes in surface soil organic C (SOC) content over time across a range of N fertilizer rates. I found that N fertilization increased SOC content, with the greatest SOC storage in the optimally-fertilized continuous maize treatment. Using the continuous maize plots at two of these long-term N rate experiments, I investigated legacy impacts of N inputs on fertilizer N use efficiency by tracing isotopically-labeled N fertilizer into crop and soil pools. Fertilizer N recovery was less than 50% at both locations and exhibited a curvilinear response to historical N rate. In my third study, I used three long-term field experiments to determine the impact of crop rotation diversity on SOC content, biochemical composition, and distribution among physical fractions at different depths. Despite greater belowground C inputs in the diverse rotations, crop rotation diversity had inconsistent effects on SOC stocks, and minimal impact on the mechanisms of SOC storage. Finally, I compared the profitability of simple cash grain and integrated crop-livestock systems. The analysis revealed no effect of farming system on profitability, but indicated that more labor is required in the integrated crop-livestock system.
The results indicate that simple maize-based systems receiving agronomically optimum synthetic N inputs can sustain SOC and provide adequate financial returns, but result in high N losses from cropland. The adoption of biologically-based N management would reduce cropland N losses with minimal profit loss.
Subjects/Keywords: carbon; Corn Belt; fertilizer; nitrogen; rotation; Soil Science
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APA (6th Edition):
Poffenbarger, H. J. (2017). Nitrogen fertilization and crop diversity effects on soil carbon and nitrogen cycling in Iowa cropland. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/16197
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Poffenbarger, Hanna Jane. “Nitrogen fertilization and crop diversity effects on soil carbon and nitrogen cycling in Iowa cropland.” 2017. Thesis, Iowa State University. Accessed December 05, 2019.
https://lib.dr.iastate.edu/etd/16197.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Poffenbarger, Hanna Jane. “Nitrogen fertilization and crop diversity effects on soil carbon and nitrogen cycling in Iowa cropland.” 2017. Web. 05 Dec 2019.
Vancouver:
Poffenbarger HJ. Nitrogen fertilization and crop diversity effects on soil carbon and nitrogen cycling in Iowa cropland. [Internet] [Thesis]. Iowa State University; 2017. [cited 2019 Dec 05].
Available from: https://lib.dr.iastate.edu/etd/16197.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Poffenbarger HJ. Nitrogen fertilization and crop diversity effects on soil carbon and nitrogen cycling in Iowa cropland. [Thesis]. Iowa State University; 2017. Available from: https://lib.dr.iastate.edu/etd/16197
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Iowa State University
21.
Barker, Daniel W.
Utilization of active canopy sensors for nitrogen fertilizer management in corn.
Degree: 2011, Iowa State University
URL: https://lib.dr.iastate.edu/etd/10057
► The purpose of this research project was to provide much needed information for the development of active canopy sensors as a N fertilizer management decision…
(more)
▼ The purpose of this research project was to provide much needed information for the development of active canopy sensors as a N fertilizer management decision tool in corn production. Active sensors can be used as an information source regarding plant N status and, can be calibrated to help adjust in-season N applications when corn N deficiencies exist. The adoption of precision farming technology, such as active sensors, is growing in Iowa and much of the U.S. Corn Belt. This Ph.D. dissertation is presented as a series of five chapters. The first chapter is an overview of the dissertation research. The second chapter is entitled "Factors affecting active canopy sensor performance and reflectance measurements". The third chapter is entitled "Using active canopy sensors to quantify corn nitrogen stress and nitrogen application rate". This chapter was published in Agronomy Journal, Volume 102, Issue 3, 2010, pages 964-971. The fourth chapter is entitled "Active canopy sensing to adjust nitrogen application rate in corn". The fifth and final chapter provides the overall conclusions of the dissertation research. Chapters two and four are manuscripts that are intended to be submitted for publication in a journal from the American Society of Agronomy.
Subjects/Keywords: active; canopy; corn; fertilizer; nitrogen; sensing; Agronomy and Crop Sciences
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APA (6th Edition):
Barker, D. W. (2011). Utilization of active canopy sensors for nitrogen fertilizer management in corn. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/10057
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Barker, Daniel W. “Utilization of active canopy sensors for nitrogen fertilizer management in corn.” 2011. Thesis, Iowa State University. Accessed December 05, 2019.
https://lib.dr.iastate.edu/etd/10057.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Barker, Daniel W. “Utilization of active canopy sensors for nitrogen fertilizer management in corn.” 2011. Web. 05 Dec 2019.
Vancouver:
Barker DW. Utilization of active canopy sensors for nitrogen fertilizer management in corn. [Internet] [Thesis]. Iowa State University; 2011. [cited 2019 Dec 05].
Available from: https://lib.dr.iastate.edu/etd/10057.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Barker DW. Utilization of active canopy sensors for nitrogen fertilizer management in corn. [Thesis]. Iowa State University; 2011. Available from: https://lib.dr.iastate.edu/etd/10057
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Hawaii
22.
Silvasy, Tiare F.
Rate and Timing of Meat and Bone Meal (Tankage) Applications Influence Growth and Yield of Sweet Corn (Zea mays Var. Saccharata) and Soil Water Nitrate Concentrations in Two Hawaiian Soils.
Degree: 2019, University of Hawaii
URL: http://hdl.handle.net/10125/62806
Subjects/Keywords: maize; organic; fertilizer; nitrogen; synchronization
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APA (6th Edition):
Silvasy, T. F. (2019). Rate and Timing of Meat and Bone Meal (Tankage) Applications Influence Growth and Yield of Sweet Corn (Zea mays Var. Saccharata) and Soil Water Nitrate Concentrations in Two Hawaiian Soils. (Thesis). University of Hawaii. Retrieved from http://hdl.handle.net/10125/62806
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Silvasy, Tiare F. “Rate and Timing of Meat and Bone Meal (Tankage) Applications Influence Growth and Yield of Sweet Corn (Zea mays Var. Saccharata) and Soil Water Nitrate Concentrations in Two Hawaiian Soils.” 2019. Thesis, University of Hawaii. Accessed December 05, 2019.
http://hdl.handle.net/10125/62806.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Silvasy, Tiare F. “Rate and Timing of Meat and Bone Meal (Tankage) Applications Influence Growth and Yield of Sweet Corn (Zea mays Var. Saccharata) and Soil Water Nitrate Concentrations in Two Hawaiian Soils.” 2019. Web. 05 Dec 2019.
Vancouver:
Silvasy TF. Rate and Timing of Meat and Bone Meal (Tankage) Applications Influence Growth and Yield of Sweet Corn (Zea mays Var. Saccharata) and Soil Water Nitrate Concentrations in Two Hawaiian Soils. [Internet] [Thesis]. University of Hawaii; 2019. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10125/62806.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Silvasy TF. Rate and Timing of Meat and Bone Meal (Tankage) Applications Influence Growth and Yield of Sweet Corn (Zea mays Var. Saccharata) and Soil Water Nitrate Concentrations in Two Hawaiian Soils. [Thesis]. University of Hawaii; 2019. Available from: http://hdl.handle.net/10125/62806
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Manitoba
23.
Shaw, William.
Placement, timing and source of nitrogen fertilizer on yield of irrigated Russet Burbank Potato in Manitoba.
Degree: Soil Science, 2015, University of Manitoba
URL: http://hdl.handle.net/1993/31002
► Efficacious timing and rate of synthetic fertilizer nitrogen (N) application can reduce the amount of N needed to be applied for potato production. The purpose…
(more)
▼ Efficacious timing and rate of synthetic
fertilizer nitrogen (N) application can reduce the amount of N needed to be applied for potato production. The purpose of this study was to compare combinations of source, timing, and application methods of different synthetic N fertilizers on yield and quality of irrigated Russet Burbank, processing potato in Manitoba. Source, timing, and application method combinations were examined to provide a range of N availability over the growing season. This study was conducted at two sites over two years. Split applications of granular urea or Super-U, addition of ESN at planting and split application of granular urea at planting and fertigation were the most consistent treatments for highest marketable yield and
nitrogen use efficiency. ESN was advantageous in wet site conditions. The results indicate split application of granular urea and split granular urea and fertigation that growers of processing irrigated potato primarily use in Manitoba are sound management practices.
Advisors/Committee Members: Tenuta, Mario (Soil Science) (supervisor), Zvomuya, Francis (Soil Science) Cattani, Douglas (Plant Science) (examiningcommittee).
Subjects/Keywords: Synthetic nitrogen fertilizer; Timing; Placement; Source; Potato; Russet Burbank; Manitoba
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APA (6th Edition):
Shaw, W. (2015). Placement, timing and source of nitrogen fertilizer on yield of irrigated Russet Burbank Potato in Manitoba. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/31002
Chicago Manual of Style (16th Edition):
Shaw, William. “Placement, timing and source of nitrogen fertilizer on yield of irrigated Russet Burbank Potato in Manitoba.” 2015. Masters Thesis, University of Manitoba. Accessed December 05, 2019.
http://hdl.handle.net/1993/31002.
MLA Handbook (7th Edition):
Shaw, William. “Placement, timing and source of nitrogen fertilizer on yield of irrigated Russet Burbank Potato in Manitoba.” 2015. Web. 05 Dec 2019.
Vancouver:
Shaw W. Placement, timing and source of nitrogen fertilizer on yield of irrigated Russet Burbank Potato in Manitoba. [Internet] [Masters thesis]. University of Manitoba; 2015. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/1993/31002.
Council of Science Editors:
Shaw W. Placement, timing and source of nitrogen fertilizer on yield of irrigated Russet Burbank Potato in Manitoba. [Masters Thesis]. University of Manitoba; 2015. Available from: http://hdl.handle.net/1993/31002
Clemson University
24.
Park, Jiwoo.
Fertilizer and Paclobutrazol Effects on Petunia Production and Post-production Performance.
Degree: MS, 2019, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/3183
► Reducing the amount of fertilizer applied to the plants in ornamental plant production industry is a growing trend due to rising environmental concerns; however,…
(more)
▼ Reducing the amount of
fertilizer applied to the plants in ornamental plant production industry is a growing trend due to rising environmental concerns; however, reduced fertilization can result in the failure to supply the retail customer with a plant that contains enough nutrients to sustain further growth in the consumer environment where
fertilizer application is frequently lacking. Therefore, the objective of the first study was to examine alternative
fertilizer delivery strategies that can maintain petunia quality during greenhouse production and continue to sustain plant growth and flowering in the post-production consumer environment. The
fertilizer treatments applied to the plants were defined by a 4×3×3 factorial consisting of four constant liquid fertilization (CLF) concentrations (0, 50, 100, or 200 mg.L-1 N), three controlled-release fertilization (CRF) concentrations (0, 2.4, or 4.7 kg.m 1), and three pulse fertilization (PF) concentrations (0, 300, or 600 mg.L-1 N). The results showed that both CRF and PF had positive effect on growth and flowering of the finished product quality as well as during the subsequent post-production consumer performance. The only negative effect observed in the increased fertilization treatment was the additional growth that occurred during the greenhouse phase. So, a second study was designed to examine the interaction between CLF and plant growth regulator, paclobutrazol (rac-(2R,3R)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)pentan-3-ol). Paclobutrazol application is a common practice in bedding plant production in order to achieve a more compact plant that increases shipping capacity and tolerance to postharvest handling stresses. The
fertilizer and paclobutrazol treatments applied to the plants were defined by a factorial combination of four CLF concentrations (50, 100, 150, or 200 mg.L-1 N) and four paclobutrazol concentrations (0, 5, 10, or 20 mg.L 1). The results showed that paclobutrazol successfully reduced the growth of plants in the high CLF treatments, but also continued to reduce plant growth and flowering throughout the post-production phase. From these observations we conclude that when applied at the proper rate, paclobutrazol can improve the finished product quality as well as post-production performance, but excessive paclobutrazol application results in poor growth in the consumer environment.
Advisors/Committee Members: James E Faust, Committee Chair, Haibo Liu, Sruthi Narayanan.
Subjects/Keywords: consumer; controlled-release fertilizer; nitrogen; ornamental plants; plant growth regulator
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APA (6th Edition):
Park, J. (2019). Fertilizer and Paclobutrazol Effects on Petunia Production and Post-production Performance. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/3183
Chicago Manual of Style (16th Edition):
Park, Jiwoo. “Fertilizer and Paclobutrazol Effects on Petunia Production and Post-production Performance.” 2019. Masters Thesis, Clemson University. Accessed December 05, 2019.
https://tigerprints.clemson.edu/all_theses/3183.
MLA Handbook (7th Edition):
Park, Jiwoo. “Fertilizer and Paclobutrazol Effects on Petunia Production and Post-production Performance.” 2019. Web. 05 Dec 2019.
Vancouver:
Park J. Fertilizer and Paclobutrazol Effects on Petunia Production and Post-production Performance. [Internet] [Masters thesis]. Clemson University; 2019. [cited 2019 Dec 05].
Available from: https://tigerprints.clemson.edu/all_theses/3183.
Council of Science Editors:
Park J. Fertilizer and Paclobutrazol Effects on Petunia Production and Post-production Performance. [Masters Thesis]. Clemson University; 2019. Available from: https://tigerprints.clemson.edu/all_theses/3183
University of Illinois – Urbana-Champaign
25.
Holscher, Jude A.
Effect of winter cover cropping practices on maize yield and nutrient cycling.
Degree: MS, Technical Systems Management, 2016, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/95554
► The Illinois Nutrient Loss Reduction Strategy has set Phase 1 reduction milestones for nitrate-nitrogen and total phosphorus of 15 percent and 25 percent, respectively, to…
(more)
▼ The Illinois Nutrient Loss Reduction Strategy has set Phase 1 reduction milestones for nitrate-
nitrogen and total phosphorus of 15 percent and 25 percent, respectively, to the Mississippi River by the year 2025 with the ultimate goal of a 45 percent reduction for both nutrients when compared to average annual riverine loading for years 1980-1996. With estimated levels of 80 percent and 48 percent of nitrate-N and total-P nutrient loads coming from agriculture, the reduction strategy stresses the importance of farmers’ voluntary implementation of best management strategies in order to reach these goals. The purpose of this study was to compare the differences in nutrient cycling of
nitrogen and phosphorus from an annual rye winter cover-cropped treatment to a conventional tillage control (fall chisel and spring field cultivation) by measuring preseason fertility, nutrient flux in subsurface tile lines, end of season soil fertility, and crop yields for each treatment. Best management practices consisted of a no-till cover crop scenario with side-dressed
nitrogen application at vegetative growth stage 4 (V4). Soil fertility and crop nutrient uptake was measured prior to cover crop termination and again at crop maturity. Throughout the growing season, tile water was collected and analyzed for nitrate and phosphate concentrations. Cumulative losses from April-July 2015 of nitrate
nitrogen were calculated at 10.61 and 11.69 kg ha-1 NO3-N for the annual rye treatment and conventional treatment, respectively. Weighted mean nitrate-nitrite
nitrogen concentrations in subsurface drainage tile were 4.41 and 6.10 ppm for annual rye and conventional treatments for the same time period. Soil fertility measures of organic matter,
nitrogen, and phosphorus did not have a conclusive impact on the final yields of each representative treatment, however, seven out of the top ten yielding annual rye treatments were on the soil with a higher Illinois Soil
Nitrogen Test (ISNT).
Nitrogen fertilizer rates and timing had a significant impact on final yields with the highest yield being 16.9 Mg ha-1 (271 bu ac-1) at a
nitrogen fertilizer rate of 177 kg ha-1 (158 lb ac-1) for the conventional tillage treatment and 16.4 Mg ha-1 (261 bu ac-1) for the no-till annual rye winter cover treatment at a
fertilizer rate of 206 kg ha-1 (184 lb ac-1). These results indicate a higher
nitrogen rate is necessary for equal yields when a no till winter cover is compared to a conventional tillage plot if water is not a yield limiting factor.
Advisors/Committee Members: Davidson, Paul C. (advisor).
Subjects/Keywords: Cover crop; fertilizer; corn; nitrogen; leaching; tile drainage; nitrate; phosphate
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APA (6th Edition):
Holscher, J. A. (2016). Effect of winter cover cropping practices on maize yield and nutrient cycling. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/95554
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Holscher, Jude A. “Effect of winter cover cropping practices on maize yield and nutrient cycling.” 2016. Thesis, University of Illinois – Urbana-Champaign. Accessed December 05, 2019.
http://hdl.handle.net/2142/95554.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Holscher, Jude A. “Effect of winter cover cropping practices on maize yield and nutrient cycling.” 2016. Web. 05 Dec 2019.
Vancouver:
Holscher JA. Effect of winter cover cropping practices on maize yield and nutrient cycling. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2016. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/2142/95554.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Holscher JA. Effect of winter cover cropping practices on maize yield and nutrient cycling. [Thesis]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/95554
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Tech
26.
McClanahan, Sarah Jane.
Evaluation of Cover Crops, Conservation Tillage, and Nitrogen Management in Cotton Production in Southeastern Virginia.
Degree: MS, Crop and Soil Environmental Sciences, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/89921
► Upland cotton (Gossypium hirsutum L.) response to diverse species cover crop mixes, conservation tillage method, fertilizer N rate, and fertilizer N placement at side-dress was…
(more)
▼ Upland cotton (Gossypium hirsutum L.) response to diverse species cover crop mixes, conservation tillage method,
fertilizer N rate, and
fertilizer N placement at side-dress was measured in two field studies conducted on the coastal plain soil in Virginia and North Carolina from 2016-2018. The objectives of the following research were to 1) examine the influence of two conservation tillage practices and four cover crop mixes on cover crop biomass production, soil compaction, cover crop nutrient uptake, soil N cycling, petiole nitrate (NO3-N) and cotton lint yield and 2) measure cotton performance in response to five N rate and three placement application methods. Legume mix (LM) cover crops contained more N in biomass, resulting in higher soil NO3-N during the growing season and higher lint yields at harvest compared to a legume mix and rye combination (LMR), rye, and fallow treatments. Soil compaction and lint yield were not significantly different between strip-tilled and no-till/tillage radish treatments in either year.
Nitrogen rate and placement had a significant effect on lint yield but only N rate affected petiole NO3-N concentration. Injection of
fertilizer N required an N rate of 133 kg N ha1 to achieve 95% relative yield while surface banded
fertilizer N required a rate of 128 kg N ha-1 to produce 90% relative yield. A critical petiole NO3-N concentration threshold of 5,600 mg NO3-N kg-1 was also calculated to reach 92% relative yield. Future application of these results can include investigation of optimal N source for Virginia cotton production, best N placement method for cotton grown in high residue systems, and an economic analysis to determine optimum agronomic management for Virginia coastal plain cotton production.
Advisors/Committee Members: Frame, William Hunter (committeechair), Stewart, Ryan Daniel (committee member), Thomason, Wade Everett (committee member).
Subjects/Keywords: upland cotton; cover crops; conservation tillage; nitrogen management; fertilizer placement
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APA (6th Edition):
McClanahan, S. J. (2019). Evaluation of Cover Crops, Conservation Tillage, and Nitrogen Management in Cotton Production in Southeastern Virginia. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/89921
Chicago Manual of Style (16th Edition):
McClanahan, Sarah Jane. “Evaluation of Cover Crops, Conservation Tillage, and Nitrogen Management in Cotton Production in Southeastern Virginia.” 2019. Masters Thesis, Virginia Tech. Accessed December 05, 2019.
http://hdl.handle.net/10919/89921.
MLA Handbook (7th Edition):
McClanahan, Sarah Jane. “Evaluation of Cover Crops, Conservation Tillage, and Nitrogen Management in Cotton Production in Southeastern Virginia.” 2019. Web. 05 Dec 2019.
Vancouver:
McClanahan SJ. Evaluation of Cover Crops, Conservation Tillage, and Nitrogen Management in Cotton Production in Southeastern Virginia. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10919/89921.
Council of Science Editors:
McClanahan SJ. Evaluation of Cover Crops, Conservation Tillage, and Nitrogen Management in Cotton Production in Southeastern Virginia. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/89921
Colorado State University
27.
Sukor, Arina.
Organic nitrogen fertilizers influence nutritional value, water use efficiency, and nitrogen dynamics of drip irrigated lettuce and sweet corn.
Degree: PhD, Soil and Crop Sciences, 2016, Colorado State University
URL: http://hdl.handle.net/10217/173351
► Farmers usually rely on off-farm sources (fish emulsion, feather meal, blood meal) for the additional N needed during the growing season, and they are willing…
(more)
▼ Farmers usually rely on off-farm sources (fish emulsion, feather meal, blood meal) for the additional N needed during the growing season, and they are willing to pay the extra shipping cost. However, there is another
fertilizer option being developed that could allow farmers to produce N on-farm, which is cyanobacteria, formerly known as the blue green algae. The general objectives of this study were to assess effects of organic N
fertilizer application and N rates on nutritional value, water use efficiency, N dynamics of sweet corn and lettuce. A two-year field study was conducted in the summers of 2013 and 2014 at the Colorado State University Horticulture Research Center, Fort Collins, CO. The fertilizers used in this study were blood meal, feather meal, fish emulsion, and cyano-
fertilizer. Both fish emulsion and cyano-
fertilizer were supplied in four split applications over the growing season through drip irrigation, while the blood meal and feather meal were subsurface banded prior to planting. Lettuce and sweet corn were used as an indicator to evaluate effects of organic
nitrogen (N) fertilizers on nutritional value, water use efficiency, and N dynamics. The aims of this study were to evaluate the effect of different types of organic N
fertilizer on nutritional value; β-carotene, iron (Fe), zinc (Zn), marketable yield, water use efficiency (WUE), residual soil nitrate-N, N content, and N use efficiency (NUE) of horticultural crops, particularly lettuce and sweet corn. All
fertilizer treatments in 2013 increased β-carotene concentration in leaf tissue compared to control, while only fish emulsion had a higher β-carotene concentration compared to other treatments in 2014. The high indole-3-acetic acid (IAA) applied in the fish emulsion treatment could have increased β- carotene concentration in lettuce in both years. Amount of IAA applied in the fish emulsion treatment was positively correlated with β-carotene concentration in both years. A significant negative correlation was found between marketable yield and β-carotene concentration in leaf tissue in 2014. High salicylic acid (SA) applied in the cyano-
fertilizer treatment had a higher total leaf area compared to other fertilizers in both years. In lettuce, the blood meal treatment had a lower leaf Fe and Zn concentrations than other
fertilizer treatments at 112 kg N ha-1. The cyano-
fertilizer treatment had a higher leaf Fe concentration at 56 kg N ha-1. Leaf N concentration was positively correlated with Leaf Fe and Zn concentrations. Amount of NO3- -N applied in organic N fertilizers was negatively correlated with leaf Fe concentration. The cyano-
fertilizer, fish emulsion, and blood meal treatments increased Fe concentration in sweet corn compared to feather meal. Amount of NO3- -N, Fe, and Zn applied in organic N fertilizers were positively correlated with kernel Fe concentration, while amount of NH4+ -N applied was negatively correlated with kernel Fe concentration. There was no N rate or treatment effect on leaf and kernel N concentrations in sweet corn.…
Advisors/Committee Members: Davis, Jessica G. (advisor), Schipanski, Meagan E. (committee member), Qian, Yaling (committee member), Argueso, Cristiana (committee member).
Subjects/Keywords: Cyanobacteria; Nitrogen; Sweet corn; Lettuce; Biofertilizer; Organic fertilizer
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APA (6th Edition):
Sukor, A. (2016). Organic nitrogen fertilizers influence nutritional value, water use efficiency, and nitrogen dynamics of drip irrigated lettuce and sweet corn. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/173351
Chicago Manual of Style (16th Edition):
Sukor, Arina. “Organic nitrogen fertilizers influence nutritional value, water use efficiency, and nitrogen dynamics of drip irrigated lettuce and sweet corn.” 2016. Doctoral Dissertation, Colorado State University. Accessed December 05, 2019.
http://hdl.handle.net/10217/173351.
MLA Handbook (7th Edition):
Sukor, Arina. “Organic nitrogen fertilizers influence nutritional value, water use efficiency, and nitrogen dynamics of drip irrigated lettuce and sweet corn.” 2016. Web. 05 Dec 2019.
Vancouver:
Sukor A. Organic nitrogen fertilizers influence nutritional value, water use efficiency, and nitrogen dynamics of drip irrigated lettuce and sweet corn. [Internet] [Doctoral dissertation]. Colorado State University; 2016. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10217/173351.
Council of Science Editors:
Sukor A. Organic nitrogen fertilizers influence nutritional value, water use efficiency, and nitrogen dynamics of drip irrigated lettuce and sweet corn. [Doctoral Dissertation]. Colorado State University; 2016. Available from: http://hdl.handle.net/10217/173351
University of Guelph
28.
DeBruyn, Amanda.
Plant Density, Harvest Date, and Fertilizer Impact on Sugarbeet (Beta vulgaris L.) Root and Sucrose Yield, N Dynamics, and Profit Margins
.
Degree: 2017, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/10191
► Local (southwestern Ontario and Michigan) sugarbeet production practices have changed to an earlier harvest date (early/mid Sept. vs. late Oct. early Nov.) and increased plant…
(more)
▼ Local (southwestern Ontario and Michigan) sugarbeet production practices have changed to an earlier harvest date (early/mid Sept. vs. late Oct. early Nov.) and increased plant density (114, 800 plants ha-1 at 57 cm vs. 86, 500 plants ha-1 at a row width of 76 cm) using high yielding glyphosate-resistant sugarbeet varieties. In addition, crop consultants have recommended including N
fertilizer in a 5-by-5 cm band during sugarbeet planting. Nutrient management is an essential aspect of crop production, and more specifically, in sugarbeet production as quality and root yield are negatively and positively, respectively, influenced by N fertility. Therefore, the effects of these changes in crop production practices on root and sucrose yield, profit margins, N dynamics, and
nitrogen use efficiency (NUE) were evaluated at two fields in 2013-2015 with two harvest dates. Application rates of 157 kg N ha-1 to optimize root yield but only 12 kg N ha-1 to optimize recoverable white sucrose per tonne (RWST) were observed at either harvest date. Conversely, profit margins calculated using Michigan Sugar Company (MSC) 5-year average payment standards favour an optimal profit margin application rate of 127-136 kg N ha-1 for early and late harvest, respectively. The effect of harvest date and N and P
fertilizer placement, source, and timing was not influential on NUE and N loss indicators and a lack of difference between NUE indices and yield slightly favoured the application of N and P in a 5-by-5 cm band at planting together or alone compared to the zero N-P control. Therefore, results do not contradict current industry recommendations; however, there is no compelling evidence to suggest farmers should modify planters to include N
fertilizer at planting unless already capable. Further, plant density and harvest date had no influence on N
fertilizer requirements tor most profitable rate of N. However, an early harvest resulted in lower root yield, RWST, and N removal from the field. It is therefore recommended that, under current payment protocols, N
fertilizer should be applied at rates 27-57 kg N ha-1 greater than the current application of 100 kg N ha-1 and can be applied at the same rate regardless of harvest date or plant density. However, NUE calculations suggest that an earlier harvest may result in higher risk of N losses compared to late, and as such, growers may wish to harvest later or consider implementing N loss mitigation strategies.
Advisors/Committee Members: Van Eerd, Laura (advisor).
Subjects/Keywords: plant density;
sugarbeet;
nitrogen;
quality;
optimal nitrogen;
most economical rate of nitrogen;
fertilizer placement;
fertilizer timing;
sugar beet;
row spacing;
harvest date;
plant population;
profit margins;
beta vulgaris
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APA (6th Edition):
DeBruyn, A. (2017). Plant Density, Harvest Date, and Fertilizer Impact on Sugarbeet (Beta vulgaris L.) Root and Sucrose Yield, N Dynamics, and Profit Margins
. (Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/10191
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
DeBruyn, Amanda. “Plant Density, Harvest Date, and Fertilizer Impact on Sugarbeet (Beta vulgaris L.) Root and Sucrose Yield, N Dynamics, and Profit Margins
.” 2017. Thesis, University of Guelph. Accessed December 05, 2019.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/10191.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
DeBruyn, Amanda. “Plant Density, Harvest Date, and Fertilizer Impact on Sugarbeet (Beta vulgaris L.) Root and Sucrose Yield, N Dynamics, and Profit Margins
.” 2017. Web. 05 Dec 2019.
Vancouver:
DeBruyn A. Plant Density, Harvest Date, and Fertilizer Impact on Sugarbeet (Beta vulgaris L.) Root and Sucrose Yield, N Dynamics, and Profit Margins
. [Internet] [Thesis]. University of Guelph; 2017. [cited 2019 Dec 05].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/10191.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
DeBruyn A. Plant Density, Harvest Date, and Fertilizer Impact on Sugarbeet (Beta vulgaris L.) Root and Sucrose Yield, N Dynamics, and Profit Margins
. [Thesis]. University of Guelph; 2017. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/10191
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Florida
29.
Shurberg, Gitta.
Validating Nitrogen Requirements for Florida Landscape Plants.
Degree: MS, Horticultural Science - Environmental Horticulture, 2010, University of Florida
URL: http://ufdc.ufl.edu/UFE0042612
► The basis for current nitrogen (N) fertilizer recommendations for ornamental plants in Florida is unclear. Much of the research that exists was performed on trees…
(more)
▼ The basis for current
nitrogen (N)
fertilizer recommendations for ornamental plants in Florida is unclear. Much of the research that exists was performed on trees and shrubs, which may have different fertilization requirements than perennials, annuals, vines and groundcovers. Therefore, the current
fertilizer recommendations need to be validated for these additional plant types. Knowledge of specific
fertilizer requirements will allow for zoning of plants within the landscape based on their N
fertilizer requirements, which should result in more efficient
fertilizer application, thereby reducing the potential for nutrient losses (e.g., runoff, leaching, and volatilization) to the environment. Trials were conducted at The University of Florida -Institute of Food and Agricultural Sciences (UF-IFAS) Gulf Coast Research and Education Center (GCREC) in Wimauma, FL. Plots were 10 feet by 40 feet raised beds filled with soil from a subsurface horizon that is commonly used in central Florida for construction areas as fill . Drip irrigation was applied as needed. No mulch was added to beds in order to minimize outside N contributions.
Nitrogen fertilizer requirements were determined for the following warm season bedding plant species: Golden Globe melampodium (Melampodium divericatum), Cora White vinca (Catharanthus roseus), and Profusion Cherry zinnia (Zinnia elegans); cool season bedding plant species: Montego Yellow snapdragon (Antirrhinum majus), Telstar Crimson dianthus (Dianthus chinensis), and Delta Pure Violet pansy (Viola timeswittrockiana); dicot perennial species: New Gold lantana (Lantana timeshybrida), Mystic Spires Salvia salvia (Salvia longispicata timesfarinacea) and bush daisy (Gamolepis chrysanthemoides); and monocot perennial species: Evergreen giant liriope (Liriope muscari) and White Christmas caladium (Caladium bicolor). Annual and perennial plant species were selected based on anecdotal evidence of high, moderate, and low fertilization needs for evaluation across a range of N fertilization regimes. The plants were fertilized every six weeks at five different N rates using a slow-release
fertilizer based on current recommendations for ornamental plants growing in the landscape in Florida: 0, 2, 4, 6, and 12 lb/1000 square ft per yr (0.0, 9.8, 19.6, 29.4, and 58.8 g/square m per yr). Plant growth, aesthetic quality ratings, chlorophyll measurements, and flower cover index (second year only) were determined for all plant species at six-week intervals.
Nitrogen fertilizer requirements were determined for each species based on these plant measurements.Based on the results of our study, most of the plant species required N
fertilizer at rates that were within the range of N rates recommended by the Florida-Friendly Landscaping Program. However, plant response (growth, quality, chlorophyll, etc.) was more specific between evaluated species than the existing N
fertilizer recommendations. More research is necessary to determine if recommended N rates need to be modified for species that did not perform well…
Advisors/Committee Members: Denny, Geoffrey (committee chair), Knox, Gary W. (committee member), Shober, Amy L. (committee member).
Subjects/Keywords: Annuals; Fertilization; Fertilizers; Flowers; Nitrogen; Nitrogen fertilizers; Nutrients; Plant growth; Planting; Plants; annuals, fertilizer, growth, landscape, nitrogen, ornamentals, perrenials, spad
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APA ·
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APA (6th Edition):
Shurberg, G. (2010). Validating Nitrogen Requirements for Florida Landscape Plants. (Masters Thesis). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0042612
Chicago Manual of Style (16th Edition):
Shurberg, Gitta. “Validating Nitrogen Requirements for Florida Landscape Plants.” 2010. Masters Thesis, University of Florida. Accessed December 05, 2019.
http://ufdc.ufl.edu/UFE0042612.
MLA Handbook (7th Edition):
Shurberg, Gitta. “Validating Nitrogen Requirements for Florida Landscape Plants.” 2010. Web. 05 Dec 2019.
Vancouver:
Shurberg G. Validating Nitrogen Requirements for Florida Landscape Plants. [Internet] [Masters thesis]. University of Florida; 2010. [cited 2019 Dec 05].
Available from: http://ufdc.ufl.edu/UFE0042612.
Council of Science Editors:
Shurberg G. Validating Nitrogen Requirements for Florida Landscape Plants. [Masters Thesis]. University of Florida; 2010. Available from: http://ufdc.ufl.edu/UFE0042612
Brigham Young University
30.
Buss, Jessica Chelise.
Polymer Coated Urea in Kentucky Bluegrass.
Degree: MS, 2016, Brigham Young University
URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=6668&context=etd
► Nitrogen (N) is the most commonly over-applied nutrient in urban environments because of the large visual and growth increases. This over-application has led to an…
(more)
▼ Nitrogen (N) is the most commonly over-applied nutrient in urban environments because of the large visual and growth increases. This over-application has led to an increase in the loss of N gas in the forms of ammonia and nitrous oxide, as well as an increase in nitrate leaching to surface and groundwater. Furthermore, excess N results in increased maintenance costs and landfill volume due to increased shoot growth from mowed clipping removal. Polymer coated urea (PCU) has proven to be an excellent source to these losses of N to the environment, but rate and timing parameters need study. A two-year field study, on sand and sandy loam soils in Provo, UT, was initiated in April 2014. Seven fertilized treatments included: urea split applied monthly; a single application of PCU (Agrium One Ap) applied in spring, a single PCU application in fall; two evenly split applications in spring and late summer; and three evenly split applications in spring, late summer, and late fall. These were compared to an untreated control. In addition the two application of PCU also had reduced rates of half and three-quarters, in addition to the full rate. Height and verdure measurements were taken on a weekly basis, along with periodic visual and biomass readings. All fertilized treatments resulted in a significant response to N as compared to the control. The single annual application treatments had significantly greater shoot growth during the weeks immediately after application and a significant reduction in verdure months later and, therefore, were unacceptable for consumer recommendation. Two applications of PCU, either at the three-quarter or full rates, were nearly identical in all measurements as compared to the spoon feeding of urea applied monthly. The half rate of two applications showed signs of inadequate N. Three applications of PCU was identical to two and, therefore, not recommended. This study shows two applications of PCU at the three-quarter rate is equally effective as spoon feeding the N. Doing so would result in less labor for fertilization. Further work is needed to evaluate other timing approaches for a single annual application, as well as long term effects of a reduced rate of N.
Subjects/Keywords: polymer coated urea PCU; urea; Kentucky bluegrass; Poa pratensis; nitrogen fertilizer; nitrogen timing; nitrogen rate; Plant Sciences
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APA (6th Edition):
Buss, J. C. (2016). Polymer Coated Urea in Kentucky Bluegrass. (Masters Thesis). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=6668&context=etd
Chicago Manual of Style (16th Edition):
Buss, Jessica Chelise. “Polymer Coated Urea in Kentucky Bluegrass.” 2016. Masters Thesis, Brigham Young University. Accessed December 05, 2019.
https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=6668&context=etd.
MLA Handbook (7th Edition):
Buss, Jessica Chelise. “Polymer Coated Urea in Kentucky Bluegrass.” 2016. Web. 05 Dec 2019.
Vancouver:
Buss JC. Polymer Coated Urea in Kentucky Bluegrass. [Internet] [Masters thesis]. Brigham Young University; 2016. [cited 2019 Dec 05].
Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=6668&context=etd.
Council of Science Editors:
Buss JC. Polymer Coated Urea in Kentucky Bluegrass. [Masters Thesis]. Brigham Young University; 2016. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=6668&context=etd
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