subject:(nitrogen uptake)

Oklahoma State University

1. Macnack, Natasha Elizabeth. In Season Prediction of Nitrogen Use Efficiency and Grain Protein in Winter Wheat (Triticum Aestivum L.).

Degree: Department of Plant and Soil Sciences, 2012, Oklahoma State University

URL: http://hdl.handle.net/11244/9341

► The algorithm currently used at Oklahoma State University for mid-season fertilizer nitrogen (N) recommendations utilizes an assumed nitrogen use efficiency (NUE) of 0.5. The recommended… (more)

Subjects/Keywords: grain protein; nitrogen uptake; nitrogen use efficiency

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Macnack, N. E. (2012). In Season Prediction of Nitrogen Use Efficiency and Grain Protein in Winter Wheat (Triticum Aestivum L.). (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/9341

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Macnack, Natasha Elizabeth. “In Season Prediction of Nitrogen Use Efficiency and Grain Protein in Winter Wheat (Triticum Aestivum L.).” 2012. Thesis, Oklahoma State University. Accessed April 13, 2021. http://hdl.handle.net/11244/9341.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Macnack, Natasha Elizabeth. “In Season Prediction of Nitrogen Use Efficiency and Grain Protein in Winter Wheat (Triticum Aestivum L.).” 2012. Web. 13 Apr 2021.

Vancouver:

Macnack NE. In Season Prediction of Nitrogen Use Efficiency and Grain Protein in Winter Wheat (Triticum Aestivum L.). [Internet] [Thesis]. Oklahoma State University; 2012. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/11244/9341.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Macnack NE. In Season Prediction of Nitrogen Use Efficiency and Grain Protein in Winter Wheat (Triticum Aestivum L.). [Thesis]. Oklahoma State University; 2012. Available from: http://hdl.handle.net/11244/9341

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Adelaide

2. Sabermanesh, Kasra. The responses of maize roots to nitrogen supply.

Degree: 2014, University of Adelaide

URL: http://hdl.handle.net/2440/102886

► Substantial quantities of costly nitrogen (N) fertilisers are applied to cereal crops each year to maximise yields, but only approximately half of the N is… (more)

▼ Substantial quantities of costly nitrogen (N) fertilisers are applied to cereal crops each year to maximise yields, but only approximately half of the N is captured by cereals, providing scope to increase root N uptake. However, our understanding of how the nitrate (NO₃⁻) uptake system is regulated and how it could be improved is limited. Furthermore, the changes to root morphology in response to NO₃⁻ supply are not well understood, in this case due to the difficulties associated with phenotyping roots in soil. To investigate how the NO₃⁻ uptake system is up-regulated, maize (Zea mays var. B73 and Mo17) was grown hydroponically with low or sufficient NO₃⁻ supply, and a range of physiological parameters associated with NO₃⁻ uptake were measured across the transition from seed N use, to external N capture. This transition provides an ideal system to clarify how the NO₃⁻ uptake system up-regulates as this is when plants first rely on increasing root N capture to meet demand. Across both lines and treatments, concentrations of shoot N and free amino acids in roots and shoots rapidly decrease as seed N reserves exhaust. Once free amino acid concentrations decrease to a critical level, root NO₃⁻ uptake capacity rapidly increased, corresponding with a rise in transcript levels of putative NO₃⁻ transporter genes ZmNRT2.1 and ZmNRT2.2. As NO₃⁻ uptake capacity reached maximum levels, shoot N concentrations stabilised. Despite shoot N concentrations stabilising, B73 was unable to maintain net N uptake and shoot growth in low NO₃⁻, relative to sufficient NO₃⁻. Conversely, Mo17 maintained shoot growth and net N uptake, and increased root mass in low NO₃⁻ relative to sufficient NO₃⁻. The effects of NO₃⁻ limitation on growth were reflected by an increased root:shoot, which emerged just prior to shoot N concentrations stabilising. In order to understand how root morphology may reflect the NO₃⁻ treatments differences observed in growth and net N uptake, morphological root traits were quantified across seedling development. Analysis showed that although B73 achieved greater absorption area per unit root mass than Mo17, its morphology was unresponsive to NO₃⁻ supply. Conversely, Mo17 responded to NO₃⁻ limitation by increasing lateral and axial root length before increasing root mass or volume. Subsequently, 11 putative quantitative trait loci (QTL) associated with morphological root traits corresponding with shoot growth or N uptake were detected across low and sufficient NO₃⁻, with one major QTL for lateral root length and surface area being identified in low NO₃⁻ on chromosome 5. These results provide insight into the processes involved in up-regulating root NO₃⁻ uptake capacity and how root morphology can adapt to NO₃⁻ supply. These findings identify potential control points in the regulation of NO₃⁻ uptake capacity and root morphology, which may be investigated further via global transcriptional analysis or fine-mapping of identified QTL respectively. Ultimately, this work may lead to identification of candidate regulatory genes… Advisors/Committee Members: Heuer, Sigrid (advisor), Garnett, Trevor Paul (advisor), Plett, Darren Craig (advisor), Tester, Mark Alfred (advisor), School of Agriculture, Food and Wine (school).

Subjects/Keywords: maize; root; seedlings; nitrogen; nitrate; NRT; uptake

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sabermanesh, K. (2014). The responses of maize roots to nitrogen supply. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/102886

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sabermanesh, Kasra. “The responses of maize roots to nitrogen supply.” 2014. Thesis, University of Adelaide. Accessed April 13, 2021. http://hdl.handle.net/2440/102886.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sabermanesh, Kasra. “The responses of maize roots to nitrogen supply.” 2014. Web. 13 Apr 2021.

Vancouver:

Sabermanesh K. The responses of maize roots to nitrogen supply. [Internet] [Thesis]. University of Adelaide; 2014. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/2440/102886.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sabermanesh K. The responses of maize roots to nitrogen supply. [Thesis]. University of Adelaide; 2014. Available from: http://hdl.handle.net/2440/102886

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Minnesota

3. Guentzel, Kristopher Steven. Measurement and modeling of denitrification in sand-bed streams of varying land use.

Degree: MS, Civil Engineering, 2013, University of Minnesota

URL: http://hdl.handle.net/11299/162828

► Processes that govern transport and transformation of aquatic nitrogen are of growing importance due to increases in anthropogenic nitrogen input from fertilizer application and fossil… (more)

▼ Processes that govern transport and transformation of aquatic nitrogen are of growing importance due to increases in anthropogenic nitrogen input from fertilizer application and fossil fuel combustion. Denitrification, the incremental reduction of soluble nitrate to gaseous end products, is the main pathway in which nitrogen is biologically removed from aquatic ecosystems. In this study denitrification is measured from sediment cores in five streams in central Minnesota, USA, using denitrification enzyme activity (DEA) assays as well as microbiological techniques including the amplification of nirS gene fragments through qPCR. Hydraulic and environmental variables are measured in the vicinity of the sediment cores to determine a possible mediating influence of fluid flow and chemical variables on denitrification activity. Denitrification rates measured using DEA analysis with amended nutrients ranged from 0.02-10.1 mg-N m-2 hr-1. Denitrification rates measured without amended nutrients were a factor of 5.35 less on average and ranged from 0.03-0.98 mg-N m-2 hr-1. The abundance of the denitrifier gene nirS was positively correlated with denitrification potential measurements (R2 = 0.79, P < 0.001) for most of the streams studied. NirS distribution in one of the sites, a field scale experimental stream called the Outdoor StreamLab, followed the spatial distribution of benthic organic matter closely along the sediment bed and through the sediment column. Predictive models to determine nitrate uptake via denitrification were derived from hydraulic, morphologic and water quality variables. The first used hydraulic data collected over three summers in the Outdoor StreamLab. A Gaussian-type function was fit to these data and was dependent on fluid flow and channel characteristics within the stream system. The second model was derived following dimensional analysis on data from the Outdoor StreamLab and four other natural streams of varying watershed and in-stream conditions. This predictive model integrated not only stream hydraulic data but also environmental, morphological and DEA measurements for nutrient-amended and unamended samples. The proposed model explained 75% and 60% of the variability in amended and unamended DEA rates, respectively. Results from this study verify that denitrification is ubiquitous across varying stream systems but is most dependent on the distribution of sediment organic matter and interstitial pore space as well as stream hydraulic characteristics.

Subjects/Keywords: Bacteria; Denitrification; Modeling; Nitrate; Nitrogen; Uptake

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Guentzel, K. S. (2013). Measurement and modeling of denitrification in sand-bed streams of varying land use. (Masters Thesis). University of Minnesota. Retrieved from http://hdl.handle.net/11299/162828

Chicago Manual of Style (16^th Edition):

Guentzel, Kristopher Steven. “Measurement and modeling of denitrification in sand-bed streams of varying land use.” 2013. Masters Thesis, University of Minnesota. Accessed April 13, 2021. http://hdl.handle.net/11299/162828.

MLA Handbook (7^th Edition):

Guentzel, Kristopher Steven. “Measurement and modeling of denitrification in sand-bed streams of varying land use.” 2013. Web. 13 Apr 2021.

Vancouver:

Guentzel KS. Measurement and modeling of denitrification in sand-bed streams of varying land use. [Internet] [Masters thesis]. University of Minnesota; 2013. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/11299/162828.

Council of Science Editors:

Guentzel KS. Measurement and modeling of denitrification in sand-bed streams of varying land use. [Masters Thesis]. University of Minnesota; 2013. Available from: http://hdl.handle.net/11299/162828

4. Widner, Brittany. The Marine Cyanate Cycle.

Degree: PhD, Ocean/Earth/Atmos Sciences, 2016, Old Dominion University

URL: 9781369226195 ; https://digitalcommons.odu.edu/oeas_etds/1

► Cyanate (OCN-) is a reduced nitrogen compound with the potential to serve as a nitrogen and carbon source for marine microbes. Evidence from genomes… (more)

▼ Cyanate (OCN-) is a reduced nitrogen compound with the potential to serve as a nitrogen and carbon source for marine microbes. Evidence from genomes and culture studies indicated that several marine cyanobacterial groups, including representatives of the globally important genera Synechococcus and Prochlorococcus, might be capable of cyanate assimilation. However, prior to this study, the distribution, bioavailability, and production pathways of cyanate were unknown in natural systems due to the absence of a sensitive cyanate assay; and the ability of organisms to assimilate cyanate on relevant timescales was unknown because we lacked a suitable tracer for measuring uptake. I developed a cyanate assay to measure cyanate concentrations in estuarine and seawater samples, and then measured distribution at sites in the coastal western temperate North Atlantic (NA) and eastern tropical South Pacific (ETSP) including the Oxygen Deficient Zone. Cyanate concentrations ranged from below the limit of detection (0.4 nM) to 65 nM in natural samples examined to date. Cyanate was produced photochemically and in senescent diatom cultures, but cyanate was not detectable in wet and dry offshore atmospheric deposition. Using a custom-synthesized 13C15N-labeled cyanate compound, I also measured rates of cyanate uptake by natural microbial communities in the NA and ETSP. Cyanate N uptake ranged from undetectable (< 0.02) to 13 nmol l-1 h-1 and was significantly higher than cyanate C uptake on all cruises. Cyanate N uptake was up to 10% of total measured N uptake at an offshore oligotrophic station in the NA but contributed a smaller fraction of total measured N uptake (< 2%) at coastal stations in the NA and ETSP. The results of this dissertation indicate that: 1) cyanate concentrations are measureable in the marine environment and cyanate has a biological-like distribution in marine systems; 2) cyanate is taken up in surface waters, probably by phytoplankton; 3) cyanate is produced photochemically in sunlit waters and from degradation of organic matter throughout the water column or through direct release by phytoplankton; and 4) cyanate is consumed in the mesopelagic region probably by either conversion to ammonium and then to nitrate or by cyanate-supported anaerobic ammonium oxidation (cyanammox) in oxygen deficient waters. Advisors/Committee Members: Margaret R. Mulholland, Kenneth Mopper, Anton F. Post, Lesley H. Greene.

Subjects/Keywords: Cyanate; Marine nitrogen; Nitrogen uptake; Photochemistry; Analytical Chemistry; Biogeochemistry; Oceanography

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Widner, B. (2016). The Marine Cyanate Cycle. (Doctoral Dissertation). Old Dominion University. Retrieved from 9781369226195 ; https://digitalcommons.odu.edu/oeas_etds/1

Chicago Manual of Style (16^th Edition):

Widner, Brittany. “The Marine Cyanate Cycle.” 2016. Doctoral Dissertation, Old Dominion University. Accessed April 13, 2021. 9781369226195 ; https://digitalcommons.odu.edu/oeas_etds/1.

MLA Handbook (7^th Edition):

Widner, Brittany. “The Marine Cyanate Cycle.” 2016. Web. 13 Apr 2021.

Vancouver:

Widner B. The Marine Cyanate Cycle. [Internet] [Doctoral dissertation]. Old Dominion University; 2016. [cited 2021 Apr 13]. Available from: 9781369226195 ; https://digitalcommons.odu.edu/oeas_etds/1.

Council of Science Editors:

Widner B. The Marine Cyanate Cycle. [Doctoral Dissertation]. Old Dominion University; 2016. Available from: 9781369226195 ; https://digitalcommons.odu.edu/oeas_etds/1

Oklahoma State University

5. Waldschmidt, Kevin. Effects of Plant Population and Nitrogen Rate on Spectral Properties and Grain Yield of Winter Wheat (Triticum aestivum L.).

Degree: Department of Plant and Soil Sciences, 2011, Oklahoma State University

URL: http://hdl.handle.net/11244/9380

► Predicted grain yields enable producers to more accurately apply the needed top-dress nitrogen (N) which leads to improved N use efficiencies and increased profit. This… (more)

Subjects/Keywords: ndvi; nitrogen rate; nitrogen uptake; seeding rate; tiller density; wheat

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Waldschmidt, K. (2011). Effects of Plant Population and Nitrogen Rate on Spectral Properties and Grain Yield of Winter Wheat (Triticum aestivum L.). (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/9380

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Waldschmidt, Kevin. “Effects of Plant Population and Nitrogen Rate on Spectral Properties and Grain Yield of Winter Wheat (Triticum aestivum L.).” 2011. Thesis, Oklahoma State University. Accessed April 13, 2021. http://hdl.handle.net/11244/9380.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Waldschmidt, Kevin. “Effects of Plant Population and Nitrogen Rate on Spectral Properties and Grain Yield of Winter Wheat (Triticum aestivum L.).” 2011. Web. 13 Apr 2021.

Vancouver:

Waldschmidt K. Effects of Plant Population and Nitrogen Rate on Spectral Properties and Grain Yield of Winter Wheat (Triticum aestivum L.). [Internet] [Thesis]. Oklahoma State University; 2011. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/11244/9380.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Waldschmidt K. Effects of Plant Population and Nitrogen Rate on Spectral Properties and Grain Yield of Winter Wheat (Triticum aestivum L.). [Thesis]. Oklahoma State University; 2011. Available from: http://hdl.handle.net/11244/9380

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Minnesota

6. Jones, Colin R. Nitrogen Use Efficiency of Potato.

Degree: MS, Applied Plant Sciences, 2019, University of Minnesota

URL: http://hdl.handle.net/11299/206167

► Potato (Solanum tuberosum) production typically occurs on sandy soils with only 40-60% of the applied nitrogen (N) acquired by the crop. Nitrogen fertilization rates in… (more)

Subjects/Keywords: Nitrogen Uptake Efficiency; Nitrogen Use Efficiency; Nitrogen Utilization Efficiency; NUE; Potato; potato root

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jones, C. R. (2019). Nitrogen Use Efficiency of Potato. (Masters Thesis). University of Minnesota. Retrieved from http://hdl.handle.net/11299/206167

Chicago Manual of Style (16^th Edition):

Jones, Colin R. “Nitrogen Use Efficiency of Potato.” 2019. Masters Thesis, University of Minnesota. Accessed April 13, 2021. http://hdl.handle.net/11299/206167.

MLA Handbook (7^th Edition):

Jones, Colin R. “Nitrogen Use Efficiency of Potato.” 2019. Web. 13 Apr 2021.

Vancouver:

Jones CR. Nitrogen Use Efficiency of Potato. [Internet] [Masters thesis]. University of Minnesota; 2019. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/11299/206167.

Council of Science Editors:

Jones CR. Nitrogen Use Efficiency of Potato. [Masters Thesis]. University of Minnesota; 2019. Available from: http://hdl.handle.net/11299/206167

University of Edinburgh

7. Nair, Richard Kiran Francis. Using stable isotopes to investigate interactions between the forest carbon and nitrogen cycles.

Degree: PhD, 2015, University of Edinburgh

URL: http://hdl.handle.net/1842/10573

► Nitrogen (N) fertilization due to atmospheric deposition (NDEP ) may explain some of the net carbon (C) sink (0.6-0.7 Pg y-1) in temperate forests, but… (more)

▼ Nitrogen (N) fertilization due to atmospheric deposition (NDEP ) may explain some of the net carbon (C) sink (0.6-0.7 Pg y-1) in temperate forests, but estimates of the additional C uptake due to atmospheric N additions (∆C/∆N) can vary by over an order of magnitude (5 to 200 ∆C/∆N). High estimates from several recent studies [e.g. Magnani (2007), Nature 447 848-850], deriving ∆C/∆N from regional correlations between NDEP and measures of C uptake (such as eddy covariance -derived net ecosystem production, or forest inventory data) contradict estimates from other studies, particularly those involving 15N tracer applications added as fertilizer to the forest floor. A strong ∆C/∆N effect requires nitrogen to be efficiently acquired by trees and allocated to high C:N, long-lived woody tissues, but these isotope experiments typically report relatively little (~ 20 %) of 15N added is found above-ground, with less than 5 % of the total 15N applied found in wood. Consequently the high correlation-derived ∆C/∆N estimates are often attributed to co-variation with other factors across the range of sites investigated. However, 15N-fertilization treatments often impose considerably higher total N loads than ambient NDEP , while almost all exclusively only apply mineral 15N treatments to the soil, often in a limited number of treatment events over relatively short periods of time. Excessive N deposition loads can induce negative physiological effects and limit the resulting ∆C/∆N observed, and applying treatments to the soil ignores canopy nitrogen uptake, which has been demonstrated in numerous studies. As canopies can directly take up nitrogen, the chronic, (relatively) low levels of ambient NDEP inputs from pollution may be acquired without some of the effects of heavy N loads, with trees obtaining this N before it reaches the soil, allowing canopies to substitute for, or supplement, edaphic N nutrition. The strength of this effect depends on how much N uptake can occur across the canopy under field conditions, and if this extra N supplies growth in woody tissues such as the stem, as well as the canopy. Similarly, such mineral fertilizer isotope trace experiments are also unable to trace N in the decomposing litter and humus layers of the soil, which even under heavy NDEP loading contribute most of the N utilised for forest growth. Recent literature suggests that some organic (early decomposition) forms of N may be taken up by roots. If this litter N is not retained or distributed in the same way as mineral fertilizers, its contribution to plant nutrition and ∆C/∆N may need to be reassessed under nitrogen deposition. We tested some of these assumptions in the nursery and the field. In order to facilitate litter 15N tracing, we conducted an experiment injecting large trees with 15N-NH4NO3 to create 15N-labelled litter, tracing the applied isotope into a full harvest of the canopy. Such labelled litter substitute was used to replace the litter layer in a Sitka Spruce plantation (Picea sitchensis L. (Bong.)), where the fate of…

Subjects/Keywords: 631.8; nitrogen deposition; Sitka spruce; canopy; nitrogen uptake; stem injection; litter nitrogen; carbon sequestration

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nair, R. K. F. (2015). Using stable isotopes to investigate interactions between the forest carbon and nitrogen cycles. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/10573

Chicago Manual of Style (16^th Edition):

Nair, Richard Kiran Francis. “Using stable isotopes to investigate interactions between the forest carbon and nitrogen cycles.” 2015. Doctoral Dissertation, University of Edinburgh. Accessed April 13, 2021. http://hdl.handle.net/1842/10573.

MLA Handbook (7^th Edition):

Nair, Richard Kiran Francis. “Using stable isotopes to investigate interactions between the forest carbon and nitrogen cycles.” 2015. Web. 13 Apr 2021.

Vancouver:

Nair RKF. Using stable isotopes to investigate interactions between the forest carbon and nitrogen cycles. [Internet] [Doctoral dissertation]. University of Edinburgh; 2015. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/1842/10573.

Council of Science Editors:

Nair RKF. Using stable isotopes to investigate interactions between the forest carbon and nitrogen cycles. [Doctoral Dissertation]. University of Edinburgh; 2015. Available from: http://hdl.handle.net/1842/10573

University of Adelaide

8. Muschietti Piana, Maria del Pilar. Managing crop residues and nitrogen fertiliser to improve wheat yield potential in water-limited environments.

Degree: 2020, University of Adelaide

URL: http://hdl.handle.net/2440/129872

► Nitrogen (N) supply to rain-fed crops is becoming increasingly challenging due to the decline in organic N reserves. In low-rainfall wheat cropping systems, low crop… (more)

▼ Nitrogen (N) supply to rain-fed crops is becoming increasingly challenging due to the decline in organic N reserves. In low-rainfall wheat cropping systems, low crop N uptake has been linked to asynchrony in soil N supply through mineralisation. This is especially true on sandy soils of south eastern Australia which have a low N supply capacity and are considered highly ‘risky’ in a management context. When the N released from soil and residues is insufficient, and/or the timing of biological supply is not well matched with crop demand, management of N inputs to the soil (i.e. legume residue addition and/or fertiliser N) is essential to achieve yield potential and to return a neutral soil N balance for environmental sustainability. The general aim of this thesis was to improve our understanding of the seasonal pattern of the soil N supply capacity via mineralisation for increased wheat N uptake and grain yield, by combining N inputs from different crop residues (removed, wheat or lupin) and fertiliser N inputs (nil, or low, or high N) in a low-rainfall sandy soil environment. Field experiments were conducted over 2 years (2015-2016) at low-rainfall Kandosols based on-farm in the Mallee environment of South Australia. The temporal patterns of the soil profile mineral N and plant available water to 100 cm depth, wheat aerial biomass and N uptake were measured in both years (Chapter 2). In 2016 we also measured the disease incidence as a key environmental variable. There was 35 kg ha⁻¹ more soil mineral N to 100 cm depth following lupin compared with wheat residues at the end of the fallow in both years. In a below average rainfall season (Decile 4), wheat biomass produced on lupin residues was responsive to fertiliser N input with soil profile mineral N depleted by increased crop N uptake early in the season. In an above average rainfall season (Decile 9), a higher soil mineral N supply increased actual and potential grain yield, total biomass, N uptake, harvest index and water use efficiency of wheat, regardless of the source of N (legume N/fertiliser N). These experiments showed that the combination of lupin residues with N fertiliser application increased soil profile mineral N at early growth stages, providing a greater soil N supply at the time of high wheat N demand, and the inclusion of a legume in the rotation is critical for improving the N supply to wheat, with added disease break benefits (Chapter 2). The 2016 field experiment involved the quantification of decomposition rates and N release from wheat and lupin residues over the fallow and the subsequent wheat crop growing season with and without fertiliser N application. It also involved measurements of the temporal patterns of the surface soil mineral N, potentially mineralisable N, microbial biomass N, dissolved organic N and with temperature and rainfall as key environmental variables in all treatments (Chapter 3). Residue decomposition and N release over the fallow and the wheat growing season was measured in the field using litterbags with wheat or… Advisors/Committee Members: McBeath, Therese (advisor), McNeill, Ann (advisor), Vadakattu, Gupta (advisor), Cipriotti, Pablo Ariel (advisor), School of Agriculture, Food and Wine (school).

Subjects/Keywords: Legumes; nitrogen mineralisation; wheat nitrogen uptake; nitrogen supply; sandy soils; semi-arid environments

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Muschietti Piana, M. d. P. (2020). Managing crop residues and nitrogen fertiliser to improve wheat yield potential in water-limited environments. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/129872

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Muschietti Piana, Maria del Pilar. “Managing crop residues and nitrogen fertiliser to improve wheat yield potential in water-limited environments.” 2020. Thesis, University of Adelaide. Accessed April 13, 2021. http://hdl.handle.net/2440/129872.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Muschietti Piana, Maria del Pilar. “Managing crop residues and nitrogen fertiliser to improve wheat yield potential in water-limited environments.” 2020. Web. 13 Apr 2021.

Vancouver:

Muschietti Piana MdP. Managing crop residues and nitrogen fertiliser to improve wheat yield potential in water-limited environments. [Internet] [Thesis]. University of Adelaide; 2020. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/2440/129872.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Muschietti Piana MdP. Managing crop residues and nitrogen fertiliser to improve wheat yield potential in water-limited environments. [Thesis]. University of Adelaide; 2020. Available from: http://hdl.handle.net/2440/129872

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Swedish University of Agricultural Sciences

9. Svennerstam, Henrik. Amino acid uptake in Arabidopsis.

Degree: 2008, Swedish University of Agricultural Sciences

URL: http://pub.epsilon.slu.se/1794/

► Nitrogen (N) is essential for all living organisms and is considered to be the limiting factor for plant growth in many ecosystems. Although generally believed… (more)

▼ Nitrogen (N) is essential for all living organisms and is considered to be the limiting factor for plant growth in many ecosystems. Although generally believed to rely on mineral N to fulfill their N needs, plants have also been found to access organic N such as amino acids. Despite extensive research, the importance of amino acids as N sources for plants still remains unclear. The work presented in this thesis has focused on identifying the transporters responsible for amino acid uptake in plants and to characterize mutants lacking these transporters. Two transporters important for Arabidopsis thaliana amino acid uptake were identified, the lysine histidine transporter 1 (LHT1) and amino acid permease 5 (AAP5). These two transporters were found to have complementary, non-overlapping affinity spectra, i.e. LHT1 displayed affinity for neutral- and acidic amino acids and for L-Histidine, whereas AAP5 exhibited affinity for L-Arginine and L-Lysine only. Mutants lacking both LHT1 and AAP5 were found to have little residual uptake of the amino acids tested, suggesting these transporters to be the most important for Arabidopsis root amino acid uptake. Mutants lacking LHT1 or AAP5 displayed much reduced uptake rates in the low !M range suggesting these transporters mediate efficient uptake at field relevant concentrations. LHT1 mutants did not only have impaired uptake capacity, but also grew less than wild type when grown on for example L-Glutamine as the sole N source. In contrast, by over-expressing LHT1, plants grew larger on amino acids, suggesting a connection between uptake capacity and growth. Growth experiments using labeled amino acids in a mixture with nitrate revealed that a substantial amount of plant N was amino acid derived, suggesting that Arabidopsis has the ability to efficiently use amino acids as a source of N. The results presented in this thesis provide a mechanistic understanding to the process of root amino acid uptake in plants. This knowledge is important for future research within the field of plant organic N nutrition and Arabidopsis genotypes with altered amino acid uptake capacities can be used as tools to further elucidate the ecological benefit plants may have by taking up amino acids.

Subjects/Keywords: arabidopsis thaliana; nitrogen; amino acids; nutrient uptake; growth; Arabidopsis thaliana; LHT1; AAP5; nitrogen; amino acid; uptake; knockout; transporter.

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Svennerstam, H. (2008). Amino acid uptake in Arabidopsis. (Doctoral Dissertation). Swedish University of Agricultural Sciences. Retrieved from http://pub.epsilon.slu.se/1794/

Chicago Manual of Style (16^th Edition):

Svennerstam, Henrik. “Amino acid uptake in Arabidopsis.” 2008. Doctoral Dissertation, Swedish University of Agricultural Sciences. Accessed April 13, 2021. http://pub.epsilon.slu.se/1794/.

MLA Handbook (7^th Edition):

Svennerstam, Henrik. “Amino acid uptake in Arabidopsis.” 2008. Web. 13 Apr 2021.

Vancouver:

Svennerstam H. Amino acid uptake in Arabidopsis. [Internet] [Doctoral dissertation]. Swedish University of Agricultural Sciences; 2008. [cited 2021 Apr 13]. Available from: http://pub.epsilon.slu.se/1794/.

Council of Science Editors:

Svennerstam H. Amino acid uptake in Arabidopsis. [Doctoral Dissertation]. Swedish University of Agricultural Sciences; 2008. Available from: http://pub.epsilon.slu.se/1794/

10. 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

8 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th 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 April 13, 2021. http://hdl.handle.net/2097/38812.

MLA Handbook (7^th Edition):

Ortez, Osler Antonio Amador. “Study of nitrogen limitation and seed nitrogen sources for historical and modern genotypes in soybean.” 2018. Web. 13 Apr 2021.

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 2021 Apr 13]. 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 Kentucky

11. Hitz, Katlyn. Breeding for Nitrogen Use Efficiency in Soft Red Winter Wheat.

Degree: 2015, University of Kentucky

URL: https://uknowledge.uky.edu/pss_etds/62

► Nitrogen use efficient (NUE) wheat varieties have potential to reduce input costs for growers, limit N runoff into water ways, and increase wheat adaptability to… (more)

Subjects/Keywords: Winter wheat; nitrogen use efficiency; nitrogen uptake efficiency; nitrogen utilization efficiency; nitrogen stress; warming; Plant Breeding and Genetics

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hitz, K. (2015). Breeding for Nitrogen Use Efficiency in Soft Red Winter Wheat. (Masters Thesis). University of Kentucky. Retrieved from https://uknowledge.uky.edu/pss_etds/62

Chicago Manual of Style (16^th Edition):

Hitz, Katlyn. “Breeding for Nitrogen Use Efficiency in Soft Red Winter Wheat.” 2015. Masters Thesis, University of Kentucky. Accessed April 13, 2021. https://uknowledge.uky.edu/pss_etds/62.

MLA Handbook (7^th Edition):

Hitz, Katlyn. “Breeding for Nitrogen Use Efficiency in Soft Red Winter Wheat.” 2015. Web. 13 Apr 2021.

Vancouver:

Hitz K. Breeding for Nitrogen Use Efficiency in Soft Red Winter Wheat. [Internet] [Masters thesis]. University of Kentucky; 2015. [cited 2021 Apr 13]. Available from: https://uknowledge.uky.edu/pss_etds/62.

Council of Science Editors:

Hitz K. Breeding for Nitrogen Use Efficiency in Soft Red Winter Wheat. [Masters Thesis]. University of Kentucky; 2015. Available from: https://uknowledge.uky.edu/pss_etds/62

Universiteit Utrecht

12. Andersson, M.G.I. Nitrogen cycling in a turbid, tidal estuary.

Degree: 2007, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/25208

► In this thesis I investigated nitrification, dissolved inorganic and organic nitrogen uptake, and the relative importance of nitrification and ammonium assimilation. I have also investigated… (more)

▼ In this thesis I investigated nitrification, dissolved inorganic and organic nitrogen uptake, and the relative importance of nitrification and ammonium assimilation. I have also investigated exchange with marshes and sediments. Nitrification, oxidation of ammonium to nitrate is the first step for removal of nitrogen from a system. Evaluating a suitable method to quantify nitrification in estuarine systems was the subject of the first study. One method quantifying nitrification as nitrifier activity was compared to another method using growth of nitrifying bacteria in the Scheldt estuary over a salinity gradient. Measurements were made during 4 seasons using 15N enriched ammonium and 14C labeled carbon incorporation. Our study demonstrated that the conversion of growth rates to nitrifying activity induces uncertainty because activity and growth of nitrifiers may be uncoupled. Uptake of dissolved ammonium, nitrate, nitrite, urea and amino acids was the topic of the second study. It was studied in the Scheldt estuary during the same cruises mentioned above. Urea and amino acids constituted up to 43 and 29 % of total nitrogen uptake, respectively, and were of similar importance as inorganic substrates. In January, April and November amino acids constituted a source of both nitrogen and carbon while urea mainly constituted a source of carbon. During the summer months amino acids were used mainly as a source for nitrogen, while urea was a source for both carbon and nitrogen; urea was rarely used as nitrogen substrate alone. The subject of the third study was production of N2. Sediment nitrogen removal via production of N2, depends on a number of factors. This study showed that the interaction between two factors, temperature and nitrate concentration in the overlying water, governs benthic production of N2, whereas these factors separately have a minor effect. Increasing temperatures above ambient levels, both during winter and summer, caused the flux of ammonium out of the sediment to increase. After investigating the abiotic factors, temperature and nitrate concentration on N2 production, attention turned in the fourth study to biotic factors, such as macrofauna. We successfully defaunated the sediment of a tidal flat in situ and were able to follow the effect of recolonization on biogeochemical processes. The experiment did not last long enough for the sediment to return to natural conditions. Nevertheless, a strong effect of faunal community on biogeochemical processes were found. N2 production rates were up to 70 % lower in defaunated sediment compared to control sediment. The fifth study was a whole-ecosystem whole-ecosystem labelling experiment in a freshwater marsh. 15N-NH4+ was added to the floodwater entering a tidal marsh area, and marsh ammonium processing and retention were traced in six subsequent tide cycles. Data were presented for the water phase components of the marsh system, in which changes in concentration and isotopic enrichment of NO3-, NO2-, N2O, N2, NH4+ and suspended particulate…

Subjects/Keywords: Earth Sciences; nitrogen; estuary; Scheldt; nitrification; denitrification; nitrogen uptake; DON; stable isotopes; macrofauna; freshwater marsh

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Andersson, M. G. I. (2007). Nitrogen cycling in a turbid, tidal estuary. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/25208

Chicago Manual of Style (16^th Edition):

Andersson, M G I. “Nitrogen cycling in a turbid, tidal estuary.” 2007. Doctoral Dissertation, Universiteit Utrecht. Accessed April 13, 2021. http://dspace.library.uu.nl:8080/handle/1874/25208.

MLA Handbook (7^th Edition):

Andersson, M G I. “Nitrogen cycling in a turbid, tidal estuary.” 2007. Web. 13 Apr 2021.

Vancouver:

Andersson MGI. Nitrogen cycling in a turbid, tidal estuary. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2007. [cited 2021 Apr 13]. Available from: http://dspace.library.uu.nl:8080/handle/1874/25208.

Council of Science Editors:

Andersson MGI. Nitrogen cycling in a turbid, tidal estuary. [Doctoral Dissertation]. Universiteit Utrecht; 2007. Available from: http://dspace.library.uu.nl:8080/handle/1874/25208

Universiteit Utrecht

13. Andersson, M.G.I. Nitrogen cycling in a turbid, tidal estuary.

Degree: 2007, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/315470

► In this thesis I investigated nitrification, dissolved inorganic and organic nitrogen uptake, and the relative importance of nitrification and ammonium assimilation. I have also investigated… (more)

▼ In this thesis I investigated nitrification, dissolved inorganic and organic nitrogen uptake, and the relative importance of nitrification and ammonium assimilation. I have also investigated exchange with marshes and sediments. Nitrification, oxidation of ammonium to nitrate is the first step for removal of nitrogen from a system. Evaluating a suitable method to quantify nitrification in estuarine systems was the subject of the first study. One method quantifying nitrification as nitrifier activity was compared to another method using growth of nitrifying bacteria in the Scheldt estuary over a salinity gradient. Measurements were made during 4 seasons using 15N enriched ammonium and 14C labeled carbon incorporation. Our study demonstrated that the conversion of growth rates to nitrifying activity induces uncertainty because activity and growth of nitrifiers may be uncoupled. Uptake of dissolved ammonium, nitrate, nitrite, urea and amino acids was the topic of the second study. It was studied in the Scheldt estuary during the same cruises mentioned above. Urea and amino acids constituted up to 43 and 29 % of total nitrogen uptake, respectively, and were of similar importance as inorganic substrates. In January, April and November amino acids constituted a source of both nitrogen and carbon while urea mainly constituted a source of carbon. During the summer months amino acids were used mainly as a source for nitrogen, while urea was a source for both carbon and nitrogen; urea was rarely used as nitrogen substrate alone. The subject of the third study was production of N2. Sediment nitrogen removal via production of N2, depends on a number of factors. This study showed that the interaction between two factors, temperature and nitrate concentration in the overlying water, governs benthic production of N2, whereas these factors separately have a minor effect. Increasing temperatures above ambient levels, both during winter and summer, caused the flux of ammonium out of the sediment to increase. After investigating the abiotic factors, temperature and nitrate concentration on N2 production, attention turned in the fourth study to biotic factors, such as macrofauna. We successfully defaunated the sediment of a tidal flat in situ and were able to follow the effect of recolonization on biogeochemical processes. The experiment did not last long enough for the sediment to return to natural conditions. Nevertheless, a strong effect of faunal community on biogeochemical processes were found. N2 production rates were up to 70 % lower in defaunated sediment compared to control sediment. The fifth study was a whole-ecosystem whole-ecosystem labelling experiment in a freshwater marsh. 15N-NH4+ was added to the floodwater entering a tidal marsh area, and marsh ammonium processing and retention were traced in six subsequent tide cycles. Data were presented for the water phase components of the marsh system, in which changes in concentration and isotopic enrichment of NO3-, NO2-, N2O, N2, NH4+ and suspended particulate nitrogen were… Advisors/Committee Members: Heip, C.H.R., Middelburg, J.J..

Subjects/Keywords: nitrogen; estuary; Scheldt; nitrification; denitrification; nitrogen uptake; DON; stable isotopes; macrofauna; freshwater marsh

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Andersson, M. G. I. (2007). Nitrogen cycling in a turbid, tidal estuary. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/315470

Chicago Manual of Style (16^th Edition):

Andersson, M G I. “Nitrogen cycling in a turbid, tidal estuary.” 2007. Doctoral Dissertation, Universiteit Utrecht. Accessed April 13, 2021. http://dspace.library.uu.nl:8080/handle/1874/315470.

MLA Handbook (7^th Edition):

Andersson, M G I. “Nitrogen cycling in a turbid, tidal estuary.” 2007. Web. 13 Apr 2021.

Vancouver:

Andersson MGI. Nitrogen cycling in a turbid, tidal estuary. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2007. [cited 2021 Apr 13]. Available from: http://dspace.library.uu.nl:8080/handle/1874/315470.

Council of Science Editors:

Andersson MGI. Nitrogen cycling in a turbid, tidal estuary. [Doctoral Dissertation]. Universiteit Utrecht; 2007. Available from: http://dspace.library.uu.nl:8080/handle/1874/315470

University of KwaZulu-Natal

14. Yu, Ying Liang. Effects of biochar addition on soil nitrogen retention and vegetable uptake in intensive production systems, China.

Degree: 2017, University of KwaZulu-Natal

URL: https://researchspace.ukzn.ac.za/handle/10413/16782

► China has a limited area of cultivated land per capita and an increasing population. Maintaining a high crop yield is essential to meet the large… (more)

Subjects/Keywords: Vegetable production system.; Biochar addition.; Nitrogen uptake by plants.; Chinese vegetable production.; Excessive nitrogen fertilizer.

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yu, Y. L. (2017). Effects of biochar addition on soil nitrogen retention and vegetable uptake in intensive production systems, China. (Thesis). University of KwaZulu-Natal. Retrieved from https://researchspace.ukzn.ac.za/handle/10413/16782

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yu, Ying Liang. “Effects of biochar addition on soil nitrogen retention and vegetable uptake in intensive production systems, China.” 2017. Thesis, University of KwaZulu-Natal. Accessed April 13, 2021. https://researchspace.ukzn.ac.za/handle/10413/16782.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yu, Ying Liang. “Effects of biochar addition on soil nitrogen retention and vegetable uptake in intensive production systems, China.” 2017. Web. 13 Apr 2021.

Vancouver:

Yu YL. Effects of biochar addition on soil nitrogen retention and vegetable uptake in intensive production systems, China. [Internet] [Thesis]. University of KwaZulu-Natal; 2017. [cited 2021 Apr 13]. Available from: https://researchspace.ukzn.ac.za/handle/10413/16782.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yu YL. Effects of biochar addition on soil nitrogen retention and vegetable uptake in intensive production systems, China. [Thesis]. University of KwaZulu-Natal; 2017. Available from: https://researchspace.ukzn.ac.za/handle/10413/16782

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Washington State University

15. [No author]. NITROGEN UPTAKE AND CYCLING BY CANOLA, PEA, AND WHEAT: IMPLICATIONS FOR ROTATIONAL NITROGEN USE EFFICIENCY .

Degree: 2014, Washington State University

URL: http://hdl.handle.net/2376/5417

► The total soil N supply is often not factored into many N use efficiency (NUE) equations despite its high contribution to plant N nutrition and… (more)

▼ The total soil N supply is often not factored into many N use efficiency (NUE) equations despite its high contribution to plant N nutrition and degree of internal N cycling in soil. Greenhouse, laboratory, and field experiments were conducted to determine differences in soil N uptake and partitioning in wheat (Triticum aestivum L.), field pea (Pisum sativum L.), and canola (Brassica napus L.), and their effects on net N mineralization and N carryover in soil. Multiple nitrogen recovery indices were utilized to track N in the various systems, including the recovery of 15N fertilizer by crops, N uptake efficiency, available N uptake efficiency, apparent fertilizer N recovery, net N mineralization, apparent N mineralization, rotational NUE, rotational N uptake efficiency, and rotational N utilization efficiency. Results from the greenhouse study highlighted the importance of soil derived N supply, which was taken up proportionately more than fertilizer N. The laboratory experiment linked the partitioning of C and N into structural and soluble cell components to the net N immobilization potential of soil. Findings from the field study related the contribution of N carryover and residue N to the N availability of subsequent crops and to enhanced N uptake and recovery efficiencies. Multi-year N balances adequately captured effects of fertilization and inclusion of legumes on increased subsequent N availability and rotational N use efficiencies. Finally, a case study is presented, which examines the driving forces for canola adoption, key factors leading to adoption, and institutionalized programs and organizations that sustain the canola industry in Canada and Australia. Initial public investments in research and market development, competitive prices, and the release of high yielding adapted varieties with advanced agronomics were instrumental for the development of a viable canola industry. The results from these studies will inform Washington growers of agronomic, ecological, social, economic, and political considerations when introducing canola production into wheat-based cropping systems. Advisors/Committee Members: Pan, William L (advisor).

Subjects/Keywords: Soil sciences; Agronomy; N carryover; Nitrogen uptake efficiency; Nitrogen use efficiency; N mineralization; Rotational NUE

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

author], [. (2014). NITROGEN UPTAKE AND CYCLING BY CANOLA, PEA, AND WHEAT: IMPLICATIONS FOR ROTATIONAL NITROGEN USE EFFICIENCY . (Thesis). Washington State University. Retrieved from http://hdl.handle.net/2376/5417

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

author], [No. “NITROGEN UPTAKE AND CYCLING BY CANOLA, PEA, AND WHEAT: IMPLICATIONS FOR ROTATIONAL NITROGEN USE EFFICIENCY .” 2014. Thesis, Washington State University. Accessed April 13, 2021. http://hdl.handle.net/2376/5417.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

author], [No. “NITROGEN UPTAKE AND CYCLING BY CANOLA, PEA, AND WHEAT: IMPLICATIONS FOR ROTATIONAL NITROGEN USE EFFICIENCY .” 2014. Web. 13 Apr 2021.

Vancouver:

author] [. NITROGEN UPTAKE AND CYCLING BY CANOLA, PEA, AND WHEAT: IMPLICATIONS FOR ROTATIONAL NITROGEN USE EFFICIENCY . [Internet] [Thesis]. Washington State University; 2014. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/2376/5417.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

author] [. NITROGEN UPTAKE AND CYCLING BY CANOLA, PEA, AND WHEAT: IMPLICATIONS FOR ROTATIONAL NITROGEN USE EFFICIENCY . [Thesis]. Washington State University; 2014. Available from: http://hdl.handle.net/2376/5417

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Edith Cowan University

16. Tarquinio, Flavia. The role of the seagrass leaf microbiome in assisting nitrogen uptake by the Western Australian seagrass, Posidonia sinuosa.

Degree: 2017, Edith Cowan University

URL: https://ro.ecu.edu.au/theses/2046

► Microorganisms play a key role in facilitating the cycling of several elements in coastal environments, including nitrogen (N). N is a key component for maintaining… (more)

▼ Microorganisms play a key role in facilitating the cycling of several elements in coastal environments, including nitrogen (N). N is a key component for maintaining high seagrass productivity and is often the limiting nutrient in marine environments. Seagrasses harbour an abundant and diverse microbial community (the ‘microbiome’), however their ecological and functional roles related to the seagrass host are still poorly understood, in particular regarding N cycling. Microorganisms capable of mineralising dissolved organic nitrogen (DON) may play a pivotal role in enhancing N availability in coastal environments such as seagrass meadows. Thus, the overall aim of my thesis was to enhance current understanding of abundance and diversity of the microbial community associated with seagrass meadows and their ecological role, with specific focus on N cycling. This was achieved by using molecular techniques together with 15N-enrichment experiments and nanoscale imaging techniques. Firstly, I reviewed the literature on the potential effects that microorganisms associated with both the above- and belowground seagrass tissue may have on plant fitness and the relevance of the seagrass microbiome and I have highlighted literature gaps. For my second chapter, I determined the abundance and community composition of bacteria and archaea associated with seagrass Posidonia sinuosa meadows in Marmion Marine Park, southwestern Australia. Data were collected from different seagrass meadows and meadow ‘microenvironments’, i.e. seagrass leaf surface, sediment and water column. I performed the quantitative polymerase chain reaction (q-PCR) targeting a series of bacterial and archaeal genes: 16S rRNA, ammonia oxidation genes (amoA) and genes involved in mineralisation of DON, via the urease enzyme (ureC). High-throughput sequencing was applied to 16S rRNA and amoA genes, to explore the diversity of these microbial assemblages related to P. sinuosa meadow microenvironments. Results from this chapter show that the P. sinuosa leaf biofilm represents a favourable habitat for microorganisms, as it hosts a significantly higher microbial abundance compared to the sediment and water. Moreover, 16S rRNA and amoA sequencing data indicate a high degree of compartmentalisation of functional microbial communities between the microenvironments of the seagrass meadow (leaf, sediment and water column), pointing towards the existence of a core seagrass leaf microbiome that could have specific interactions with the plant. For my third chapter I determined the role that microorganisms inhabiting P. sinuosa seagrass leaves may play in the recycling of DON, and subsequent transfer of inorganic N (DIN) into plant tissues. To achieve this, I performed an experiment whereby seagrass leaves with and without microorganisms were incubated with DO15N, and I traced the fine-scale uptake and assimilation of microbially processed N into seagrass cells, using nanoscale secondary ion mass spectrometry (NanoSIMS). Results from this chapter show for the first time that…

Subjects/Keywords: seagrass meadows; microbiome; nitrogen uptake; Posidonia sinuosa; dissolved organic nitrogen; Ecology and Evolutionary Biology

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tarquinio, F. (2017). The role of the seagrass leaf microbiome in assisting nitrogen uptake by the Western Australian seagrass, Posidonia sinuosa. (Thesis). Edith Cowan University. Retrieved from https://ro.ecu.edu.au/theses/2046

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tarquinio, Flavia. “The role of the seagrass leaf microbiome in assisting nitrogen uptake by the Western Australian seagrass, Posidonia sinuosa.” 2017. Thesis, Edith Cowan University. Accessed April 13, 2021. https://ro.ecu.edu.au/theses/2046.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tarquinio, Flavia. “The role of the seagrass leaf microbiome in assisting nitrogen uptake by the Western Australian seagrass, Posidonia sinuosa.” 2017. Web. 13 Apr 2021.

Vancouver:

Tarquinio F. The role of the seagrass leaf microbiome in assisting nitrogen uptake by the Western Australian seagrass, Posidonia sinuosa. [Internet] [Thesis]. Edith Cowan University; 2017. [cited 2021 Apr 13]. Available from: https://ro.ecu.edu.au/theses/2046.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tarquinio F. The role of the seagrass leaf microbiome in assisting nitrogen uptake by the Western Australian seagrass, Posidonia sinuosa. [Thesis]. Edith Cowan University; 2017. Available from: https://ro.ecu.edu.au/theses/2046

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Georgia

17. Helton, Ashley McKendree. An inter-biome comparison of stream network nitrate dynamics.

Degree: 2014, University of Georgia

URL: http://hdl.handle.net/10724/23398

► A simulation model of stream network NO3 dynamics was developed to scale up measurements of stream-reach NO3 uptake in seven catchments. The model explained NO3… (more)

Subjects/Keywords: nitrate; nitrogen; nutrient cycling; stream network; model; nitrogen uptake; inter-biome comparison

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Helton, A. M. (2014). An inter-biome comparison of stream network nitrate dynamics. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/23398

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Helton, Ashley McKendree. “An inter-biome comparison of stream network nitrate dynamics.” 2014. Thesis, University of Georgia. Accessed April 13, 2021. http://hdl.handle.net/10724/23398.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Helton, Ashley McKendree. “An inter-biome comparison of stream network nitrate dynamics.” 2014. Web. 13 Apr 2021.

Vancouver:

Helton AM. An inter-biome comparison of stream network nitrate dynamics. [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/10724/23398.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Helton AM. An inter-biome comparison of stream network nitrate dynamics. [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/23398

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

18. Xie, Jing 1987-. YIELD, NUTRIENT UPTAKE, NITROGEN FIXATION AND RELEASE BY SOYBEAN, PEA, AND LENTIL AND IMPACT ON FOLLOWING CROPS IN ROTATION IN SASKATCHEWAN, CANADA.

Degree: 2017, University of Saskatchewan

URL: http://hdl.handle.net/10388/7724

► As soybean acreage is expanding in western Canada, research is required to assess soybean production regarding the yield, nutrient uptake, N2 fixation, and the effects… (more)

▼ As soybean acreage is expanding in western Canada, research is required to assess soybean production regarding the yield, nutrient uptake, N2 fixation, and the effects on following crops under local soil-climatic conditions. Through a two-year rotation study conducted at four sites in the Black and Dark Brown soil zones in Saskatchewan, Canada, this research aimed to estimate the grain and straw yield, nutrient uptake, and N2 fixation of three short-season soybean varieties in comparison to three pea and three lentil varieties, and the effects on the yield, nutrient uptake, and residue N recovery by following wheat and canola crops grown on the stubble of soybean, pea, or lentil. Soil nutrient supply rates and greenhouse gas emissions as influenced by soybean, pea, and lentil residues were also estimated in this research. Soybean produced similar or higher grain yield (2512 kg ha-1) and nutrient uptake (112 kg N ha-1 and 14 kg P ha-1), and had similar effects on soil macro- and micronutrient availability to the following crops in comparison to pea and lentil. Lentil generally had lower grain yield yet similar rotational effects across the sites. Compared to pea and lentil, soybean had significantly higher K, Ca, Mg, and S concentrations in the grain across the sites, and similar or larger removal of these nutrient elements, suggesting potential for additional depletion of these elements from the soil over the long-term when soybean is grown. At maturity, soybean, pea, and lentil fixed similar amount of N in the above-ground plant components (grain + straw), with the majority (67-85%) of fixed N retained in the grain of soybean (119 kg N ha-1), pea (160 kg N ha-1), and lentil (89 kg N ha-1). Nitrogen derived from fixation comprised over 60% of the total above-ground N of the pulse crops. Soybean, pea, and lentil stubbles demonstrated similar effects on greenhouse gas emissions and soil N and P supplies measured under both field and controlled conditions. Overall, this research suggests promising prospects for soybean production under the soil-climatic conditions in the northern Great Plains, with considerations for soil P and K depletion in the long term when soybean is grown, although similar short-term effects on yield and nutrition of following crops were observed from soybean, pea, and lentil grown under similar conditions. Advisors/Committee Members: Schoenau, Jeff J., Bedard-Haughn, Angela K., Knight, J. Diane, Si, Bing, Warkentin, Thomas D..

Subjects/Keywords: Soybean; pea; lentil; nutrient uptake; nitrogen fixation; Saskatchewan

14 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Xie, J. 1. (2017). YIELD, NUTRIENT UPTAKE, NITROGEN FIXATION AND RELEASE BY SOYBEAN, PEA, AND LENTIL AND IMPACT ON FOLLOWING CROPS IN ROTATION IN SASKATCHEWAN, CANADA. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/7724

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Xie, Jing 1987-. “YIELD, NUTRIENT UPTAKE, NITROGEN FIXATION AND RELEASE BY SOYBEAN, PEA, AND LENTIL AND IMPACT ON FOLLOWING CROPS IN ROTATION IN SASKATCHEWAN, CANADA.” 2017. Thesis, University of Saskatchewan. Accessed April 13, 2021. http://hdl.handle.net/10388/7724.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Xie, Jing 1987-. “YIELD, NUTRIENT UPTAKE, NITROGEN FIXATION AND RELEASE BY SOYBEAN, PEA, AND LENTIL AND IMPACT ON FOLLOWING CROPS IN ROTATION IN SASKATCHEWAN, CANADA.” 2017. Web. 13 Apr 2021.

Vancouver:

Xie J1. YIELD, NUTRIENT UPTAKE, NITROGEN FIXATION AND RELEASE BY SOYBEAN, PEA, AND LENTIL AND IMPACT ON FOLLOWING CROPS IN ROTATION IN SASKATCHEWAN, CANADA. [Internet] [Thesis]. University of Saskatchewan; 2017. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/10388/7724.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Xie J1. YIELD, NUTRIENT UPTAKE, NITROGEN FIXATION AND RELEASE BY SOYBEAN, PEA, AND LENTIL AND IMPACT ON FOLLOWING CROPS IN ROTATION IN SASKATCHEWAN, CANADA. [Thesis]. University of Saskatchewan; 2017. Available from: http://hdl.handle.net/10388/7724

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Guelph

19. Orozco Gaeta, Maria Emilia. Relationship among nitrogen nutrition, photoperiod and photoperiodic injury in tomato (Solanum lycopersicum).

Degree: PhD, Department of Plant Agriculture, 2012, University of Guelph

URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/4050

► This thesis is an investigation of photoperiodic injury (PI) in tomato plants and practices to alleviate the problem. PI is a physiological disorder characterized by… (more)

▼ This thesis is an investigation of photoperiodic injury (PI) in tomato plants and practices to alleviate the problem. PI is a physiological disorder characterized by chlorosis and necrosis of leaves when plants are grown under either long photoperiods or non-24 h light/ dark cycles. Solanum lycopersicum L. (tomato) is particularly susceptible to PI. Our group has shown a correlation between PI and altered circadian expression patterns for the nitrate assimilatory enzymes nitrate reductase (NR) and nitrite reductase (NiR) in tomato, resulting in accumulation of the toxic metabolite nitrite, particularly at specific times of day (TOD) when the NiR/NR activity ratio is low. We hypothesized that accumulation of nitrite and PI can be alleviated by altering nitrate nutrition at specific times of day and the use of an air temperature differential. The tomato cultivars ‘Micro Tom’ (PI-tolerant) and ‘Basket Vee’ (PI-susceptible) were grown under various photoperiod regimes to determine: (1) if a positive correlation exists between PI and nitrite accumulation as determined by visual assessment, and chlorophyll and nitrite quantification; (2) if 24 h light affects the diel pattern of nitrate uptake in a way that favours PI through measurements of nitrate depletion; and (3) if PI can be alleviated by altering nitrate nutrition at two specific TOD when tomato is susceptible to nitrite accumulation. A positive correlation was found between nitrite accumulation and PI. Nitrate uptake experiments showed that the nitrate uptake rate per se is not responsible for PI in tomato, but maintenance of circadian nitrate uptake patterns even in 24 h light in combination with a loss of the circadian patterns for NR and NiR activities could contribute to PI. Nitrite accumulation and PI was decreased by utilizing a nutrient solution containing 25% total nitrogen at two specific 4 h periods in the day when tomato is susceptible to nitrite accumulation. We call this new technique TOD fertigation. Time-of-day fertigation in combination with a 6 °C temperature differential further reduced nitrite accumulation and PI. These findings showed the response of greenhouse tomatoes to supplemental lighting and the potential for increasing the photoperiod threshold for PI. Advisors/Committee Members: Micallef, Barry J. (advisor).

Subjects/Keywords: nitrate uptake; chlorosis; low nitrogen nutrient solution; temperature differential

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Orozco Gaeta, M. E. (2012). Relationship among nitrogen nutrition, photoperiod and photoperiodic injury in tomato (Solanum lycopersicum). (Doctoral Dissertation). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/4050

Chicago Manual of Style (16^th Edition):

Orozco Gaeta, Maria Emilia. “Relationship among nitrogen nutrition, photoperiod and photoperiodic injury in tomato (Solanum lycopersicum).” 2012. Doctoral Dissertation, University of Guelph. Accessed April 13, 2021. https://atrium.lib.uoguelph.ca/xmlui/handle/10214/4050.

MLA Handbook (7^th Edition):

Orozco Gaeta, Maria Emilia. “Relationship among nitrogen nutrition, photoperiod and photoperiodic injury in tomato (Solanum lycopersicum).” 2012. Web. 13 Apr 2021.

Vancouver:

Orozco Gaeta ME. Relationship among nitrogen nutrition, photoperiod and photoperiodic injury in tomato (Solanum lycopersicum). [Internet] [Doctoral dissertation]. University of Guelph; 2012. [cited 2021 Apr 13]. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/4050.

Council of Science Editors:

Orozco Gaeta ME. Relationship among nitrogen nutrition, photoperiod and photoperiodic injury in tomato (Solanum lycopersicum). [Doctoral Dissertation]. University of Guelph; 2012. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/4050

University of Waikato

20. Telfer, Erin Isobel Charlotte. Leaching and uptake of nitrogen, and pasture production, associated with irrigation of treated wastewater, Taupō, New Zealand .

Degree: 2013, University of Waikato

URL: http://hdl.handle.net/10289/7938

► Secondary-treated wastewater from Taupō Township is irrigated onto perennial ryegrass (Lolium perenne) which is harvested and removed from the View Road wastewater treatment site. To… (more)

▼ Secondary-treated wastewater from Taupō Township is irrigated onto perennial ryegrass (Lolium perenne) which is harvested and removed from the View Road wastewater treatment site. To determine the fate of the applied wastewater nitrogen, 48 undisturbed barrel lysimeters (30 cm diameter x 43 cm depth) were installed throughout 29 hectares. Centre pivot travelling irrigators were programmed to vary in speed to provide target wastewater application rates of about 0, 450, 550 and 650 kg N ha⁻¹yr⁻¹. The targeted application treatments were not achieved, with the achieved nitrogen loading rates grouped into a low treatment (286 - 380 kg N ha⁻¹yr⁻¹), a medium treatment (380 - 445 kg N ha⁻¹yr⁻¹), and a high treatment (445 - 567 kg N ha⁻¹yr⁻¹). Nitrogen input in control sectors was assumed to be 5 kg N/ha/yr from atmospheric nitrogen deposition. A mean of 4 to 6% of the applied nitrogen was leached. The mean amount of nitrogen leached from the high treatment (28.6 ± 10.1 kg N ha⁻¹yr⁻¹) was higher (P < 0.05) than from the low treatment (12.7 ± 4.2 kg N ha⁻¹yr⁻¹). The medium treatment (16.0 ± 7.2 kg N ha⁻¹yr⁻¹) was not significantly different than the low treatment or the high treatment. The mean amount of nitrogen leached from the control treatment was 2.8 ± 0.6 kg N ha⁻¹yr⁻¹. Nitrogen leaching that occurred in the high application treatment was below the consented limit of 30 kg N ha⁻¹yr⁻¹. A mean of 79 to 100% of the applied nitrogen was removed by pasture. There were no significant differences in pasture dry matter production, or nitrogen removal, between the low treatment (13 922 ± 1196 kg DM ha⁻¹yr⁻¹and 341 ± 25 kg N ha⁻¹yr⁻¹), the medium treatment (13 543 ± 1475 kg DM ha⁻¹yr⁻¹ and 360 ± 51 kg N ha⁻¹yr⁻¹), and the high treatment (15 285 ± 1919 kg DM ha⁻¹yr⁻¹ and 385 ± 43 kg N ha⁻¹yr⁻¹). Pasture production was higher (P < 0.001) in irrigated pastures (mean of all irrigated treatments, 14 250 ± 349 kg DM ha⁻¹yr⁻¹) than unirrigated controls (5300 ± 839 kg DM ha⁻¹yr⁻¹). A mean of -4 to 16% of the applied wastewater nitrogen was unaccounted for. The majority of unrecovered nitrogen was presumed to be volatilised with lower potential for denitrification and soil storage. A second experiment was undertaken to determine whether a five week or a ten week harvesting frequency would result in greater pasture production and nitrogen removal. During the ten month trial, 265 kg N ha⁻¹ of wastewater nitrogen was irrigated and pasture plots (1 m x 1 m) were cut with a mower. Nitrogen removal and pasture production were higher (P < 0.05) with a five week harvesting interval (8231 ± 186 kg DM ha⁻¹ and 250 ± 5 kg N ha⁻¹) than a ten week harvesting interval (7354 ± 67 kg DM ha⁻¹ and 191 ± 3 kg N ha⁻¹). Harvesting at five week intervals during late-November to May (late-spring to late-autumn) and ten week intervals from May until early-November (late-autumn to mid-spring) is recommended to maximise both pasture production and nitrogen removal, while minimising harvesting costs. Advisors/Committee Members: Balks, Megan R (advisor), Schipper, Louis A (advisor).

Subjects/Keywords: Wastewater; effluent; irrigation; pasture; land treatment; Taupo; nitrogen; leaching; uptake

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Telfer, E. I. C. (2013). Leaching and uptake of nitrogen, and pasture production, associated with irrigation of treated wastewater, Taupō, New Zealand . (Masters Thesis). University of Waikato. Retrieved from http://hdl.handle.net/10289/7938

Chicago Manual of Style (16^th Edition):

Telfer, Erin Isobel Charlotte. “Leaching and uptake of nitrogen, and pasture production, associated with irrigation of treated wastewater, Taupō, New Zealand .” 2013. Masters Thesis, University of Waikato. Accessed April 13, 2021. http://hdl.handle.net/10289/7938.

MLA Handbook (7^th Edition):

Telfer, Erin Isobel Charlotte. “Leaching and uptake of nitrogen, and pasture production, associated with irrigation of treated wastewater, Taupō, New Zealand .” 2013. Web. 13 Apr 2021.

Vancouver:

Telfer EIC. Leaching and uptake of nitrogen, and pasture production, associated with irrigation of treated wastewater, Taupō, New Zealand . [Internet] [Masters thesis]. University of Waikato; 2013. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/10289/7938.

Council of Science Editors:

Telfer EIC. Leaching and uptake of nitrogen, and pasture production, associated with irrigation of treated wastewater, Taupō, New Zealand . [Masters Thesis]. University of Waikato; 2013. Available from: http://hdl.handle.net/10289/7938

21. Haddad, Cylia. Effet d'un rapport de Sillicium sur la senescence foliaire et les performances agronomiques du colza : Effect of silicon supply on foliar senescence and agronomic performances of rapeseed.

Degree: Docteur es, Sciences agronomiques, biotechnologies agro-alimentaires, 2018, Normandie

URL: http://www.theses.fr/2018NORMC270

►

Le colza (Brassica napus L.) est une plante de grande culture nécessitant de forts intrants azotés et présentant une faible Efficience d’Utilisation de l’Azote (EUA)… (more)

▼

Le colza (Brassica napus L.) est une plante de grande culture nécessitant de forts intrants azotés et présentant une faible Efficience d’Utilisation de l’Azote (EUA) principalement due à une faible efficience de remobilisation cet élément durant la sénescence foliaire. Actuellement, une amélioration du bilan agroenvironnemental de la culture du colza, nécessite la mise au point de nouvelles pratiques culturales permettant de maintenir (voire d’améliorer) son rendement tout en limitant les doses d’intrants azotés. Dans ce contexte, l’utilisation d’éléments bénéfiques tels que le silicium (Si) dont les effets ont déjà été démontrés dans la tolérance à certains stress nutritionnels (phosphore et potassium) constitue une alternative intéressante. Les objectifs de cette étude visent à étudier l’effet du Si (i) sur la progression de la sénescence foliaire, l’absorption et la remobilisation de l’azote et les performances agronomiques du colza cultivé en hydroponie ou en conditions de plein champ et soumis ou non à une limitation ou une privation en azote. Nos travaux montrent, qu’en dépit de son caractère faiblement accumulateur en Si, le colza absorbe le Si puis le stocke essentiellement au niveau racinaire. Par ailleurs, un apport de Si de courte durée (7 jours ; 1,7 mM) à des jeunes plantes privées en azote provoque un retard de sénescence des feuilles matures associé un maintien de leur teneur en chlorophylles et de leur activité photosynthétique. De plus, au champ, un apport de Si (12 kg ha-1) à des plantes cultivées avec 160 kg N ha-1 s’accompagne d’une augmentation du rendement grainier (+4,2 quintaux ha-1). L'utilisation de l’indice agronomique «Agronomic Nitrogen Recovery (ANR)» combinée à l’étude de l’expression de gènes codant des transporteurs d’azote (BnaNRT1.1, BnaNRT2.1, BnaAMT1.1) montrent que le Si agit notamment en stimulant l’absorption de l’azote chez le colza. Enfin, une analyse différentielle par RNAseq des transcriptomes racinaires de jeunes plantes traitées ou non avec du Si pendant une courte durée (7 jours ; 1,7 mM), montre que le Si module l’expression de 1079 gènes, 334 étant induits et 745 réprimés. Ce résultat indique qu’en plus de son rôle mécanique, le Si exerce également un rôle signalétique.

Rapeseed (Brassica napus L.) is a crop that requires high nitrogen inputs and has a low Nitrogen Utilization Efficiency (NUE) mainly due to a low remobilization efficiency during leaf senescence. Currently, an improvement of the agro-environmental balance of rapeseed, requires the development of new cultural practices to maintain (or even improve) its yield in response to low nitrogen inputs. In this context, the use of beneficial element such as silicon (Si) with previously demonstrated effects on tolerance to some nutritional stress (phosphorus and potassium), constitutes an interesting alternative. The objectives of this study are to investigate the effect of Si on the progression of leaf senescence, nitrogen uptake and remobilization but also on agronomic performances of rapeseed grown in…

Advisors/Committee Members: Etienne, Philippe (thesis director), Lainé, Philippe (thesis director).

Subjects/Keywords: Sénescence; Agrononomic indexes; Nitrogen; Rapeseed; RNAseq; Senescence; Silicon; Uptake

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Haddad, C. (2018). Effet d'un rapport de Sillicium sur la senescence foliaire et les performances agronomiques du colza : Effect of silicon supply on foliar senescence and agronomic performances of rapeseed. (Doctoral Dissertation). Normandie. Retrieved from http://www.theses.fr/2018NORMC270

Chicago Manual of Style (16^th Edition):

Haddad, Cylia. “Effet d'un rapport de Sillicium sur la senescence foliaire et les performances agronomiques du colza : Effect of silicon supply on foliar senescence and agronomic performances of rapeseed.” 2018. Doctoral Dissertation, Normandie. Accessed April 13, 2021. http://www.theses.fr/2018NORMC270.

MLA Handbook (7^th Edition):

Haddad, Cylia. “Effet d'un rapport de Sillicium sur la senescence foliaire et les performances agronomiques du colza : Effect of silicon supply on foliar senescence and agronomic performances of rapeseed.” 2018. Web. 13 Apr 2021.

Vancouver:

Haddad C. Effet d'un rapport de Sillicium sur la senescence foliaire et les performances agronomiques du colza : Effect of silicon supply on foliar senescence and agronomic performances of rapeseed. [Internet] [Doctoral dissertation]. Normandie; 2018. [cited 2021 Apr 13]. Available from: http://www.theses.fr/2018NORMC270.

Council of Science Editors:

Haddad C. Effet d'un rapport de Sillicium sur la senescence foliaire et les performances agronomiques du colza : Effect of silicon supply on foliar senescence and agronomic performances of rapeseed. [Doctoral Dissertation]. Normandie; 2018. Available from: http://www.theses.fr/2018NORMC270

KTH

22. Tedla, Amhagiyorgis. Environmental modeling study of water adequacy and yield from an irrigated rice field in Mali.

Degree: Land and Water Resources Engineering, 2015, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170064

► A process oriented modeling of an irrigated rice field in a semi arid area of Mali has been done with the help of computational… (more)

Subjects/Keywords: CoupModel; Yield; Irrigation rate; Evapotranspiration; Runoff; Nitrogen uptake and leaching

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tedla, A. (2015). Environmental modeling study of water adequacy and yield from an irrigated rice field in Mali. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170064

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tedla, Amhagiyorgis. “Environmental modeling study of water adequacy and yield from an irrigated rice field in Mali.” 2015. Thesis, KTH. Accessed April 13, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170064.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tedla, Amhagiyorgis. “Environmental modeling study of water adequacy and yield from an irrigated rice field in Mali.” 2015. Web. 13 Apr 2021.

Vancouver:

Tedla A. Environmental modeling study of water adequacy and yield from an irrigated rice field in Mali. [Internet] [Thesis]. KTH; 2015. [cited 2021 Apr 13]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170064.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tedla A. Environmental modeling study of water adequacy and yield from an irrigated rice field in Mali. [Thesis]. KTH; 2015. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170064

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Notre Dame

23. Alexander Joseph Reisinger. Assessing the role of the water column in nutrient dynamics of lotic ecosystems</h1>.

Degree: Biological Sciences, 2015, University of Notre Dame

URL: https://curate.nd.edu/show/4t64gm82d82

► Excess nitrogen (N) and phosphorus (P) from agricultural and urban lands cause numerous water quality problems in freshwater ecosystems, including eutrophication, reduced biodiversity, and… (more)

▼ Excess nitrogen (N) and phosphorus (P) from agricultural and urban lands cause numerous water quality problems in freshwater ecosystems, including eutrophication, reduced biodiversity, and drinking water contamination. As N and P are transferred from terrestrial to marine ecosystems via river networks, they are assimilated by autotrophs (i.e., algae, macrophytes) and heterotrophs (i.e., fungi, bacteria) or transformed via dissimilatory processes (i.e., denitrification). As such, nutrient processing may mitigate the effects of nutrient pollution on downstream ecosystems, either by removing nutrients prior to export, or buffering the timing and form of nutrient export. Watershed models of nutrient dynamics either assume that rivers are pipes, transporting nutrients downstream without any biological activity, or that rivers are oversized streams, and the biological processes occurring in streams also occur in rivers. Nutrient dynamics in streams are controlled by benthic (i.e., bottom) processes, whereas water column processes are ignored in all but the largest rivers. My dissertation research examined the role of the water column in nutrient dynamics of rivers, with a focus on how human land use may alter these dynamics. I found that water column nutrient uptake occurs across a variety of streams and rivers. However, across fifteen similarly sized rivers, water column nutrient uptake and the water column contribution to reach-scale uptake increased with human land use. I also found that human land use influenced nutrient limitation in benthic biofilms. I used novel techniques to measure denitrification in the sediment and water column of five Midwestern rivers, and found that the water column can be an important contributor to denitrification. Finally, I developed a hydrologic-biogeochemical model to predict the effect of dams on downstream N retention and transport. I found that hydrologic variation induced through dam management may make the river downstream of the dam more of a N sink. Overall, my dissertation shows that the water column can be an important and previously unaccounted for contributor to whole-river nutrient dynamics. Due to the biogeochemical activity of the sediment and the water column, rivers can process nutrients at rates comparable to headwater streams. Advisors/Committee Members: Emma Rosi-Marshall, Committee Member, Stuart Jones, Committee Member, Jennifer L. Tank, Committee Chair, Gary Lamberti, Committee Member, Alan Hamlet, Committee Member.

Subjects/Keywords: water column; nutrient uptake; denitrification; nitrogen; phosphorus; river

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Reisinger, A. J. (2015). Assessing the role of the water column in nutrient dynamics of lotic ecosystems</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/4t64gm82d82

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Reisinger, Alexander Joseph. “Assessing the role of the water column in nutrient dynamics of lotic ecosystems</h1>.” 2015. Thesis, University of Notre Dame. Accessed April 13, 2021. https://curate.nd.edu/show/4t64gm82d82.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Reisinger, Alexander Joseph. “Assessing the role of the water column in nutrient dynamics of lotic ecosystems</h1>.” 2015. Web. 13 Apr 2021.

Vancouver:

Reisinger AJ. Assessing the role of the water column in nutrient dynamics of lotic ecosystems</h1>. [Internet] [Thesis]. University of Notre Dame; 2015. [cited 2021 Apr 13]. Available from: https://curate.nd.edu/show/4t64gm82d82.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Reisinger AJ. Assessing the role of the water column in nutrient dynamics of lotic ecosystems</h1>. [Thesis]. University of Notre Dame; 2015. Available from: https://curate.nd.edu/show/4t64gm82d82

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

24. De Oliveira Silva, Amanda. Genotype, environment, and management interactions on grain yield and nutrient uptake dynamics in winter wheat.

Degree: PhD, Department of Agronomy, 2019, Kansas State University

URL: http://hdl.handle.net/2097/40084

► Understanding factors underpinning the variation in nitrogen (N) utilization efficiency (NUtE) [i.e., grain yield per unit of N uptake at maturity] is critical to direct… (more)

▼ Understanding factors underpinning the variation in nitrogen (N) utilization efficiency (NUtE) [i.e., grain yield per unit of N uptake at maturity] is critical to direct future breeding and agronomic management strategies in wheat. However, no study has summarized changes in wheat NUtE across a wide range of environments. Further, the conservative behavior of producers to intensify management practices may have been contributing to the yield stagnation in the US southern Great Plains. Our goals were to: (i) perform a synthesis-analysis using published data to study NUtE in wheat, and (ii) conduct field studies to investigate the influence of genotype, environment, and management on grain yield and nutrient uptake. Results from our synthesis-analysis (n=529) showed a positive and curvilinear relationship between grain yield and NupMAT, indicating that opportunities to enhance yield through improving NUtE would only be possible at greater-than-average yield and N uptake levels. By measuring the effects of other reported variables on the residuals of the relationship between NUtE and N uptake, we observed that the variability in NUtE at particular levels of N uptake was greater for fall- than for winter-sown wheat, but it was similar for all wheat classes. The negative correlation between grain protein concentration and the residuals indicated a challenge to increase yield through improving NUtE with no penalties in grain protein. We conducted two field research experiments at difference sites during the 2015-16 and 2016-17 growing seasons in Kansas. In our experiment 1, we conducted on-farm experiments across three locations and two growing seasons in Kansas using 21 modern winter wheat genotypes grown under either standard (SM) or intensified management (IM) systems. Results showed that across all sites-years and genotypes, the IM increased yield by 0.9 Mg ha⁻¹ relative to the SM. Even in the lowest yielding background condition, the IM outyielded SM, and expectedly, the yield response to IM increased with the achievable yield of the environment. The yield response of genotypes to IM was related to the responses of biomass between the two management systems rather than harvest index, strongly driven by improvements in grain number while independent of changes in grain weight, and related to improvements in N uptake. In our experiment 2, we evaluated the partial contribution of 14 management practices on grain yield and the accumulation of N, P, K and S during the growing season using a single bread-wheat genotype grown under four site-years. Fungicide was the main treatment affecting yield and nutrient uptake. Overall, all nutrients were accumulated at a similar proportion at each growth stage relative to their respective accumulation at the end of the season. Shoot concentration for IM seemed to maintain higher concentration of nutrients as compared to the SM control during the growing season. This was emphasized by the significant increase in nutrition indices for N and S from SM to IM control, indicating possible… Advisors/Committee Members: Romulo P. Lollato.

Subjects/Keywords: Nitrogen economy; N utilization; Yield gap; N use efficiency; Macronutrients uptake

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

De Oliveira Silva, A. (2019). Genotype, environment, and management interactions on grain yield and nutrient uptake dynamics in winter wheat. (Doctoral Dissertation). Kansas State University. Retrieved from http://hdl.handle.net/2097/40084

Chicago Manual of Style (16^th Edition):

De Oliveira Silva, Amanda. “Genotype, environment, and management interactions on grain yield and nutrient uptake dynamics in winter wheat.” 2019. Doctoral Dissertation, Kansas State University. Accessed April 13, 2021. http://hdl.handle.net/2097/40084.

MLA Handbook (7^th Edition):

De Oliveira Silva, Amanda. “Genotype, environment, and management interactions on grain yield and nutrient uptake dynamics in winter wheat.” 2019. Web. 13 Apr 2021.

Vancouver:

De Oliveira Silva A. Genotype, environment, and management interactions on grain yield and nutrient uptake dynamics in winter wheat. [Internet] [Doctoral dissertation]. Kansas State University; 2019. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/2097/40084.

Council of Science Editors:

De Oliveira Silva A. Genotype, environment, and management interactions on grain yield and nutrient uptake dynamics in winter wheat. [Doctoral Dissertation]. Kansas State University; 2019. Available from: http://hdl.handle.net/2097/40084

University of Aberdeen

25. Ayub, Najma. The effect of VAM inoculation on interplant ¹⁵N transfer.

Degree: PhD, 1991, University of Aberdeen

URL: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152419460005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290173

► This thesis reports a study carried out to investigate the involvement of VA mycorrhizas in interplant 15N transfer in a model pasture system and in… (more)

▼ This thesis reports a study carried out to investigate the involvement of VA mycorrhizas in interplant 15N transfer in a model pasture system and in a model agroforestry system. Two pot experiments were designed to investigate the effect of VAM inoculation on 15N transfer from clover to rye grass in sterile (in the first experiment the sterilisation was by autoclaving and in the second, by gamma-irradiation) and fresh soil. A third pot experiment was designed to investigate the effect of VAM inoculation on 15N transfer from grass and clover to wild cherry seedlings in fresh soil. For these pot experiments donor plant seedlings were labelled with 15N by growing in Hoaglands solution containing K 15NO3 (5 atom % 15N). To study 15 N transfer and its possible mechanisms, plants and soil samples were analysed for 15N, total N (14N + 15N) and P concentrations. Rates of soil nitrogen mineralisation and nitrification, as well as 15N enrichment of available N were also determined to investigate N transfer through soil. There was transfer of 15N from donor to receiver in the simulated pasture system as well as in simulated agroforestry system. The transfer of 15N was increased by VAM inoculation. The transfer of 15N was small in relation to plant nutrition and was not associated with an increase in total N in the receiver plants although P concentrations were generally increased. There was no increase in the soil N fluxes of mineralisation and nitrification associated with enhanced 15N transfer from donor to receiver in the VAM inoculated system. In addition, there was often no increase in the 15N concentration in the soil available N pool of VAM inoculated systems. There was no evidence, therefore, of increased transfer of 15N through the soil in VAM inoculated systems with enhanced 15N interplant transfer, suggesting the likely involvement of VAM fungal hyphae. There was no marked effect on plant growth due to VAM inoculation. The growth of cherry, however, was reduced when grown with grass and this may have been due to N competition between the root systems. The growth of cherry seedlings was reduced to a lesser extent when grown with clover compared to when grown with grass. The findings of this study suggest that VA mycorrhizal hyphae play a part in interplant transfer of nitrogen. Although the study did not demonstrate high rates of 15N transfer in VAM inoculated system, circumstances are discussed where VAM interplant transfer of nutrients may become significant at the single plant, community and ecosystem level. The benefits to man of VAM mediated N transfer may be best realised in land use systems such as pastures having legumes and non-legumes, in mixed cropping of legumes and non-legumes and in an agroforestry system with a legume component, particularly when the soil is deficient in nutrients such as nitrogen and phosphorus.

Subjects/Keywords: 580; Nitrogen uptake in plants

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ayub, N. (1991). The effect of VAM inoculation on interplant ¹⁵N transfer. (Doctoral Dissertation). University of Aberdeen. Retrieved from https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152419460005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290173

Chicago Manual of Style (16^th Edition):

Ayub, Najma. “The effect of VAM inoculation on interplant ¹⁵N transfer.” 1991. Doctoral Dissertation, University of Aberdeen. Accessed April 13, 2021. https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152419460005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290173.

MLA Handbook (7^th Edition):

Ayub, Najma. “The effect of VAM inoculation on interplant ¹⁵N transfer.” 1991. Web. 13 Apr 2021.

Vancouver:

Ayub N. The effect of VAM inoculation on interplant ¹⁵N transfer. [Internet] [Doctoral dissertation]. University of Aberdeen; 1991. [cited 2021 Apr 13]. Available from: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152419460005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290173.

Council of Science Editors:

Ayub N. The effect of VAM inoculation on interplant ¹⁵N transfer. [Doctoral Dissertation]. University of Aberdeen; 1991. Available from: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152419460005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290173

KTH

26. Wójcik, Weronika. Evaluation of microbiological activity during the deammonification process for nitrogen removal.

Degree: Sewage and Waste technology, 2011, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96300

► This master thesis is based on own studies. A four-month study was performed at Hammarby Sjostad Research Station, which is located in Stockholm. One-stage… (more)

Subjects/Keywords: Anammox; Moving Bed Biofilm Reactor; nitrogen removal; batch test; Specific Anammox Activity; Oxygen Uptake Rate; Nitrate Uptake Rate

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wójcik, W. (2011). Evaluation of microbiological activity during the deammonification process for nitrogen removal. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96300

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wójcik, Weronika. “Evaluation of microbiological activity during the deammonification process for nitrogen removal.” 2011. Thesis, KTH. Accessed April 13, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96300.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wójcik, Weronika. “Evaluation of microbiological activity during the deammonification process for nitrogen removal.” 2011. Web. 13 Apr 2021.

Vancouver:

Wójcik W. Evaluation of microbiological activity during the deammonification process for nitrogen removal. [Internet] [Thesis]. KTH; 2011. [cited 2021 Apr 13]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96300.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wójcik W. Evaluation of microbiological activity during the deammonification process for nitrogen removal. [Thesis]. KTH; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96300

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Humboldt State University

27. Swanson, Charles R. Annual and seasonal dissolved inorganic nutrient budgets for Humboldt Bay with implications for wastewater dischargers.

Degree: MS, Environmental Systems: Environmental Resource Engineering, 2015, Humboldt State University

URL: http://hdl.handle.net/10211.3/163081

► Dissolved inorganic nutrient loading and uptake have been estimated for each of the four major compartments of Humboldt Bay for the two major seasons characterized… (more)

▼ Dissolved inorganic nutrient loading and uptake have been estimated for each of the four major compartments of Humboldt Bay for the two major seasons characterized by ocean upwelling (April through September) and watershed runoff (October through March). Dissolved inorganic nutrient loading estimations include dissolved inorganic nitrogen (DIN) as ammonium-N, nitrate-N, and nitrite-N, dissolved inorganic phosphorus (DIP) as phosphate-P, and dissolved inorganic silicon (DSi) as silicate-Si. DIN and DIP uptake estimations include phytoplankton, macroalgae, and eelgrass production, intertidal sediment flux, and denitrification. A water budget including tidal flows, watershed runoff, wastewater discharge, and direct precipitation on the Bay is also included as a means for determining mass inputs from various sources using concentration data. Humboldt Bay is a nitrogen limited system exhibiting stoichiometric N:P ratios below the 16:1 Redfield ratio. N:P ratios decrease significantly inside Arcata Bay (the inner-most compartment of Humboldt Bay) compared with water near the Bay entrance during the upwelling season, indicating that denitrification is a major contributor to nitrogen removal from the system during these periods. This also suggests that Arcata Bay is more nitrogen limited than nearshore waters, as denitrification removes N and not P from the system. Annual estimates of denitrification in Humboldt Bay using areal denitrification rates from a nearby tidal estuary indicate that denitrification may be over five-times greater than the total wastewater DIN discharge, 768 Mg N/yr and 149 Mg N/yr, respectively. Estimates of phytoplankton, macroalgae, and eelgrass production in the Bay are also greater than wastewater DIN discharge loads. Freshwater DIN and DIP loads to Humboldt Bay are minor in comparison with estimates of nearshore nutrient loading. Average annual DIN and DIP loading to Humboldt Bay from nearshore waters is approximately 14,363 Mg N/yr and 2,653 Mg P/yr, respectively, with only 1.7% of the total nearshore load, 239 Mg N/yr and 44 Mg P/yr, respectively, estimated to be directly loaded to Arcata Bay. DIN inputs to Arcata Bay from freshwater sources including wastewater and watershed runoff contribute 40 Mg N/yr and 51 Mg N/yr, respectively, or 17% and 21% of the estimated load from nearshore waters, respectively. DIP inputs to Arcata Bay from wastewater and watershed discharges contribute 13 Mg P/yr and 6 Mg P/yr, respectively, or 21% and 10% of the nearshore load, respectively. During the upwelling and runoff seasons, the Arcata wastewater treatment facility (AWTF) DIN discharge to Arcata Bay makes up 5% and 18% of the total load to the Bay, respectively, and 16% and 25% of the DIP load, respectively. Eutrophication potential in Humboldt Bay increases during the productive upwelling season as biological uptake of DIN and DIP increase by an estimated 250% and 415%, respectively, and nearshore loading increases by 20% and 14%, respectively. Watershed runoff DIN and DIP loads decrease during the… Advisors/Committee Members: Finney, Brad A..

Subjects/Keywords: Humboldt Bay; Nutrients; Nutrient budget; Nutrient loading; Nutrient uptake; Water quality; Eutrophication; Nitrogen; Phosphorus; Silicon

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Swanson, C. R. (2015). Annual and seasonal dissolved inorganic nutrient budgets for Humboldt Bay with implications for wastewater dischargers. (Masters Thesis). Humboldt State University. Retrieved from http://hdl.handle.net/10211.3/163081

Chicago Manual of Style (16^th Edition):

Swanson, Charles R. “Annual and seasonal dissolved inorganic nutrient budgets for Humboldt Bay with implications for wastewater dischargers.” 2015. Masters Thesis, Humboldt State University. Accessed April 13, 2021. http://hdl.handle.net/10211.3/163081.

MLA Handbook (7^th Edition):

Swanson, Charles R. “Annual and seasonal dissolved inorganic nutrient budgets for Humboldt Bay with implications for wastewater dischargers.” 2015. Web. 13 Apr 2021.

Vancouver:

Swanson CR. Annual and seasonal dissolved inorganic nutrient budgets for Humboldt Bay with implications for wastewater dischargers. [Internet] [Masters thesis]. Humboldt State University; 2015. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/10211.3/163081.

Council of Science Editors:

Swanson CR. Annual and seasonal dissolved inorganic nutrient budgets for Humboldt Bay with implications for wastewater dischargers. [Masters Thesis]. Humboldt State University; 2015. Available from: http://hdl.handle.net/10211.3/163081

North Carolina State University

28. Lenhart, Hayes Austin. A North Carolina field study to evaluate the effect of a coastal stormwater wetland on water quality and quantity and nitrogen accumulation in five wetland plants in two constructed stormwater wetlands.

Degree: MS, Biological and Agricultural Engineering, 2008, North Carolina State University

URL: http://www.lib.ncsu.edu/resolver/1840.16/2890

Subjects/Keywords: nitrogen; wetland; BMP; stormwater; plant uptake

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lenhart, H. A. (2008). A North Carolina field study to evaluate the effect of a coastal stormwater wetland on water quality and quantity and nitrogen accumulation in five wetland plants in two constructed stormwater wetlands. (Thesis). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/2890

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lenhart, Hayes Austin. “A North Carolina field study to evaluate the effect of a coastal stormwater wetland on water quality and quantity and nitrogen accumulation in five wetland plants in two constructed stormwater wetlands.” 2008. Thesis, North Carolina State University. Accessed April 13, 2021. http://www.lib.ncsu.edu/resolver/1840.16/2890.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lenhart, Hayes Austin. “A North Carolina field study to evaluate the effect of a coastal stormwater wetland on water quality and quantity and nitrogen accumulation in five wetland plants in two constructed stormwater wetlands.” 2008. Web. 13 Apr 2021.

Vancouver:

Lenhart HA. A North Carolina field study to evaluate the effect of a coastal stormwater wetland on water quality and quantity and nitrogen accumulation in five wetland plants in two constructed stormwater wetlands. [Internet] [Thesis]. North Carolina State University; 2008. [cited 2021 Apr 13]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/2890.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lenhart HA. A North Carolina field study to evaluate the effect of a coastal stormwater wetland on water quality and quantity and nitrogen accumulation in five wetland plants in two constructed stormwater wetlands. [Thesis]. North Carolina State University; 2008. Available from: http://www.lib.ncsu.edu/resolver/1840.16/2890

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Northeastern University

29. Perini, Valerie Catlin. The role of seasonality, seaweed traits, and seaweed-herbivore interactions in nutrient cycling in the southern Gulf of Maine.

Degree: Department of Biology, 2013, Northeastern University

URL: http://hdl.handle.net/2047/d20003074

► Environmental fluctuations associated with both natural events and anthropogenic impacts can appreciably alter the functioning of ecosystems. For example, in the Gulf of Maine, there… (more)

▼ Environmental fluctuations associated with both natural events and anthropogenic impacts can appreciably alter the functioning of ecosystems. For example, in the Gulf of Maine, there is substantial spatial and temporal variation in availability of nutrients that fuel primary production. Macroalgae are important primary producers in intertidal and shallow benthic habitats, and they play essential roles in absorbing nutrients (e.g., inorganic C, N, and P) and mediating their availability (e.g., as organic C, N, and P) to the communities that they support. The ability of macroalgae to take up nutrients depends on nutrient availability. However, sometimes a nutrient in short supply can restrict access to another abundant nutrient, resulting in co-limitation. Macroalgae can exhibit remarkable changes in tissue quality due to tidal elevation and seasonal nutrient variability. These changes in tissue quality may influence herbivore preference, consumption rates, and the flow of materials through marine systems. Here, I evaluated potential biotic and abiotic factors mediating rates of nutrient uptake and transfer in marine communities. I used an observational approach based on long-term, weekly sampling of ambient nutrient levels and macroalgal tissue quality at two tidal elevations and across taxa. I coupled the observational approach with laboratory experiments to investigate nutrient interactions such as co-limitation, and the impact on primary producers. Additionally, I conducted feeding assays to assess herbivore impacts on macroalgae from different positions on the shore and how these impacts vary with season. Observational data revealed strong seasonal patterns in ambient and macroalgal tissue nutrient levels and indicate that ambient nitrate levels may be restricting algal ability to access ambient phosphate. Laboratory results confirmed these observations of co-limitation, illustrating that increased N availability enhances P uptake efficiency in seaweeds. Results of feeding assays demonstrated varying net effects of herbivores on macroalgae, depending on tidal elevation and season via a combination of consumption and facilitation via nutrient recycling. These results highlight how both top-down and bottom-up processes are influenced by, and in turn contribute to, nutrient availability. My research illustrates how species interactions and abiotic conditions interact to mediate nutrient cycling in intertidal ecosystems.

Subjects/Keywords: Chondrus crispus; Fucus vesiculosus; Nitrogen; nutrient uptake; Phosphorus; rocky intertidal; Marine Biology

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Perini, V. C. (2013). The role of seasonality, seaweed traits, and seaweed-herbivore interactions in nutrient cycling in the southern Gulf of Maine. (Masters Thesis). Northeastern University. Retrieved from http://hdl.handle.net/2047/d20003074

Chicago Manual of Style (16^th Edition):

Perini, Valerie Catlin. “The role of seasonality, seaweed traits, and seaweed-herbivore interactions in nutrient cycling in the southern Gulf of Maine.” 2013. Masters Thesis, Northeastern University. Accessed April 13, 2021. http://hdl.handle.net/2047/d20003074.

MLA Handbook (7^th Edition):

Perini, Valerie Catlin. “The role of seasonality, seaweed traits, and seaweed-herbivore interactions in nutrient cycling in the southern Gulf of Maine.” 2013. Web. 13 Apr 2021.

Vancouver:

Perini VC. The role of seasonality, seaweed traits, and seaweed-herbivore interactions in nutrient cycling in the southern Gulf of Maine. [Internet] [Masters thesis]. Northeastern University; 2013. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/2047/d20003074.

Council of Science Editors:

Perini VC. The role of seasonality, seaweed traits, and seaweed-herbivore interactions in nutrient cycling in the southern Gulf of Maine. [Masters Thesis]. Northeastern University; 2013. Available from: http://hdl.handle.net/2047/d20003074

Michigan Technological University

30. Coble, Ashley Anne. BIOGEOCHEMICAL CYCLING IN LAKE SUPERIOR TRIBUTARIES: SEASONALITY, QUANTITY AND QUALITY OF EXPORT.

Degree: PhD, Department of Biological Sciences, 2015, Michigan Technological University

URL: https://digitalcommons.mtu.edu/etds/965

► Seasonal and spatial variability in environmental factors may affect dissolved organic matter composition and nutrient transformation and retention in streams. The objective of this… (more)

▼ Seasonal and spatial variability in environmental factors may affect dissolved organic matter composition and nutrient transformation and retention in streams. The objective of this research was to quantify and describe seasonality, quantity, and quality of nutrient processing and export of ammonium (NH₄), soluble reactive phosphate (SRP), and dissolved organic carbon (DOC) into Lake Superior through intensive study in a small 1st order watershed coupled with snapshot measurements across 12 tributaries that varied in size, location, and wetland coverage. Our results suggest biodegradable C is exported from a small headwater stream year-round and that DOC mineralization rates can be stimulated by additions of NH₄ and labile C (Chapter 2). We found that biodegradable DOC varied synchronously among 3 rivers that varied in size by three orders of magnitude. Furthermore, these rivers exported 9 to 17% of annual DOC in biodegradable form, which may then fuel biological activity in nearshore zones of Lake Superior. Modeling of historical loads of DOC suggests that spring loads of DOC have increased and fall loads have decreased over a 26 year period, but annual loads have not (Chapter 3). Across eleven tributaries variability in NH₄ uptake velocity was explained by watershed area, discharge, and fluorescence index of DOC (indicator of microbial and terrestrial sources; Chapter 4). Temporally detailed measurements (every 2 to 4 weeks for 3 years) of nutrient uptake in a small headwater stream indicated light availability, algal and periphyton biomass, solute concentrations, and pH were important predictors of NH₄ uptake velocity (Chapter 5). We found a similar magnitude of NH₄ uptake velocity during winter and summer measurements while SRP uptake velocity was greater in summer than winter (Chapter 5). Overall the greatest uptake velocities were observed in spring and fall for NH₄, in spring for SRP and in fall for DOC (Chapter 5). Collectively, this research demonstrates the temporally dynamic nature of biodegradable carbon and nutrient uptake, the tight coupling of C and N cycling, and the role of DOM composition in stream nutrient uptake in northern temperate forested streams. Advisors/Committee Members: Amy M. Marcarelli.

Subjects/Keywords: aquatic nutrient uptake; Biodegradability; carbon; Dissolved organic matter; nitrogen; phosphorus; Biogeochemistry; Ecology and Evolutionary Biology

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Coble, A. A. (2015). BIOGEOCHEMICAL CYCLING IN LAKE SUPERIOR TRIBUTARIES: SEASONALITY, QUANTITY AND QUALITY OF EXPORT. (Doctoral Dissertation). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etds/965

Chicago Manual of Style (16^th Edition):

Coble, Ashley Anne. “BIOGEOCHEMICAL CYCLING IN LAKE SUPERIOR TRIBUTARIES: SEASONALITY, QUANTITY AND QUALITY OF EXPORT.” 2015. Doctoral Dissertation, Michigan Technological University. Accessed April 13, 2021. https://digitalcommons.mtu.edu/etds/965.

MLA Handbook (7^th Edition):

Coble, Ashley Anne. “BIOGEOCHEMICAL CYCLING IN LAKE SUPERIOR TRIBUTARIES: SEASONALITY, QUANTITY AND QUALITY OF EXPORT.” 2015. Web. 13 Apr 2021.

Vancouver:

Coble AA. BIOGEOCHEMICAL CYCLING IN LAKE SUPERIOR TRIBUTARIES: SEASONALITY, QUANTITY AND QUALITY OF EXPORT. [Internet] [Doctoral dissertation]. Michigan Technological University; 2015. [cited 2021 Apr 13]. Available from: https://digitalcommons.mtu.edu/etds/965.

Council of Science Editors:

Coble AA. BIOGEOCHEMICAL CYCLING IN LAKE SUPERIOR TRIBUTARIES: SEASONALITY, QUANTITY AND QUALITY OF EXPORT. [Doctoral Dissertation]. Michigan Technological University; 2015. Available from: https://digitalcommons.mtu.edu/etds/965

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations