subject:(agriculture)

1. Johnson, Anwar Rashaad. Aspirations Realized? Exploring the Roles of High School Counselors when Discussing Colleges and Agricultural Career Paths with African American College Students.

Degree: 2013, Texas Digital Library

URL: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66730

► Fortifying the pipeline of underrepresented African Americans in agriculture can offer a practical solution to the industry???s scanty amount of involvement by people of color.… (more)

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Johnson, A. R. (2013). Aspirations Realized? Exploring the Roles of High School Counselors when Discussing Colleges and Agricultural Career Paths with African American College Students. (Thesis). Texas Digital Library. Retrieved from http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66730

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):

Johnson, Anwar Rashaad. “Aspirations Realized? Exploring the Roles of High School Counselors when Discussing Colleges and Agricultural Career Paths with African American College Students.” 2013. Thesis, Texas Digital Library. Accessed March 02, 2021. http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66730.

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

MLA Handbook (7^th Edition):

Johnson, Anwar Rashaad. “Aspirations Realized? Exploring the Roles of High School Counselors when Discussing Colleges and Agricultural Career Paths with African American College Students.” 2013. Web. 02 Mar 2021.

Vancouver:

Johnson AR. Aspirations Realized? Exploring the Roles of High School Counselors when Discussing Colleges and Agricultural Career Paths with African American College Students. [Internet] [Thesis]. Texas Digital Library; 2013. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66730.

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

Council of Science Editors:

Johnson AR. Aspirations Realized? Exploring the Roles of High School Counselors when Discussing Colleges and Agricultural Career Paths with African American College Students. [Thesis]. Texas Digital Library; 2013. Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66730

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

Stellenbosch University

2. Raath, P. J. ( Pieter Johannes). Effect of varying levels of nitrogen, potassium and calcium nutrition on table grape vine physiology and berry quality.

Degree: Viticulture and Oenology, 2012, Stellenbosch University

URL: http://hdl.handle.net/10019.1/19996

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Thesis (PhD(Agric)) – Stellenbosch University, 2012.

ENGLISH ABSTRACT: A lack of defects is required for successful table grape marketing, which pre-suppose optimal vine performance, berry development… (more)

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Thesis (PhD(Agric)) – Stellenbosch University, 2012.

ENGLISH ABSTRACT: A lack of defects is required for successful table grape marketing, which pre-suppose optimal vine performance, berry development and post-harvest quality. The supply of mineral nutrients affects vine development, physiology and berry quality. Despite a vast amount of research conducted over decades, there remain many unresolved issues regarding table grape vine nutrition to ensure optimal table grape quality and shelve-life. Unjustified fertilisation practices often include excessive applications of nitrogen (N), potassium (K) and calcium (Ca). A four-year field trial was therefore conducted on a sandy soil in the Paarl district of South Africa, using grafted on Ramsey, and trained to a gable trellis system. Nitrogen, potassium and calcium were applied, singular or in combination, at rates up to 300% the calculated annual nutritional requirement. The effect of these excessive applications on table grape performance under typical South African cultivation conditions was investigated for Vitis vinifera L. cv. Prime Seedless, a very early seedless table cultivar that is produced with minimum berry diameter of 18mm, with special reference to 1) vegetative growth, 2) expression of grapevine nutrient availability through foliar analyses, 3) berry nutrient accumulation patterns of this early cultivar, 4) manipulation of berry nutrient content through soil and bunch directed applications and 5) the effect of berry nutrient content on its quality. No definite vegetative growth responses (expressed as shoot length, leaf surface area and shoot mass) and leaf chlorophyll content differences were obtained for all the treatments. These results were obtained in a vineyard on a sandy soil where excessive N fertilisation caused a reduction of soil pH to detrimentally low levels and where the excessive N, K and Ca applications reduced mutual concentrations and that of Mg, in the soil. A lack of stimulation in vegetative growth may therefore be ascribed to the combined negative effect of these excessive applications on soil pH and vine nutrition. Although the N content of petioles was higher for treatments where N was applied, consistent significant increases in petiole N with N fertilisation were not observed. Petiole N concentration showed a decreasing trend throughout the season. Petiole K concentrations were significantly increased by the K fertilisation at all phenological stages. None of the K fertilisation treatments, however, succeeded to raise petiole K concentrations above the accepted maximum norms and petiole K concentration at a specific sampling stage varied significantly between the four seasons. A general decrease in petiole K concentration was found for all seasons. Calcium fertilisation did not increase soil Ca content, resulting in a lack of differences in petiole Ca concentrations between treatments. An increase in petiole Ca concentration towards harvest was obtained. Correlations between petiole nutrient …

Advisors/Committee Members: Hunter, J. J., Conradie, W. J., Stellenbosch University. Faculty of AgriSciences. Dept. of Viticulture and Oenology..

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Raath, P. J. (. P. J. (2012). Effect of varying levels of nitrogen, potassium and calcium nutrition on table grape vine physiology and berry quality. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/19996

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):

Raath, P J ( Pieter Johannes). “Effect of varying levels of nitrogen, potassium and calcium nutrition on table grape vine physiology and berry quality.” 2012. Thesis, Stellenbosch University. Accessed March 02, 2021. http://hdl.handle.net/10019.1/19996.

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

MLA Handbook (7^th Edition):

Raath, P J ( Pieter Johannes). “Effect of varying levels of nitrogen, potassium and calcium nutrition on table grape vine physiology and berry quality.” 2012. Web. 02 Mar 2021.

Vancouver:

Raath PJ(PJ. Effect of varying levels of nitrogen, potassium and calcium nutrition on table grape vine physiology and berry quality. [Internet] [Thesis]. Stellenbosch University; 2012. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10019.1/19996.

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

Council of Science Editors:

Raath PJ(PJ. Effect of varying levels of nitrogen, potassium and calcium nutrition on table grape vine physiology and berry quality. [Thesis]. Stellenbosch University; 2012. Available from: http://hdl.handle.net/10019.1/19996

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

Stellenbosch University

3. Mathys, Ilse Lois. Soil health and quality concept in agricultural extension and soil science : an assessment of topsoil conditions in a long term vineyard soil management trail in Robertson, South Africa.

Degree: Soil Science, 2011, Stellenbosch University

URL: http://hdl.handle.net/10019.1/6544

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Thesis (MScAgric (Soil Science)) – University of Stellenbosch, 2011.

ENGLISH ABSTRACT: The natural resource condition or health has been accepted as a valuable indicator of sustainable… (more)

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Thesis (MScAgric (Soil Science)) – University of Stellenbosch, 2011.

ENGLISH ABSTRACT: The natural resource condition or health has been accepted as a valuable indicator of sustainable land use. The assessment of soil health (quality) has become a valuable tool in determining the sustainability of land management systems. This work aims to evaluate the sustainability of soil management practices in agricultural extension for vineyards in Robertson, South Africa based, on the current approach of the concept of soil health and soil quality, as well as to briefly explore the present reservations regarding the definition of the concept. The soil management treatments include a mechanical weed control, chemical weed control, annual addition of straw mulch, annual cover crop and perennial cover crop. The objective of study is to (i) identify suitable soil health (quality) indicators for vineyards in the study area; (ii) analyze the soil health (quality) indicators for different soil management treatments; (iii) evaluate the effect of various soil management treatments on the overall soil functionality, by comparing measured indicators to the soil property threshold values, for optimal vine growth; iv) establish a more consistent understanding and use of the terms health and quality, as understood and used in the general science community, with particular reference to the public health system. The soil physical, chemical and biological properties which were selected as indicators of soil health (quality) based on specific criteria similar to previous work done on the concept. The properties selected include soil texture, gravimetric water content, bulk density, soil aeration, water aggregate stability, soil pH, EC, available N,P,K , soil organic matter content, soil microbial biomass, potential mineralizable nitrogen and soil respiration. The study makes use of methods of analysis previously used for soil health and soil quality assessments, as well as soil analytical methods as accepted by experienced soil scientist within the study area. The soil was sampled on three separate events to depths of 0-200 mm for initial characterization of soil and 0-50 mm to compare soil health (quality) Between tracks and In tracks of treatment plots. The values obtained for each property were compared with the optimum for vineyards and ranked accordingly. The treatment that resulted in the most desirable soil health (quality) was the straw mulch and perennial cover crop treatments.

AFRIKAANSE OPSOMMING: Die toestand of gesondheid van natuurlike hulpbronne is aanvaar as `n waardevolle aanduiding van volhoubare grondgebruik. Die assessering van grond gesondheid (kwaliteit) is 'n waardevolle hulpmiddel in die bepaling van die volhoubaarheid van grond bestuur stelsels. Hierdie werkstuk poog om die volhoubaarheid van grond bestuurs praktyke te evalueer vir wingerde in Robertson, Suid-Afrika wat baseer is op die huidige benadering van grond gesondheid en…

Advisors/Committee Members: Rozanov, Andrei, Hoffman, J. E., University of Stellenbosch. Faculty of AgriSciences. Dept. of Soil Science..

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Mathys, I. L. (2011). Soil health and quality concept in agricultural extension and soil science : an assessment of topsoil conditions in a long term vineyard soil management trail in Robertson, South Africa. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/6544

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):

Mathys, Ilse Lois. “Soil health and quality concept in agricultural extension and soil science : an assessment of topsoil conditions in a long term vineyard soil management trail in Robertson, South Africa.” 2011. Thesis, Stellenbosch University. Accessed March 02, 2021. http://hdl.handle.net/10019.1/6544.

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

MLA Handbook (7^th Edition):

Mathys, Ilse Lois. “Soil health and quality concept in agricultural extension and soil science : an assessment of topsoil conditions in a long term vineyard soil management trail in Robertson, South Africa.” 2011. Web. 02 Mar 2021.

Vancouver:

Mathys IL. Soil health and quality concept in agricultural extension and soil science : an assessment of topsoil conditions in a long term vineyard soil management trail in Robertson, South Africa. [Internet] [Thesis]. Stellenbosch University; 2011. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10019.1/6544.

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

Council of Science Editors:

Mathys IL. Soil health and quality concept in agricultural extension and soil science : an assessment of topsoil conditions in a long term vineyard soil management trail in Robertson, South Africa. [Thesis]. Stellenbosch University; 2011. Available from: http://hdl.handle.net/10019.1/6544

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

4. Gollub, Elisa Rachel. Many Perestroikas: A Social History of Collective Farm Privatization in Russia.

Degree: PhD, History, 2011, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:11340/

► The dissertation provides a social history of collective farm privatization, focusing specifically on three former collective farms in the Nizhnii Novgorod, Riazan� and Krasnodar regions… (more)

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Gollub, E. R. (2011). Many Perestroikas: A Social History of Collective Farm Privatization in Russia. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:11340/

Chicago Manual of Style (16^th Edition):

Gollub, Elisa Rachel. “Many Perestroikas: A Social History of Collective Farm Privatization in Russia.” 2011. Doctoral Dissertation, Brown University. Accessed March 02, 2021. https://repository.library.brown.edu/studio/item/bdr:11340/.

MLA Handbook (7^th Edition):

Gollub, Elisa Rachel. “Many Perestroikas: A Social History of Collective Farm Privatization in Russia.” 2011. Web. 02 Mar 2021.

Vancouver:

Gollub ER. Many Perestroikas: A Social History of Collective Farm Privatization in Russia. [Internet] [Doctoral dissertation]. Brown University; 2011. [cited 2021 Mar 02]. Available from: https://repository.library.brown.edu/studio/item/bdr:11340/.

Council of Science Editors:

Gollub ER. Many Perestroikas: A Social History of Collective Farm Privatization in Russia. [Doctoral Dissertation]. Brown University; 2011. Available from: https://repository.library.brown.edu/studio/item/bdr:11340/

Purdue University

5. Jahed, Khalil Rahman. Male and female interaction in apple: Pollen tube growth, fruit set, fruit quality, and return bloom.

Degree: MS, Horticulture and Landscape Architecture, 2015, Purdue University

URL: http://docs.lib.purdue.edu/open_access_theses/495

► In apple, adequate and appropriate pollination and fertilization is required for fruit set, fruit quality and subsequent fruit growth. Pollen source, pollen-style interaction and… (more)

▼ In apple, adequate and appropriate pollination and fertilization is required for fruit set, fruit quality and subsequent fruit growth. Pollen source, pollen-style interaction and compatibility, and ample pollen tube growth are potentially highly influential factors on the fertilization and fruit setting process. Pollinizer is considered to be one of the influential factors and has a remarkable impact on fertilization. However, basic information on the level of pollinizer compatibility and its contribution to yield is lacking for many commercial apple cultivars. Hence, we conducted these experiments to compare pollinizers in terms of pollen tube growth, fruit set, fruit quality and return bloom. Honeycrisp, Gala, and Fuji cultivars were hand-pollinated by Crabapple, Red Delicious or Golden Delicious pollen. Pollen source had a significant influence on pollen tube growth and pollen tube enrichment in to the base of the style. Golden Delicious pollen had the highest and fastest growth followed by Red Delicious and Crabapple. Crabapple was not an effective pollinizer for Honeycrisp resulting in low fruit set, but both Red Delicious and Golden Delicious were adequate pollinizers of Honeycrisp apples. Pollen tube growth increased overtime after pollination and generally reached the base of the style 96 hours after pollination. ^ Fruit quality attributes and return bloom were generally not affected by pollen source. However, Crabapple pollen resulted in the lowest number of seeds per fruit in all cultivars. Seed number was positively correlated with Gala and Honeycrisp fruit fresh weight regardless of the pollen source. A significantly positive correlation was found between pistil number and seed number indicating that reducing pistil number is an effective experimental tool to regulate seed number. The percent return boom was dramatically decreased with increasing individual fruit fresh weight. Likewise, percent return boom was reduced with increasing seed number per fruit. These results suggest that pollen source and seed number per fruit influence fruit set, fruit quality, and biennial bearing potential of Honeycrisp. This has real world implications for orchard design. Based on our findings, we recommend growers to do not plant Ralph-Shay or Malus floribunda Crabapples as pollinizers for Honeycrisp. Advisors/Committee Members: Peter M. Hirst, Peter M. Hirst, Hazel Wetzstein, Bruce P. Bordelon, Robert E. Pruitt.

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Jahed, K. R. (2015). Male and female interaction in apple: Pollen tube growth, fruit set, fruit quality, and return bloom. (Thesis). Purdue University. Retrieved from http://docs.lib.purdue.edu/open_access_theses/495

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):

Jahed, Khalil Rahman. “Male and female interaction in apple: Pollen tube growth, fruit set, fruit quality, and return bloom.” 2015. Thesis, Purdue University. Accessed March 02, 2021. http://docs.lib.purdue.edu/open_access_theses/495.

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

MLA Handbook (7^th Edition):

Jahed, Khalil Rahman. “Male and female interaction in apple: Pollen tube growth, fruit set, fruit quality, and return bloom.” 2015. Web. 02 Mar 2021.

Vancouver:

Jahed KR. Male and female interaction in apple: Pollen tube growth, fruit set, fruit quality, and return bloom. [Internet] [Thesis]. Purdue University; 2015. [cited 2021 Mar 02]. Available from: http://docs.lib.purdue.edu/open_access_theses/495.

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

Council of Science Editors:

Jahed KR. Male and female interaction in apple: Pollen tube growth, fruit set, fruit quality, and return bloom. [Thesis]. Purdue University; 2015. Available from: http://docs.lib.purdue.edu/open_access_theses/495

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

Purdue University

6. Mitchell, Karen Anne. The effect of biochar on the growth of agricultural weed species.

Degree: MS, Botany and Plant Pathology, 2015, Purdue University

URL: http://docs.lib.purdue.edu/open_access_theses/582

► Biochar, a carbon-rich residue similar to charcoal, has been proposed as a soil amendment to improve soil quality and increase crop yields while simultaneously… (more)

▼ Biochar, a carbon-rich residue similar to charcoal, has been proposed as a soil amendment to improve soil quality and increase crop yields while simultaneously mitigating climate change by the sequestration of carbon. The beneficial effect of biochar on crops may extend to weed species and, although it is well known that weeds reduce crop yields, there is little published research on the effect of biochar on agricultural weed species. In a series of greenhouse and growth chamber experiments, three questions were addressed. First, how does nitrogen interact with biochar produced from a single feedstock to affect weeds? Second, how do differences in biochar feedstock affect root growth and root system architecture? Finally, how do differences in biochar feedstocks affect weed and crop growth? In the first experiment, three common weed species, barnyardgrass (Echinochloa crus-galli L. Beauv.), large crabgrass (Digitaria sanguinalis L. Scop.), and redroot pigweed (Amaranthus retroflexus L.), were grown to maturity under greenhouse conditions using a factorial design with biochar (0 and 2% of the soil dry weight) and nitrogen (0 and 14 g N m-2) treatments. Nitrogen increased barnyardgrass and redroot pigweed total dry weight and large crabgrass panicle dry weight. Biochar increased barnyardgrass height by 22% and total dry weight by 47% but did not affect root : shoot biomass partitioning. Biochar reduced redroot pigweed height by 30% but increased branch dry weight by 95%. Finally, biochar increased large crabgrass shoot dry weight by 34% but reduced root dry weight 30% suggesting that biochar allowed large crabgrass to partition more biomass to shoots than roots. In the second experiment, we examined the effects of two types of biochar on large crabgrass root system architecture using a rhizobox mesocosm. Root growth of large crabgrass varied with the type of biochar used; however, biochar did not affect total plant dry weight. The high-nutrient biochar increased above-ground dry weight and the low-nutrient biochar increased below-ground dry weight when compared to plants grown in the unamended soil. When given a choice between unamended and biochar-amended soil, large crabgrass roots grew preferentially in the biochar-amended soil, regardless of biochar type. In the final experiment, we examined the effect of two types of biochar on the growth of two crop and two weed species grown to maturity under greenhouse conditions. Biochar increased the growth of both crop species suggesting that the incorporation of biochar, especially high-nutrient biochar, into temperate agricultural soils may increase crop yields. However, biochar also increased the growth of both weed species, which may complicate current weed management practices. Overall, this research suggests that biochar has the potential to alter root system architecture and to increase the growth of common weed species. Biochar may therefore exacerbate weed problems in agricultural systems. Advisors/Committee Members: Kevin Gibson, Kevin Gibson, Janna Beckerman, Anjali Iyer-Pascuzzi, Jeff Volenec.

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Mitchell, K. A. (2015). The effect of biochar on the growth of agricultural weed species. (Thesis). Purdue University. Retrieved from http://docs.lib.purdue.edu/open_access_theses/582

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):

Mitchell, Karen Anne. “The effect of biochar on the growth of agricultural weed species.” 2015. Thesis, Purdue University. Accessed March 02, 2021. http://docs.lib.purdue.edu/open_access_theses/582.

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

MLA Handbook (7^th Edition):

Mitchell, Karen Anne. “The effect of biochar on the growth of agricultural weed species.” 2015. Web. 02 Mar 2021.

Vancouver:

Mitchell KA. The effect of biochar on the growth of agricultural weed species. [Internet] [Thesis]. Purdue University; 2015. [cited 2021 Mar 02]. Available from: http://docs.lib.purdue.edu/open_access_theses/582.

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

Council of Science Editors:

Mitchell KA. The effect of biochar on the growth of agricultural weed species. [Thesis]. Purdue University; 2015. Available from: http://docs.lib.purdue.edu/open_access_theses/582

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

Iowa State University

7. Dagna, Nicolas. Application of soil test methods to study the availability of phosphorus in beef cattle manure.

Degree: 2012, Iowa State University

URL: https://lib.dr.iastate.edu/etd/12663

► Characterizing beef cattle (Bos taurus) manure P and its crop availability is essential to improve the utilization of this resource. The objectives of this study… (more)

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Dagna, N. (2012). Application of soil test methods to study the availability of phosphorus in beef cattle manure. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/12663

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):

Dagna, Nicolas. “Application of soil test methods to study the availability of phosphorus in beef cattle manure.” 2012. Thesis, Iowa State University. Accessed March 02, 2021. https://lib.dr.iastate.edu/etd/12663.

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

MLA Handbook (7^th Edition):

Dagna, Nicolas. “Application of soil test methods to study the availability of phosphorus in beef cattle manure.” 2012. Web. 02 Mar 2021.

Vancouver:

Dagna N. Application of soil test methods to study the availability of phosphorus in beef cattle manure. [Internet] [Thesis]. Iowa State University; 2012. [cited 2021 Mar 02]. Available from: https://lib.dr.iastate.edu/etd/12663.

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

Council of Science Editors:

Dagna N. Application of soil test methods to study the availability of phosphorus in beef cattle manure. [Thesis]. Iowa State University; 2012. Available from: https://lib.dr.iastate.edu/etd/12663

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

West Virginia University

8. Wyant, Kolby Denae. Project Knowledge of 4-H Members Who Participated in the Equine Skillathon at the West Virginia State Fair.

Degree: MS, Agricultural & Extension Education, 2013, West Virginia University

URL: https://doi.org/10.33915/etd.349 ; https://researchrepository.wvu.edu/etd/349

► An Equine Skillathon is conducted annually at the West Virginia State Fair in Department F that is open to 4-H and FFA members. At the… (more)

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Wyant, K. D. (2013). Project Knowledge of 4-H Members Who Participated in the Equine Skillathon at the West Virginia State Fair. (Thesis). West Virginia University. Retrieved from https://doi.org/10.33915/etd.349 ; https://researchrepository.wvu.edu/etd/349

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):

Wyant, Kolby Denae. “Project Knowledge of 4-H Members Who Participated in the Equine Skillathon at the West Virginia State Fair.” 2013. Thesis, West Virginia University. Accessed March 02, 2021. https://doi.org/10.33915/etd.349 ; https://researchrepository.wvu.edu/etd/349.

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

MLA Handbook (7^th Edition):

Wyant, Kolby Denae. “Project Knowledge of 4-H Members Who Participated in the Equine Skillathon at the West Virginia State Fair.” 2013. Web. 02 Mar 2021.

Vancouver:

Wyant KD. Project Knowledge of 4-H Members Who Participated in the Equine Skillathon at the West Virginia State Fair. [Internet] [Thesis]. West Virginia University; 2013. [cited 2021 Mar 02]. Available from: https://doi.org/10.33915/etd.349 ; https://researchrepository.wvu.edu/etd/349.

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

Council of Science Editors:

Wyant KD. Project Knowledge of 4-H Members Who Participated in the Equine Skillathon at the West Virginia State Fair. [Thesis]. West Virginia University; 2013. Available from: https://doi.org/10.33915/etd.349 ; https://researchrepository.wvu.edu/etd/349

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

9. Diendéré, Achille. Changement institutionnel, utilisation des produits phytosanitaires et gestion de la qualité de l'eau : le cas de trois zones d'agriculture intensive au Burkina Faso : Institutional change, use of pesticides and management of water resources quality : the case of three areas of intensive agriculture in Burkina Faso.

Degree: Docteur es, Sciences économiques, 2012, Université Toulouse I – Capitole

URL: http://www.theses.fr/2012TOU10042

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L’objectif principal de ce travail de recherche est d’étudier les mécanismes contribuant à accompagner le processus du changement institutionnel pour lutter contre la dégradation de… (more)

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L’objectif principal de ce travail de recherche est d’étudier les mécanismes contribuant à accompagner le processus du changement institutionnel pour lutter contre la dégradation de la qualité de l’eau par l’agriculture au Burkina Faso (BF). La première partie retrace l’évolution de la politique agricole et de celle de l’eau au BF. Elle justifie, également, l’intérêt que nous avons à développer la problématique liée à la dégradation de la qualité de l’eau. La deuxième partie examine les motivations des pratiques des agriculteurs en matière d'utilisation des produits phytosanitaires et offre une réflexion sur les conditions et facteurs d’évolution de ces pratiques. Dans cette partie, en nous appuyant sur les concepts et outils de l’économie institutionnelle (école historique), nous faisons l’hypothèse d’un lien de causalité entre le comportement des agriculteurs et le statut de la ressource en eau et, plus précisément, le statut de la qualité de l’eau. La troisième partie de ce travail cherche à vérifier cette proposition théorique par la collecte et le traitement statistique et économétrique de données obtenues auprès d’un échantillon de 389 agriculteurs appartenant à trois zones agricoles présentant des problématiques de développement agricole différentes. Il ressort qu’une gestion collective de l’eau, appelant à la responsabilisation croissante des agriculteurs dans la protection accrue des ressources en eau est d’autant plus difficile en absence des croyances sur la dégradabilité de la qualité de l’eau. Le changement institutionnel permettant de conduire à l’évolution du statut de la qualité de l’eau n’est ainsi pas réductible à une modification du système légal d’incitations et de sanctions mais dépend, également, des croyances partagées d’agriculteurs membres d’un même collectif. Dès lors, le changement institutionnel étudié dépend de la manière dont les apprentissages sont organisés et impulsés par l’action publique.

The principal objective of this research is to study the mechanisms, which contribute to lead the process of institutional change to avoid water pollution by agriculture in Burkina Faso (BF). Part first of the thesis provides an overview of the evolution of agricultural and water policies in BF. We also discuss the interest of addressing the issue regarding the degradation of water quality from an academic and policy points of view. The second part examines the motivations of farmers' practices in the use of pesticides and the conditions for changes. In this section, based on concepts and tools drawn from institutional economics (the historical school), we make the hypothesis of a causal relationship between the behavior of farmers and the property status of water resources and, more precisely, the property status of water quality. The third part of our thesis attempts to test this theoretical proposition by collecting and analyzing, using statistical and econometric methods, data obtained from 389 farmers located in three different agricultural areas of BF. In this last part, we also draw…

Advisors/Committee Members: Kephaliacos, Charilaos (thesis director), Nguyen, Geneviève (thesis director).

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Diendéré, A. (2012). Changement institutionnel, utilisation des produits phytosanitaires et gestion de la qualité de l'eau : le cas de trois zones d'agriculture intensive au Burkina Faso : Institutional change, use of pesticides and management of water resources quality : the case of three areas of intensive agriculture in Burkina Faso. (Doctoral Dissertation). Université Toulouse I – Capitole. Retrieved from http://www.theses.fr/2012TOU10042

Chicago Manual of Style (16^th Edition):

Diendéré, Achille. “Changement institutionnel, utilisation des produits phytosanitaires et gestion de la qualité de l'eau : le cas de trois zones d'agriculture intensive au Burkina Faso : Institutional change, use of pesticides and management of water resources quality : the case of three areas of intensive agriculture in Burkina Faso.” 2012. Doctoral Dissertation, Université Toulouse I – Capitole. Accessed March 02, 2021. http://www.theses.fr/2012TOU10042.

MLA Handbook (7^th Edition):

Diendéré, Achille. “Changement institutionnel, utilisation des produits phytosanitaires et gestion de la qualité de l'eau : le cas de trois zones d'agriculture intensive au Burkina Faso : Institutional change, use of pesticides and management of water resources quality : the case of three areas of intensive agriculture in Burkina Faso.” 2012. Web. 02 Mar 2021.

Vancouver:

Diendéré A. Changement institutionnel, utilisation des produits phytosanitaires et gestion de la qualité de l'eau : le cas de trois zones d'agriculture intensive au Burkina Faso : Institutional change, use of pesticides and management of water resources quality : the case of three areas of intensive agriculture in Burkina Faso. [Internet] [Doctoral dissertation]. Université Toulouse I – Capitole; 2012. [cited 2021 Mar 02]. Available from: http://www.theses.fr/2012TOU10042.

Council of Science Editors:

Diendéré A. Changement institutionnel, utilisation des produits phytosanitaires et gestion de la qualité de l'eau : le cas de trois zones d'agriculture intensive au Burkina Faso : Institutional change, use of pesticides and management of water resources quality : the case of three areas of intensive agriculture in Burkina Faso. [Doctoral Dissertation]. Université Toulouse I – Capitole; 2012. Available from: http://www.theses.fr/2012TOU10042

University of Debrecen

10. FOUDA MANI, JUSTINE LILIANE. Analysis of the agricultural industry The case of Cameroon .

Degree: DE – ATC – Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási Kar, 2013, University of Debrecen

URL: http://hdl.handle.net/2437/164682

► Agriculture can be definded as an art and a science which includes cultivating the soil at a large scale, brignig up both plants and animals… (more)

Subjects/Keywords: AGRICULTURE

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APA (6^th Edition):

FOUDA MANI, J. L. (2013). Analysis of the agricultural industry The case of Cameroon . (Thesis). University of Debrecen. Retrieved from http://hdl.handle.net/2437/164682

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):

FOUDA MANI, JUSTINE LILIANE. “Analysis of the agricultural industry The case of Cameroon .” 2013. Thesis, University of Debrecen. Accessed March 02, 2021. http://hdl.handle.net/2437/164682.

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

MLA Handbook (7^th Edition):

FOUDA MANI, JUSTINE LILIANE. “Analysis of the agricultural industry The case of Cameroon .” 2013. Web. 02 Mar 2021.

Vancouver:

FOUDA MANI JL. Analysis of the agricultural industry The case of Cameroon . [Internet] [Thesis]. University of Debrecen; 2013. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/2437/164682.

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

Council of Science Editors:

FOUDA MANI JL. Analysis of the agricultural industry The case of Cameroon . [Thesis]. University of Debrecen; 2013. Available from: http://hdl.handle.net/2437/164682

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

11. Kochka, Matthew. STRAWBERRY PRODUCTION IN NEW HAMPSHIRE Strawberry root-lesion nematode, matted-row production, and annual plasticulture compared to matted-row production in New Hampshire.

Degree: MS, 2016, University of New Hampshire

URL: https://scholars.unh.edu/thesis/900

► The dominant strawberry production system in New Hampshire (NH) is the semi-perennial matted-row system. In this system, dormant crowns are planted in the spring… (more)

▼ The dominant strawberry production system in New Hampshire (NH) is the semi-perennial matted-row system. In this system, dormant crowns are planted in the spring and require a full year of maintenance before the first harvest. While as many two additional years of harvests can be realized in this system, strawberry root rot disease effectively limits the productive longevity of matted-row plantings in the state. Root-lesion nematode (Pratylenchus spp.) damage is often cited as a possible factor in facilitating the infection process of the causative pathogen complex of strawberry root rot; but no systematic survey for the presence of Pratylenchus spp. in NH strawberry fields has been undertaken. In the first chapter of this thesis, soil surveys reveal the presence of populations of both P. penetrans (a known pest in the region) and P. vulnus (a root-lesion nematode heretofore undocumented in the state) in strawberry plantings in NH. In the second chapter, five NH strawberry producers were surveyed in an effort to develop an enterprise budget for strawberry operations in the state. The study found that average yield, price paid for strawberry transplants, marketing outlet (u-pick or pre-picked berries), and number of harvest years all significantly affect profitability. Yields ranged widely from 2,750 - 9,000 pounds per bearing acre, with an average of 6,193 lbs/bearing ac (or 1,833 - 6,000 pounds per planted acre, with an average of 4,253 lbs/planted ac). The net return per planted acre ranged from 3,018 - 20,954 (average 10,586). This wide range in net return illustrates the need to investigate the effects of cultural decisions on overall economics. In the third chapter, an alternative production system known as annual plasticulture was evaluated for its potential to increase profitability for NH strawberry growers, relative to matted-row production. In all, two different annual plasticulture systems were evaluated alongside the matted-row system for material inputs, labor requirements, yields, and potential incomes over a period of two seasons. The study indicates that projected three-year average yields, net incomes, and expenses per harvest of both plasticulture systems compare favorably with those of the matted-row system. Specifically, average returns on expenses were estimated to be 205%, 646%, and 197% per year for the one-year June-bearing plasticulture system, the two-year everbearing plasticulture system, and the June-bearing matted-row system, respectively. Advisors/Committee Members: Iago Hale, Becky Sideman, Mike Sciabarrasi.

Subjects/Keywords: Agriculture

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

APA (6^th Edition):

Kochka, M. (2016). STRAWBERRY PRODUCTION IN NEW HAMPSHIRE Strawberry root-lesion nematode, matted-row production, and annual plasticulture compared to matted-row production in New Hampshire. (Thesis). University of New Hampshire. Retrieved from https://scholars.unh.edu/thesis/900

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):

Kochka, Matthew. “STRAWBERRY PRODUCTION IN NEW HAMPSHIRE Strawberry root-lesion nematode, matted-row production, and annual plasticulture compared to matted-row production in New Hampshire.” 2016. Thesis, University of New Hampshire. Accessed March 02, 2021. https://scholars.unh.edu/thesis/900.

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

MLA Handbook (7^th Edition):

Kochka, Matthew. “STRAWBERRY PRODUCTION IN NEW HAMPSHIRE Strawberry root-lesion nematode, matted-row production, and annual plasticulture compared to matted-row production in New Hampshire.” 2016. Web. 02 Mar 2021.

Vancouver:

Kochka M. STRAWBERRY PRODUCTION IN NEW HAMPSHIRE Strawberry root-lesion nematode, matted-row production, and annual plasticulture compared to matted-row production in New Hampshire. [Internet] [Thesis]. University of New Hampshire; 2016. [cited 2021 Mar 02]. Available from: https://scholars.unh.edu/thesis/900.

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

Council of Science Editors:

Kochka M. STRAWBERRY PRODUCTION IN NEW HAMPSHIRE Strawberry root-lesion nematode, matted-row production, and annual plasticulture compared to matted-row production in New Hampshire. [Thesis]. University of New Hampshire; 2016. Available from: https://scholars.unh.edu/thesis/900

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

12. Eaton, Connor. YEAR-ROUND MANAGEMENT OF HIGH TUNNEL PRODUCTION SYSTEMS: SPINACH AND TOMATO.

Degree: MS, 2016, University of New Hampshire

URL: https://scholars.unh.edu/thesis/1088

► As high tunnel production is relatively new to the Northeast, this research has helped understand knowledge-gaps in common warm and cold-season crop systems in… (more)

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Eaton, C. (2016). YEAR-ROUND MANAGEMENT OF HIGH TUNNEL PRODUCTION SYSTEMS: SPINACH AND TOMATO. (Thesis). University of New Hampshire. Retrieved from https://scholars.unh.edu/thesis/1088

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):

Eaton, Connor. “YEAR-ROUND MANAGEMENT OF HIGH TUNNEL PRODUCTION SYSTEMS: SPINACH AND TOMATO.” 2016. Thesis, University of New Hampshire. Accessed March 02, 2021. https://scholars.unh.edu/thesis/1088.

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

MLA Handbook (7^th Edition):

Eaton, Connor. “YEAR-ROUND MANAGEMENT OF HIGH TUNNEL PRODUCTION SYSTEMS: SPINACH AND TOMATO.” 2016. Web. 02 Mar 2021.

Vancouver:

Eaton C. YEAR-ROUND MANAGEMENT OF HIGH TUNNEL PRODUCTION SYSTEMS: SPINACH AND TOMATO. [Internet] [Thesis]. University of New Hampshire; 2016. [cited 2021 Mar 02]. Available from: https://scholars.unh.edu/thesis/1088.

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

Council of Science Editors:

Eaton C. YEAR-ROUND MANAGEMENT OF HIGH TUNNEL PRODUCTION SYSTEMS: SPINACH AND TOMATO. [Thesis]. University of New Hampshire; 2016. Available from: https://scholars.unh.edu/thesis/1088

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

13. Rice, Emily Margaret. SUPPLEMENTATION OF SODIUM BUTYRATE TO POST-WEANED HEIFER DIETS: EFFECTS ON GROWTH PERFORMANCE, NUTRIENT DIGESTIBILITY, AND HEALTH.

Degree: MS, 2017, University of New Hampshire

URL: https://scholars.unh.edu/thesis/1162

► The objective of this study was to determine the effect of varying levels of sodium, butyrate (SB) on the growth, digestibility, and health of post-weaned… (more)

▼ The objective of this study was to determine the effect of varying levels of sodium, butyrate (SB) on the growth, digestibility, and health of post-weaned heifers. Forty Holstein, dairy heifers with a mean age of 84 d and average body weight (BW) of 100.88 kg were housed, in a naturally ventilated freestall barn. Heifers were blocked by birth date and randomly assigned, to 1 of 4 treatments in a completely randomized block design: (1) 100 g of soybean meal carrier, (control; CON); (2) 0.25 g SB/kg of body weight + carrier (0.25SB); (3) 0.50 g SB/kg of BW +, carrier (0.50SB); (4) (0.75 g SB/kg of BW + carrier (0.75SB). Treatments were top-dressed and, hand-mixed into a total mixed ration (TMR) once daily. Heifers had free access to water. Initial, BW, hip and withers heights, heart girth and body length were measured before the start of the, study and every week thereafter until the 15 wk trial was over. Blood samples were obtained and, plasma urea nitrogen, glucose, and β-hydroxybutyrate (BHB) concentrations were determined, prior to the start of treatment and weekly after until the conclusion of the study. Fecal samples, were taken prior to treatment and every other week from each heifer for coccidia counts., Apparent total-tract nutrient digestibility was determined utilizing a chromium oxide marker., Each heifer underwent this phase at 47 d on study until 54 d on study. Sodium butyrate appeared, to increase the digestibility of acid detergent fiber (ADF) and organic matter (OM) (P = 0.08; P, = 0.07, respectively). Sodium butyrate had a positive effect on average BW and overall BW gain., Sodium butyrate had no performance effects on skeletal growth or blood metabolites. Average, daily gains were 1.16, 1.15, 1.17, and 1.24 kg/d (P = 0.12) and daily dry matter intakes (DMI), were 5.09, 4.84, 5.19, and 4.91 kg/d (P = 0.85) for CON, 0.25SB, 0.50SB, and 0.75SB,, respectively. There was a trend towards improved feed efficiency (FE). Fecal samples from each, heifer indicated the presence of coccidian, but the counts were variable within blocks and not, consistent across heifers within each pen. There was a trend towards positive feed efficiency., Sodium butyrate supplementation offers positive results in the growth performance and feed, efficiency of post-weaned heifers. Advisors/Committee Members: Peter S Erickson, Andre F Brito, William E Berndtson.

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Rice, E. M. (2017). SUPPLEMENTATION OF SODIUM BUTYRATE TO POST-WEANED HEIFER DIETS: EFFECTS ON GROWTH PERFORMANCE, NUTRIENT DIGESTIBILITY, AND HEALTH. (Thesis). University of New Hampshire. Retrieved from https://scholars.unh.edu/thesis/1162

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):

Rice, Emily Margaret. “SUPPLEMENTATION OF SODIUM BUTYRATE TO POST-WEANED HEIFER DIETS: EFFECTS ON GROWTH PERFORMANCE, NUTRIENT DIGESTIBILITY, AND HEALTH.” 2017. Thesis, University of New Hampshire. Accessed March 02, 2021. https://scholars.unh.edu/thesis/1162.

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

MLA Handbook (7^th Edition):

Rice, Emily Margaret. “SUPPLEMENTATION OF SODIUM BUTYRATE TO POST-WEANED HEIFER DIETS: EFFECTS ON GROWTH PERFORMANCE, NUTRIENT DIGESTIBILITY, AND HEALTH.” 2017. Web. 02 Mar 2021.

Vancouver:

Rice EM. SUPPLEMENTATION OF SODIUM BUTYRATE TO POST-WEANED HEIFER DIETS: EFFECTS ON GROWTH PERFORMANCE, NUTRIENT DIGESTIBILITY, AND HEALTH. [Internet] [Thesis]. University of New Hampshire; 2017. [cited 2021 Mar 02]. Available from: https://scholars.unh.edu/thesis/1162.

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

Council of Science Editors:

Rice EM. SUPPLEMENTATION OF SODIUM BUTYRATE TO POST-WEANED HEIFER DIETS: EFFECTS ON GROWTH PERFORMANCE, NUTRIENT DIGESTIBILITY, AND HEALTH. [Thesis]. University of New Hampshire; 2017. Available from: https://scholars.unh.edu/thesis/1162

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

Auburn University

14. Doukopoulos, Alexandros. Characterization of New Populations in Sunn Hemp (Crotalaria juncea L.) and Relationship of Their Traits to Yield .

Degree: 2012, Auburn University

URL: http://hdl.handle.net/10415/2995

► Sunn hemp (Crotalaria juncea L.) is a short-day, erect shrubby annual, generally 1 to 4 m in height. It is a candidate species for crop… (more)

▼ Sunn hemp (Crotalaria juncea L.) is a short-day, erect shrubby annual, generally 1 to 4 m in height. It is a candidate species for crop rotation schemes as a means of weed suppression and as a green manure crop to improve soils and reduce root-knot nematode (Meloidogyne spp.) infestations. An ongoing breeding program has resulted in a locally adapted population, ‘Selection PBU,’ that varies significantly from the non-adapted ones. In 2007 a field study was undertaken, using two cycles of selection, in order to determine the correlation between juvenile and mature-plant traits and to evaluate the effect of young plant selection on forage yield and other mature-plant traits. Furthermore, several cycles of breeding populations, their parental material and the tropical cultivar ‘Tropic Sun’, for a total of eight populations, were tested in Alabama in 2008 and 2009. Their morphological characteristics were evaluated to identify how the changes in photoperiodicity requirements affected the more recent selection cycles compared to their parental populations. Additionally, germination and growth chamber studies were conducted to determine the effect of temperature and genotype on seedling emergence and early plant growth. Our results indicated that selecting for traits, such as height and number of leaves at four weeks can significantly improve biomass, both at flowering and harvesting time, as well as seed yield. There is potential for future selections to reach higher uniformity, as shown by the higher heritability values for the latest selection cycle compared to the more recent one. Applying equal selection intensity as an even split of 31.6% among, and 31.6% within, family selection, produces the largest genetic gain. Selection PBU was the best or among the best populations for morphological characteristics important for the release of a cultivar in a temperate environment. The most important characteristics were number of days until flowering, days until harvesting, biomass and seed weight, as well as seed quality. The variety ‘‘Tropic Sun’’ was the poorest performer since it produced excessive vegetative matter, very few flowers and no seed. The breeding program has been successful in producing plants that are not photoperiodic and they have become adapted to the sub-tropical conditions of the Southeast. In the process, the plants have become more compact, and they flower and are ready for harvest much earlier than their parental populations. This has allowed producing sufficient amounts of good quality seed to allow for seed-increase and for the continuation of the breeding cycles. Advisors/Committee Members: Mosjidis, Jorge (advisor).

Subjects/Keywords: Agriculture

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

APA (6^th Edition):

Doukopoulos, A. (2012). Characterization of New Populations in Sunn Hemp (Crotalaria juncea L.) and Relationship of Their Traits to Yield . (Doctoral Dissertation). Auburn University. Retrieved from http://hdl.handle.net/10415/2995

Chicago Manual of Style (16^th Edition):

Doukopoulos, Alexandros. “Characterization of New Populations in Sunn Hemp (Crotalaria juncea L.) and Relationship of Their Traits to Yield .” 2012. Doctoral Dissertation, Auburn University. Accessed March 02, 2021. http://hdl.handle.net/10415/2995.

MLA Handbook (7^th Edition):

Doukopoulos, Alexandros. “Characterization of New Populations in Sunn Hemp (Crotalaria juncea L.) and Relationship of Their Traits to Yield .” 2012. Web. 02 Mar 2021.

Vancouver:

Doukopoulos A. Characterization of New Populations in Sunn Hemp (Crotalaria juncea L.) and Relationship of Their Traits to Yield . [Internet] [Doctoral dissertation]. Auburn University; 2012. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10415/2995.

Council of Science Editors:

Doukopoulos A. Characterization of New Populations in Sunn Hemp (Crotalaria juncea L.) and Relationship of Their Traits to Yield . [Doctoral Dissertation]. Auburn University; 2012. Available from: http://hdl.handle.net/10415/2995

University of Hawaii – Manoa

15. Bundhuwong, Chalita. Economic life of Malay Muslims in southernmost Thailand amidst ecological changes and unrest.

Degree: 2016, University of Hawaii – Manoa

URL: http://hdl.handle.net/10125/100577

►

Ph.D. University of Hawaii at Manoa 2013.

The economic life of rural Malay Muslims in Kampong Ai Hetae in southernmost Thailand is examined. The affects… (more)

▼

Ph.D. University of Hawaii at Manoa 2013.

The economic life of rural Malay Muslims in Kampong Ai Hetae in southernmost Thailand is examined. The affects of the politics of Thai state development on the ecosystem is explored together with local farming practices and resource uses amidst ecological changes, the market economy, conflict and violence. This dissertation also relates agriculture to other dimensions of rural transformation to understand economic life. The dissertation research revealed that economic development in the region has aimed to stabilize Thai nation-state ideology under the assumption that poverty is the main cause of the civil unrest. However, the development, which aims to incorporate Malay Muslim identity and ignores ecological values and the meaningful participation of local residents, has not been successful in suppressing the unrest nor in improving the economic life. Local residents have adapted farming practices to try to continue to use the changing ecological system and also to pursue new economic incentives. While trying to cope with unsupportive development and intermittent violence, the local residents face many serious risks all alone. The use of chemicals in farming and conflicts over common resources seem unavoidable. Agriculture is the foundation for households to gain better opportunities in the non-farm sector in the face of the rural transformations in the region. Modern lifestyle and consumption can't be separated from investment in farming. The intensification of Islam strengthened by the robust commercial farming in turn shapes the community's political power reproducing the failure of development. The local economic life is full of ups and downs although not destitute. However, increasing pressure on the land with population growth is unsustainable even with increasing involvement in non-farm activities, and it will bring more difficulties in the future. Even if development were sustainable and the rural poor could cultivate new skills, education, and networks for employment in non-farming jobs, the quality of life of local residents will still be depreciated if the conflicts continue in the south. Quality of life is not only economic, but also ecological, cultural, and political, and it will be diminished as long as the development is under the Thai nation-state ideology.

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Bundhuwong, C. (2016). Economic life of Malay Muslims in southernmost Thailand amidst ecological changes and unrest. (Thesis). University of Hawaii – Manoa. Retrieved from http://hdl.handle.net/10125/100577

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):

Bundhuwong, Chalita. “Economic life of Malay Muslims in southernmost Thailand amidst ecological changes and unrest.” 2016. Thesis, University of Hawaii – Manoa. Accessed March 02, 2021. http://hdl.handle.net/10125/100577.

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

MLA Handbook (7^th Edition):

Bundhuwong, Chalita. “Economic life of Malay Muslims in southernmost Thailand amidst ecological changes and unrest.” 2016. Web. 02 Mar 2021.

Vancouver:

Bundhuwong C. Economic life of Malay Muslims in southernmost Thailand amidst ecological changes and unrest. [Internet] [Thesis]. University of Hawaii – Manoa; 2016. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10125/100577.

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

Council of Science Editors:

Bundhuwong C. Economic life of Malay Muslims in southernmost Thailand amidst ecological changes and unrest. [Thesis]. University of Hawaii – Manoa; 2016. Available from: http://hdl.handle.net/10125/100577

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

Cal Poly

16. Adams, Kimberly Ellen. Influence of Vineyard Floor Management Practices on Soil Aggregate Stability, Total Soil Carbon and Grapevine Yield.

Degree: MS, 2011, Cal Poly

URL: https://digitalcommons.calpoly.edu/theses/612 ; 10.15368/theses.2011.170

► Soil aggregates provide pore spaces of various sizes supplying water, gases and nutrients to plant roots and microorganisms, and facilitate moisture retention and availability.… (more)

▼ Soil aggregates provide pore spaces of various sizes supplying water, gases and nutrients to plant roots and microorganisms, and facilitate moisture retention and availability. Soil aggregate stability is indicative of soil biological and structural health, and is increased by soil carbon derived from plant roots and the soil microbial biomass. Aggregate stability and soil carbon can be enhanced by increasing organic matter through compost additions or by planting cover crops. Additionally, aggregate stability is enhanced by arbuscular mycorrhizal fungi (AMF) that form a symbiotic association with plant roots, and consolidate soil particles into aggregates through hyphal networks and through the production of glomalin, binding soil particles together. The use of herbicides decreases soil carbon as it removes vegetation and the microorganisms associated with it. Soils having poor aggregate stability slake and disperse into primary soil particles becoming dense and subject to erosion when exposed to heavy rains. The use of herbicides amplifies this risk as it removes vegetation, leaving the soil bare, with nothing to absorb rainfall impact. The effect of vineyard floor management practices on aggregate stability, soil carbon and grapevine fruit yield was studied at two vineyard sites located within the Estrella district of Paso Robles, CA. In late fall of 2008, treatments were applied to the vine line including an herbicide, an herbicide plus compost, a cover crop, a cover crop plus compost and a cover crop plus a fungal inoculant treatment. The control had no herbicides, compost, cover crop, or fungal inoculant applied to it. The cover crop treatments were applied at 30 lbs/ac consisting of a mixture of 20 % blando brome (Bromus hordeaceus), 20 % Zorro fescue (Vulpia myuros), 30 % crimson clover (Trifolium incarnatum) and 30 % subterranean clover (Trifolium subterraneum). Commercially available compost was applied at a rate of five tons per acre. The fungal inoculant was applied at eight pounds per acre, consisting of the AMF: Glomus intraradices, G. mosseae, G. aggregatum and G. etunicatum each at 32 propagules/ cc. Samples were collected in the spring of 2009 and the winter of 2010. Percent carbon was significantly higher in the areas where compost applications were received (P=0.014). Cover crops did not significantly increase the level of carbon in the soil (P=0.253). Compost and cover crops significantly increased the amount of > 4.0 mm soil aggregates (P=0.004 for compost and P=0.027 for cover crops). Herbicide treatments significantly reduced the amount of > 4.0 mm aggregates (P=0.028). Fungal inoculants had no effect on > 4.0 mm aggregate stability (P=0.361). Compost significantly increased mean fruit weight (P=0.041). These results suggest that the addition of compost and cover crops are an effective… Advisors/Committee Members: Thomas J. Rice.

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Adams, K. E. (2011). Influence of Vineyard Floor Management Practices on Soil Aggregate Stability, Total Soil Carbon and Grapevine Yield. (Masters Thesis). Cal Poly. Retrieved from https://digitalcommons.calpoly.edu/theses/612 ; 10.15368/theses.2011.170

Chicago Manual of Style (16^th Edition):

Adams, Kimberly Ellen. “Influence of Vineyard Floor Management Practices on Soil Aggregate Stability, Total Soil Carbon and Grapevine Yield.” 2011. Masters Thesis, Cal Poly. Accessed March 02, 2021. https://digitalcommons.calpoly.edu/theses/612 ; 10.15368/theses.2011.170.

MLA Handbook (7^th Edition):

Adams, Kimberly Ellen. “Influence of Vineyard Floor Management Practices on Soil Aggregate Stability, Total Soil Carbon and Grapevine Yield.” 2011. Web. 02 Mar 2021.

Vancouver:

Adams KE. Influence of Vineyard Floor Management Practices on Soil Aggregate Stability, Total Soil Carbon and Grapevine Yield. [Internet] [Masters thesis]. Cal Poly; 2011. [cited 2021 Mar 02]. Available from: https://digitalcommons.calpoly.edu/theses/612 ; 10.15368/theses.2011.170.

Council of Science Editors:

Adams KE. Influence of Vineyard Floor Management Practices on Soil Aggregate Stability, Total Soil Carbon and Grapevine Yield. [Masters Thesis]. Cal Poly; 2011. Available from: https://digitalcommons.calpoly.edu/theses/612 ; 10.15368/theses.2011.170

University of Tennessee – Knoxville

17. Richardson, Lauren Kathryn. Evaluation of agronomic, seed quality traits, and transcript abundance in conventional high oleic soybeans with mutant FAD2-1A and FAD2-1B genes.

Degree: MS, Plant Sciences, 2016, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_gradthes/3800

► Two soybean omega-6 fatty acid desaturase genes [FAD2-1A and FAD2- 1B] are responsible for converting oleic acid into linoleic acid (Okuley et al., 1994).… (more)

▼ Two soybean omega-6 fatty acid desaturase genes [FAD2-1A and FAD2- 1B] are responsible for converting oleic acid into linoleic acid (Okuley et al., 1994). Plant introductions [PI] 603452 and 283327 have naturally occurring mutations in FAD2-1A and FAD2-1B, respectively, which hinder the conversion of oleic acid to polyunsaturated fatty acids. The end result is more functional soybean oil with exceptionally high levels of oleic acid. The homozygous alleles of FAD2-1A and FAD2-1B were combined in a BC₃F_2:4 [backcross three, second filial generation selected, advanced to the fourth filial generation] population of forty-eight lines and were evaluated in Tennessee. Each line belonged to a double homozygous genotypic class: i) double wild-type [WT] (AABB), ii) mutant FAD2-1A with WT FAD2-1B (aaBB), iii) the converse (AAbb), and iv) double mutant (aabb). All genotypic groups yielded similarly to each other and to three high yielding checks (p<0.05). When one mutant allele was present the high oleic content was increased significantly (aaBB-34.4% and AAbb-26.2%) compared to AABB-21.3%. When both mutations were combined, aabb, the mean oleic content was significantly greater (p<0.05) than all other genotypic groups (80.4%). The range of oleic acid content across all twelve double mutant groups was 77.1% - 81.8%. It appears that the high oleic genotype has a significant effect on total oil, crude protein, and the concentration of five amino acids. The aabb group had significantly more oil (240 ± 1 g kg^-1) and crude protein (400 ± 7 g kg^-1) than all other groups. This increase in crude protein is consistent with the significantly lowered amino acid concentration (p<0.05) of lysine, methionine, tryptophan, and threonine in the aabb group. Conversely, the high oleic group had the greatest concentration of cysteine (p<0.05). It appears that mutant FAD2-1 genes from PI 603452 and PI 283327 are a useful source for developing high oleic soybean lines in Tennessee with no yield drag. It will be beneficial to explore the effect of these mutant alleles on total oil and protein in the future. Advisors/Committee Members: Vincent R. Pantalone, Hem Bhandari, Feng Chen, Tarek Hewezi.

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Richardson, L. K. (2016). Evaluation of agronomic, seed quality traits, and transcript abundance in conventional high oleic soybeans with mutant FAD2-1A and FAD2-1B genes. (Thesis). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_gradthes/3800

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):

Richardson, Lauren Kathryn. “Evaluation of agronomic, seed quality traits, and transcript abundance in conventional high oleic soybeans with mutant FAD2-1A and FAD2-1B genes.” 2016. Thesis, University of Tennessee – Knoxville. Accessed March 02, 2021. https://trace.tennessee.edu/utk_gradthes/3800.

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

MLA Handbook (7^th Edition):

Richardson, Lauren Kathryn. “Evaluation of agronomic, seed quality traits, and transcript abundance in conventional high oleic soybeans with mutant FAD2-1A and FAD2-1B genes.” 2016. Web. 02 Mar 2021.

Vancouver:

Richardson LK. Evaluation of agronomic, seed quality traits, and transcript abundance in conventional high oleic soybeans with mutant FAD2-1A and FAD2-1B genes. [Internet] [Thesis]. University of Tennessee – Knoxville; 2016. [cited 2021 Mar 02]. Available from: https://trace.tennessee.edu/utk_gradthes/3800.

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

Council of Science Editors:

Richardson LK. Evaluation of agronomic, seed quality traits, and transcript abundance in conventional high oleic soybeans with mutant FAD2-1A and FAD2-1B genes. [Thesis]. University of Tennessee – Knoxville; 2016. Available from: https://trace.tennessee.edu/utk_gradthes/3800

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

University of Tennessee – Knoxville

18. Chu, Mingwei. Effect of Different Cover Crop Species on Crop Production and Soil Health.

Degree: MS, Environmental and Soil Sciences, 2017, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_gradthes/4917

► Integration of cover crops (CCs) can provide several benefits to row crop production systems. Comprehensive studies to understand the effectiveness of a mixture of… (more)

▼ Integration of cover crops (CCs) can provide several benefits to row crop production systems. Comprehensive studies to understand the effectiveness of a mixture of CCs versus single or double species CCs are limited. In this study, we evaluated the effect of single and double species CCs, and the soil health mix (SHM, a combination of five species recommended by the United States Department of Agriculture) on soil quality attributes and crop production in western Tennessee. The results showed an increase in soybean yield after 3-years of SHM treatment, which corresponded with significantly higher soil moisture content and soil inorganic nitrogen content compared to less diverse CC treatments and no-cover control. Overall the multi-species SHM showed potential for enhancing soil quality and crop yield. The Haney’s soil health test is a new approach to quantify the soil health status with heavy emphasis on soil biological properties. It introduced a new extractant for determining soil available nutrients, H3A; a new method of soil respiration measurement using Solvita gel system; and two new soil bioavailability parameters: water extractable organic carbon (WEOC) and water extractable organic nitrogen (WEON). The final Haney soil health score is calculated from the Solvita respiration, WEOC and WEON. In this study, components in Haney’s soil health test were evaluated to test their effectiveness in Tennessee soils. The H3A extractant showed significant but weak correlation with the traditional extractants such as Mehlich-1 and Mehlich-3. The Solvita test did not provide a reliable estimation of potential mineralizable nitrogen, however, it correlated with many soil properties including soil carbon and nitrogen pools as well as the WEOC and WEON. Although the soil health score showed some extent of sensitivity to long-term cover crop treatments, it did not capture the variation in soil health status after 4 years of cover cropping with different species of cover crops. This study is a first step towards simultaneous suitability evaluation of a suite of CCs for improving the sustainability of the agricultural belt of Tennessee. More similar studies are needed to help farmers make informed decisions of CC species selection for their cropping systems. Advisors/Committee Members: Forbes Walker, Sindhu Jagadamma, Neal S. Eash.

Subjects/Keywords: Agriculture

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

APA (6^th Edition):

Chu, M. (2017). Effect of Different Cover Crop Species on Crop Production and Soil Health. (Thesis). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_gradthes/4917

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):

Chu, Mingwei. “Effect of Different Cover Crop Species on Crop Production and Soil Health.” 2017. Thesis, University of Tennessee – Knoxville. Accessed March 02, 2021. https://trace.tennessee.edu/utk_gradthes/4917.

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

MLA Handbook (7^th Edition):

Chu, Mingwei. “Effect of Different Cover Crop Species on Crop Production and Soil Health.” 2017. Web. 02 Mar 2021.

Vancouver:

Chu M. Effect of Different Cover Crop Species on Crop Production and Soil Health. [Internet] [Thesis]. University of Tennessee – Knoxville; 2017. [cited 2021 Mar 02]. Available from: https://trace.tennessee.edu/utk_gradthes/4917.

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

Council of Science Editors:

Chu M. Effect of Different Cover Crop Species on Crop Production and Soil Health. [Thesis]. University of Tennessee – Knoxville; 2017. Available from: https://trace.tennessee.edu/utk_gradthes/4917

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

University of Tennessee – Knoxville

19. Lane, Jennifer Kay. Establishing a Fall Harvest Window for Switchgrass Biomass Based on Optimum Decline of Phosphorus and Potassium Levels in Shoots.

Degree: MS, Plant Sciences, 2011, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_gradthes/994

► Switchgrass (Panicum virgatum) is a perennial grass that remobilizes nutrients during senescence and is being used as biomass for cellulosic ethanol production. Phosphorus (P)… (more)

▼ Switchgrass (Panicum virgatum) is a perennial grass that remobilizes nutrients during senescence and is being used as biomass for cellulosic ethanol production. Phosphorus (P) and potassium (K) are removed in harvested biomass and replenished through additions of fertilizer. Identifying the appropriate harvest window in a one-cut system based on the remobilization of nutrients can be economically beneficial for biomass producers. The primary objective of this research was to determine if a one-cut harvest can be executed earlier in the fall based on the remobilization of P and K from stems and leaves to crown and roots of plants. Better harvesting conditions and reduced nutrient removal rates are potential benefits of earlier harvest. This project consisted of three parts, evaluating: (1) P and K levels in shoots and whole plants of Alamo and Kanlow cultivars, (2) P and K levels in shoots of upland and lowland switchgrass varieties, and (3) Effects of earlier harvest on yield. Twelve varieties, including ‘Alamo’ and ‘Kanlow’ cultivars, were planted in Knoxville, TN in 2007. Eight of these varieties were planted in Springfield, TN. Above and belowground samples were collected throughout the fall and analyzed for P and K concentrations. No significant declines of P and K were observed in stems and leaves from early October through November. Levels of P and K in leaves, stems, and panicles fluctuated during the fall season; however, final levels were similar in all tissues. Based on these changes in aboveground biomass, the harvest window could begin as early as mid-September. Data suggested that P and K in Alamo and Kanlow followed similar patterns through the fall, without significant declines in shoots. This is confirmed by data from whole plants, which showed no significant increases in P and K in crowns and roots. Levels of P and K in varieties of upland and lowland switchgrass did not differ and followed patterns observed in Alamo and Kanlow. Yields observed in different varieties did not decline when harvested as early as mid-September. Based solely on this study, it is not necessary to delay harvest and could take place as early as September. Advisors/Committee Members: Fred L. Allen, Carl E. Sams, Donald D. Tyler, William E. Hart, Jerome F. Grant.

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Lane, J. K. (2011). Establishing a Fall Harvest Window for Switchgrass Biomass Based on Optimum Decline of Phosphorus and Potassium Levels in Shoots. (Thesis). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_gradthes/994

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):

Lane, Jennifer Kay. “Establishing a Fall Harvest Window for Switchgrass Biomass Based on Optimum Decline of Phosphorus and Potassium Levels in Shoots.” 2011. Thesis, University of Tennessee – Knoxville. Accessed March 02, 2021. https://trace.tennessee.edu/utk_gradthes/994.

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

MLA Handbook (7^th Edition):

Lane, Jennifer Kay. “Establishing a Fall Harvest Window for Switchgrass Biomass Based on Optimum Decline of Phosphorus and Potassium Levels in Shoots.” 2011. Web. 02 Mar 2021.

Vancouver:

Lane JK. Establishing a Fall Harvest Window for Switchgrass Biomass Based on Optimum Decline of Phosphorus and Potassium Levels in Shoots. [Internet] [Thesis]. University of Tennessee – Knoxville; 2011. [cited 2021 Mar 02]. Available from: https://trace.tennessee.edu/utk_gradthes/994.

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

Council of Science Editors:

Lane JK. Establishing a Fall Harvest Window for Switchgrass Biomass Based on Optimum Decline of Phosphorus and Potassium Levels in Shoots. [Thesis]. University of Tennessee – Knoxville; 2011. Available from: https://trace.tennessee.edu/utk_gradthes/994

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

20. hong, seukmin. Evaluation of Genetic Diversity and Stability of Colocasia Cultivars Using ISSR.

Degree: MS- Agriculture, Agriculture, 2017, Stephen F. Austin State University

URL: https://scholarworks.sfasu.edu/etds/129

► Using 44 ornamental Colocasia cultivars planted at Stephen F. Austin State University (Nacogdoches, TX), cultivar assessment, genetic diversity, stability, and relationship were examined with… (more)

Subjects/Keywords: Agriculture

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APA (6^th Edition):

hong, s. (2017). Evaluation of Genetic Diversity and Stability of Colocasia Cultivars Using ISSR. (Masters Thesis). Stephen F. Austin State University. Retrieved from https://scholarworks.sfasu.edu/etds/129

Chicago Manual of Style (16^th Edition):

hong, seukmin. “Evaluation of Genetic Diversity and Stability of Colocasia Cultivars Using ISSR.” 2017. Masters Thesis, Stephen F. Austin State University. Accessed March 02, 2021. https://scholarworks.sfasu.edu/etds/129.

MLA Handbook (7^th Edition):

hong, seukmin. “Evaluation of Genetic Diversity and Stability of Colocasia Cultivars Using ISSR.” 2017. Web. 02 Mar 2021.

Vancouver:

hong s. Evaluation of Genetic Diversity and Stability of Colocasia Cultivars Using ISSR. [Internet] [Masters thesis]. Stephen F. Austin State University; 2017. [cited 2021 Mar 02]. Available from: https://scholarworks.sfasu.edu/etds/129.

Council of Science Editors:

hong s. Evaluation of Genetic Diversity and Stability of Colocasia Cultivars Using ISSR. [Masters Thesis]. Stephen F. Austin State University; 2017. Available from: https://scholarworks.sfasu.edu/etds/129

21. Brock, Ian. The Effects Of Different Amino Acid Concentrations, With Or Without Chromium Supplementation, On The Performance And Yield Of Commercial Broiler Chickens Fed Two Different Feeding Programs.

Degree: MS- Agriculture, Agriculture, 2020, Stephen F. Austin State University

URL: https://scholarworks.sfasu.edu/etds/288

► Abstract The objective of this study was to evaluate performance parameters and meat yield of commercial broiler chickens fed diets with different amino acid… (more)

▼ Abstract The objective of this study was to evaluate performance parameters and meat yield of commercial broiler chickens fed diets with different amino acid concentrations, with or without chromium supplementation, and delivered through two different feeding programs over 54 days. The experimental study was completed as a randomized-block design with 4,800, Ross 708 X Ross 708 commercial broiler chickens, picked at random, and evenly divided into six treatment groups (800 birds per group). Treatments 1 and 4 where placed under feeding program (FP1). Treatments 2, 3, 5, and 6 where placed under a different feeding program (FP2). Three different feed formulations were used, treatments 1 and 4 received formulation (A), treatments 2 and 5 received formulation (B), and treatments 3 and 6 received formulation (C). The treatments 1, 2, and 3 did not receive chromium (NC), while treatments 4, 5, and 6 did receive chromium (C). These birds were reared in 96, 5’X10’ (50 ft²) floor pens, at a stocking density of 1.00 ft²/bird (50 birds per pen). Throughout the duration of the trial bird performance was measured. Average body weight, feed conversion ratio, feed consumed, and percent mortality was collected at the change of each feed phase. From the results of this study there was no significant effect on broiler performance from the supplementation of chromium, feed formulation, and feeding program. Although, the results on Table 14 from the yield study shows that treatment 2 was significantly different from treatments 1, 3, and 4 in front half carcass weight, however, was not significantly different from treatments 5 and 6. Table 14 results also show treatment 2 having significant differences from treatments 1 and 4 in breast meat yield, however was not significantly different from treatments 3, 5, and 6. However, there is a possibility that these areas of significance in the yield study could be false positives found in the data of this single trial. Additional studies should be conducted to further the assumption if there is an actual significant difference between the treatments. Advisors/Committee Members: Joey Bray, Stephen Kosovich, John Michael Mehaffey.

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Brock, I. (2020). The Effects Of Different Amino Acid Concentrations, With Or Without Chromium Supplementation, On The Performance And Yield Of Commercial Broiler Chickens Fed Two Different Feeding Programs. (Masters Thesis). Stephen F. Austin State University. Retrieved from https://scholarworks.sfasu.edu/etds/288

Chicago Manual of Style (16^th Edition):

Brock, Ian. “The Effects Of Different Amino Acid Concentrations, With Or Without Chromium Supplementation, On The Performance And Yield Of Commercial Broiler Chickens Fed Two Different Feeding Programs.” 2020. Masters Thesis, Stephen F. Austin State University. Accessed March 02, 2021. https://scholarworks.sfasu.edu/etds/288.

MLA Handbook (7^th Edition):

Brock, Ian. “The Effects Of Different Amino Acid Concentrations, With Or Without Chromium Supplementation, On The Performance And Yield Of Commercial Broiler Chickens Fed Two Different Feeding Programs.” 2020. Web. 02 Mar 2021.

Vancouver:

Brock I. The Effects Of Different Amino Acid Concentrations, With Or Without Chromium Supplementation, On The Performance And Yield Of Commercial Broiler Chickens Fed Two Different Feeding Programs. [Internet] [Masters thesis]. Stephen F. Austin State University; 2020. [cited 2021 Mar 02]. Available from: https://scholarworks.sfasu.edu/etds/288.

Council of Science Editors:

Brock I. The Effects Of Different Amino Acid Concentrations, With Or Without Chromium Supplementation, On The Performance And Yield Of Commercial Broiler Chickens Fed Two Different Feeding Programs. [Masters Thesis]. Stephen F. Austin State University; 2020. Available from: https://scholarworks.sfasu.edu/etds/288

22. Lamb, Alyssa. The Current Status and Control of Horseweed (Conyza canadensis) in Ohio Soybean (Glycine max) Production.

Degree: MS, Horticulture and Crop Science, 2018, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1523877602007281

► Studies were conducted from 2013 through 2017 with the objectives of: 1) optimizing a cereal rye cover crop program for the control of glyphosate-resistant (GR)… (more)

▼ Studies were conducted from 2013 through 2017 with the objectives of: 1) optimizing a cereal rye cover crop program for the control of glyphosate-resistant (GR) horseweed in soybean production; and 2) determining the frequency, infestation level, and distribution of some of the most common and troublesome weeds in Ohio soybean fields as well as the spatial and temporal distribution of horseweed populations.Two studies were conducted simultaneously from fall of 2016 to fall of 2017 to evaluate how the planting date and seeding rate of a cereal rye cover crop affect horseweed population density, and the utility of cereal rye to aid or replace control from spring preplant residual (Study I) or fall herbicides (Study II). There was no difference in horseweed population density as a result of rye planting date in either study. The rye seeding rate affected horseweed density throughout the season in both studies. Horseweed density was greater in the absence of rye compared to either seeding rate. In Study I, the flumioxazin + metribuzin spring preplant residual reduced horseweed density in June compared with no or low level residual. In July, the flumioxazin + metribuzin treatments had a reduced horseweed density compared to the nontreated, but the flumioxazin alone was not different than the mixture or nontreated. In Study II, the fall herbicide treatment reduced horseweed density until July compared with the absence of a fall treatment. These results suggest that cereal rye used as a cover crop before no-till soybeans can reduce GR horseweed plant density, but that fall herbicide treatments and comprehensive spring residual programs are still important to ensure effective GR horseweed control into the growing season.A survey was conducted annually from 2013 through 2017 in 49 to 52 counties in Ohio soybean fields to assess the frequency, infestation level, and distribution of horseweed, giant ragweed (Ambrosia trifida), common ragweed (Ambrosia artemisiifolia), and three Amaranthus or `pigweed’ species. Horseweed was the most frequently encountered species in all years, followed by giant ragweed, pigweeds, and common ragweed, respectively. Horseweed also had the greatest number of infestations (highest density) each year, followed by giant ragweed, common ragweed, and pigweed species, respectively. Spatial cores of interest, or counties identified as having significant levels of horseweed infestations or lack thereof, relative to surrounding counties, were identified in 2013, 2014, 2015 and 2016, but not 2017. However, the lowest total frequency of horseweed occurred in 2017, which coincided with second highest frequency of infestations among years. There was no distinct distribution or pattern of horseweed movement within the state from year to year, but there did seem to be an increase in counties with one to three infested fields over time compared to the early years of the survey where many counties had one or no infested fields. These results suggest that horseweed persists as a common and troublesome threat to Ohio… Advisors/Committee Members: Loux, Mark (Advisor).

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Lamb, A. (2018). The Current Status and Control of Horseweed (Conyza canadensis) in Ohio Soybean (Glycine max) Production. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1523877602007281

Chicago Manual of Style (16^th Edition):

Lamb, Alyssa. “The Current Status and Control of Horseweed (Conyza canadensis) in Ohio Soybean (Glycine max) Production.” 2018. Masters Thesis, The Ohio State University. Accessed March 02, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1523877602007281.

MLA Handbook (7^th Edition):

Lamb, Alyssa. “The Current Status and Control of Horseweed (Conyza canadensis) in Ohio Soybean (Glycine max) Production.” 2018. Web. 02 Mar 2021.

Vancouver:

Lamb A. The Current Status and Control of Horseweed (Conyza canadensis) in Ohio Soybean (Glycine max) Production. [Internet] [Masters thesis]. The Ohio State University; 2018. [cited 2021 Mar 02]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1523877602007281.

Council of Science Editors:

Lamb A. The Current Status and Control of Horseweed (Conyza canadensis) in Ohio Soybean (Glycine max) Production. [Masters Thesis]. The Ohio State University; 2018. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1523877602007281

Stellenbosch University

23. Brand, Zanell. Studies on embryonic development and hatchability of ostrich eggs.

Degree: Animal Sciences, 2012, Stellenbosch University

URL: http://hdl.handle.net/10019.1/20314

►

Thesis (PhD(Agric)) – Stellenbosch University, 2012.

ENGLISH ABSTRACT: The ostrich industry experiences high rates of embryonic mortalities during artificial incubation of eggs. Studies have been carried… (more)

▼

Thesis (PhD(Agric)) – Stellenbosch University, 2012.

ENGLISH ABSTRACT: The ostrich industry experiences high rates of embryonic mortalities during artificial incubation of eggs. Studies have been carried out to investigate factors influencing hatchability, as well as determining genotypic effects for commercial production. Eggs from the combination of South African Black (SAB) male ostriches crossed with Zimbabwean Blue (ZB) female ostriches had embryonic losses of 45.7%. The embryonic mortality of eggs produced by pure bred SAB or ZB breeding birds subjected to pure breeding was similar at around 33 - 34%, but embryonic mortality was improved in eggs produced by ZB males and SAB female crosses (27%). Female age had a significant effect on the proportion of chicks pipped, as well as on early and late the embryonic mortalities. Chicks from eggs stored for intermediate periods, i.e. 3, 4 and 6 days prior to being set, were more likely to pip than chicks from those eggs set directly after collection without storage. Embryonic mortality was increased in eggs that were set directly (32.0%) or subjected to longer than 6 days of storage (43.5%). Chicks that pipped in the correct position had a higher probability of successfully hatching than those pipping in the incorrect position. Transfer of eggs between setters (i.e. disturbance of eggs) during incubation reduced the number of ostrich chicks pipping in the correct position. Incubated ostrich eggs with intermediate levels of water loss, i.e. between 9.0 and 19% of fresh egg weight, were more likely to pip in the correct position than those with higher or lower levels of water loss. Such eggs were also less likely to sustain early, late or overall embryonic mortalities. To optimise hatching success it is important to understand embryonic development. After 2 days of incubation the blastoderm area in eggs from the SAB x ZB crosses (104.5 mm) was lower (P < 0.05) compared to the pure SAB (141.0 mm), pure ZB (161.7 mm) and ZB x SAB crosses (166.1 mm). For embryos incubated for 7 to 42 days, both embryonic and leg growth during the 42 days of incubation was similar and approximately linear, more or less doubling in size up to 35 days of incubation. The embryo eye size increased more rapidly than beak length and reached full size of approximately 16.2 mm by 28 days of incubation, whereas the beak length continued to increase until the chick hatched at 42 days. Incubation position, vertical or horizontal, did not affect any of the measurements of the developing embryo throughout the 42-day incubation period. Air cell volume at 29 day of incubation for infertile eggs (19.3%) was significantly (P < 0.05) higher when compared to dead-in-shell eggs (14.3%) and eggs that hatched successfully (13.8%). Air cell volume was largely independent of strain (SAB or ZB) and whether chicks were assisted to hatch or not. After 41 days of incubation there was a significantly greater (P < 0.05) air cell volume in eggs that hatched normally compared to dead-in-shell eggs (28.3% vs. 21.7%,…

Advisors/Committee Members: Cloete, Schalk W. P., Malecki, I. A., Brown, C. R., Stellenbosch University. Faculty of AgriSciences. Dept. of Animal Sciences..

Subjects/Keywords: Agriculture

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APA (6^th Edition):

Brand, Z. (2012). Studies on embryonic development and hatchability of ostrich eggs. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/20314

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):

Brand, Zanell. “Studies on embryonic development and hatchability of ostrich eggs.” 2012. Thesis, Stellenbosch University. Accessed March 02, 2021. http://hdl.handle.net/10019.1/20314.

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

MLA Handbook (7^th Edition):

Brand, Zanell. “Studies on embryonic development and hatchability of ostrich eggs.” 2012. Web. 02 Mar 2021.

Vancouver:

Brand Z. Studies on embryonic development and hatchability of ostrich eggs. [Internet] [Thesis]. Stellenbosch University; 2012. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10019.1/20314.

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

Council of Science Editors:

Brand Z. Studies on embryonic development and hatchability of ostrich eggs. [Thesis]. Stellenbosch University; 2012. Available from: http://hdl.handle.net/10019.1/20314

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

University of Helsinki

24. Laurila, Heikki. Spring wheat (Triticum aestivum L.) ideotype responses to elevated CO2 and temperature levels : A cereal yield modeling study using satellite information.

Degree: Department of Agricultural Sciences; MTT Agrifood Research Finland,FI-31600 Jokioinen, Finland, 2013, University of Helsinki

URL: http://hdl.handle.net/10138/38672

► The wheat (Triticum aestivum L.) ideotype concept is defined as the optimal wheat genotype with a maximum potential for grain yield under optimal growing conditions.… (more)

▼ The wheat (Triticum aestivum L.) ideotype concept is defined as the optimal wheat genotype with a maximum potential for grain yield under optimal growing conditions. The ideotype concept has been widely reviewed in agronomy research for a variety of crops. The wheat ideotype with optimum yielding capacity and with adaptation to elevated atmospheric CO2 concentrations should have rapid canopy closure at the tillering stage and a long grain-filling period, with high temperature sum requirements from anthesis to maturity. The CERES-Wheat modeling results using the non-limited Open Top Chamber (OTC) data (1992-1994) indicated, when using the CERES-Wheat potential, non-limiting model, that the simulated grain yield of high-latitude cv. Polkka increased under elevated CO2 conditions (700 ppm) to 142 % and to 161 % for the mid-European cv. Nandu, as compared with the reference level (ypot, 100%). The corresponding observed average 1992-1994 increase in OTC experiments was lower (112 % cv. Polkka). The elevated temperature (+ 3 °C) accelerated phenological development, especially during the generative phase, according to the CERES-Wheat model estimations. The yield of cv. Polkka decreased on average to 80.4 % (59 % cv. Nandu, vs. 84 % OTC observed) due to temperature increase from the simulated reference level (ypot, 100%). When modeling the elevated temperature and CO2 interaction, the increase in grain yield under elevated CO2 was reduced by the elevated temperature, accelerating phenological development, especially during the generative phase, resulting in a shorter grain-filling period. The combined CO2 and temperature effect increased cv. Polkka grain yield to 106 % (107 % for cv. Nandu) under non-limited growing conditions (vs. 102 % OTC observed) as compared with the simulated reference level (ypot,100 %). The modeling results from the CERES-Wheat crop model, ideotype and cultivation value models imply that with new high yielding mid-European ideotypes, the nonpotential baseline yield (yb) would be on average 5150 kg ha-1 (+ 108 %) vs. new highlatitude ideotypes (yb 4770 kg ha-1, 100%) grown under the elevated CO2(700ppm)×temperature(+3ºC) growing conditions projected for the year 2100 FINSKEN climate change scenario for southern Finland, with elevated CO2 (733 ppm) and temperature (+4.4 °C) levels. The Ideotype, Cultivation value, Mixed structural covariance, Path and yield component analysis results emphasized that especially grains/ear, harvest index (HI) and maximum 1000 kernel weight were significant factors defining the highest yield potential for high-latitude and mid-European spring wheat genotypes. In addition, the roles of flag leaf area and dry weight, especially during the generative phase after heading, were important factors defining the final grain yield potential for new highyielding wheat ideotypes. The 1989-2004 averaged cereal yield modeling results using optical and microwave satellite data from southern Finland with Vegetation Indices (VGI) and Composite Multispectral (CMM) models, suggest a…

Subjects/Keywords: agriculture; agriculture

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APA (6^th Edition):

Laurila, H. (2013). Spring wheat (Triticum aestivum L.) ideotype responses to elevated CO2 and temperature levels : A cereal yield modeling study using satellite information. (Doctoral Dissertation). University of Helsinki. Retrieved from http://hdl.handle.net/10138/38672

Chicago Manual of Style (16^th Edition):

Laurila, Heikki. “Spring wheat (Triticum aestivum L.) ideotype responses to elevated CO2 and temperature levels : A cereal yield modeling study using satellite information.” 2013. Doctoral Dissertation, University of Helsinki. Accessed March 02, 2021. http://hdl.handle.net/10138/38672.

MLA Handbook (7^th Edition):

Laurila, Heikki. “Spring wheat (Triticum aestivum L.) ideotype responses to elevated CO2 and temperature levels : A cereal yield modeling study using satellite information.” 2013. Web. 02 Mar 2021.

Vancouver:

Laurila H. Spring wheat (Triticum aestivum L.) ideotype responses to elevated CO2 and temperature levels : A cereal yield modeling study using satellite information. [Internet] [Doctoral dissertation]. University of Helsinki; 2013. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10138/38672.

Council of Science Editors:

Laurila H. Spring wheat (Triticum aestivum L.) ideotype responses to elevated CO2 and temperature levels : A cereal yield modeling study using satellite information. [Doctoral Dissertation]. University of Helsinki; 2013. Available from: http://hdl.handle.net/10138/38672

Stellenbosch University

25. Steyn, Lobke. Supplementation of a high fibre concentrate to Jersey cows on pasture to overcome winter roughage shortages.

Degree: MScAgric, Animal Sciences, 2012, Stellenbosch University

URL: http://hdl.handle.net/10019.1/71880

► ENGLISH ABSTRACT: Kikuyu over-sown with ryegrass is the most widely used pasture system in the Southern Cape of South Africa. During the winter months the… (more)

▼ ENGLISH ABSTRACT: Kikuyu over-sown with ryegrass is the most widely used pasture system in the Southern Cape of South Africa. During the winter months the kikuyu component remains dormant and cows are solely dependent on the ryegrass component of the pasture. Ryegrass has a low growth rate (25 - 30 kg DM ha-1 day-1) during the winter and early spring months (June - September), resulting in roughage shortages. There are various strategies that can be adopted to overcome these shortages. Most commonly, lucerne hay is bought in. The cost (R 1800 - R 2400 ton-1), however, is high and all farms do not have the capacity to store hay in large quantities. Significant wastages occur when feeding lucerne in ring feeders or feed troughs. Silage made of surplus grass, maize or cereal crops can also be fed. Many farms do not have the implements required for ensiling and due to financial pressure, most farms are at full capacity and as such no surplus pasture is available for ensiling. The purpose of this study was to determine whether a high fibre concentrate supplement and restricted pasture intake strategy could be followed to overcome roughage shortages during the winter months. Forty eight lactating Jersey cows were blocked according to 4 % fat corrected milk yield (19.1 ± 2.2 kg day-1 (±s.d.)), days in milk (104 ± 62.7) and lactation number (4.4 ± 1.8). Cows within blocks were then randomly allocated to one of the three treatments. Treatments were defined according to the amount of a high fibre concentrate supplement that was allocated as well as the level of pasture allocated: Treatment 1 - Low concentrate treatment (LC) received 4 kg concentrate cow-1 day-1 and 10 kg DM pasture cow-1 day-1; Treatment 2 - Medium concentrate treatment (MC) received 7 kg concentrate cow-1 day-1 and 7 kg DM pasture cow-1 day-1; Treatment 3 - High concentrate treatment (HC) received 10 kg concentrate cow-1 day-1 and 5 kg DM pasture cow-1 day-1. Eight ruminally cannulated Jersey cows were used in the rumen study portion of the trial. These cows were divided into two groups of four and were allocated to the MC and LC treatments. They were used in a cross-over design, where all cows were subjected to both treatments. The metabolisable energy, crude protein and neutral detergent fibre contents of the high fibre concentrate supplement was 10.9 MJ kg-1, 145 g kg-1 and 231 g kg-1, respectively. Cows of the three treatments grazed separately, allowing for the restriction of pasture intake according to treatments specifications. The average daily milk yield and milk fat content of treatments LC, MC and HC was 16.2a, 17.3ab and 18.1b kg day-1 (P < 0.05) and 4.91a, 4.96a and 4.58b % (P < 0.05), respectively. The average stocking rate for treatment LC, MC and HC was 5.07a, 6.07b and 7.64c cows ha-1 respectively. Thirty seven percent of pasture was saved on the HC treatment strategy compared to the LC treatment. Cows gained body weight during the study at a rate of 0.62a, 0.28b and 0.27b kg day-1 (P < 0.05) for the LC, MC and HC treatments, respectively.… Advisors/Committee Members: Meeske, R., Cruywagen, C. W., Stellenbosch University. Faculty of AgriSciences. Dept. of Animal Sciences..

Subjects/Keywords: Agriculture; Dissertations – Agriculture

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APA (6^th Edition):

Steyn, L. (2012). Supplementation of a high fibre concentrate to Jersey cows on pasture to overcome winter roughage shortages. (Masters Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/71880

Chicago Manual of Style (16^th Edition):

Steyn, Lobke. “Supplementation of a high fibre concentrate to Jersey cows on pasture to overcome winter roughage shortages.” 2012. Masters Thesis, Stellenbosch University. Accessed March 02, 2021. http://hdl.handle.net/10019.1/71880.

MLA Handbook (7^th Edition):

Steyn, Lobke. “Supplementation of a high fibre concentrate to Jersey cows on pasture to overcome winter roughage shortages.” 2012. Web. 02 Mar 2021.

Vancouver:

Steyn L. Supplementation of a high fibre concentrate to Jersey cows on pasture to overcome winter roughage shortages. [Internet] [Masters thesis]. Stellenbosch University; 2012. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10019.1/71880.

Council of Science Editors:

Steyn L. Supplementation of a high fibre concentrate to Jersey cows on pasture to overcome winter roughage shortages. [Masters Thesis]. Stellenbosch University; 2012. Available from: http://hdl.handle.net/10019.1/71880

Stellenbosch University

26. Van Zyl, Albertus J. Assessment of the possible interactions between soil and plant water status in a Vitis vinifera cv. Merlot vineyard.

Degree: MScAgric, Viticulture and Oenology, 2014, Stellenbosch University

URL: http://hdl.handle.net/10019.1/96088

►

ENGLISH ABSTRACT: Irrigation scheduling decisions are based either on the direct measurement of soil water status (SWS) or on physiological measurements like plant water status… (more)

▼

ENGLISH ABSTRACT: Irrigation scheduling decisions are based either on the direct measurement of soil water status (SWS) or on physiological measurements like plant water status (PWS). Soil based measurements are quick and easily automated, but the plant response for a particular quantity of soil moisture varies as a complex function of evaporative demand. A plant-based approach measures the plant stress response directly, but is an integration of environmental effects as well. In contrary to soil-based methods, plant based measurements can indicate when to irrigate, but not the quantity. Pre-dawn leaf water potential (ΨPD) is determined mostly by the soil moisture level, and can serve as a measure of static water stress in plants and an index of bulk soil water availability or even as an estimate of soil water potential at the root surface. Therefore it should be possible to establish a link between SWS and PWS, but it is largely unknown how stable the link in a heterogeneous vineyard would be, and how the grapevine vegetative and reproductive response relates to this link. Plant water status plays a large role in determining vigour and yield of the plant. The levels of PWS are influenced by irrigation, but it was mostly affected by the season and vine location in the vineyard. More negative plant water potentials reduced vigour, but had a less pronounced effect on yield, while also reducing overall wine quality. Vigour variability in the vineyard was largely attributed to soil heterogeneity, which seemed to have a strong effect on SWS. SWS measurements were calibrated according to the observed variability, increasing the accuracy of measurements significantly. Soil water content values were used to establish a link between SWS and PWS. This link was determined over time using nine plots, consisting of rain-fed and irrigated regimes, in variable vigour areas. A non-linear relationship was found between ΨPD and percentage extraction of plant available water for rain-fed plots. When irrigation was applied, no correlation could be found. In this study, for Merlot in the Stellenbosch region, PWS differences affected vigour, and to a lesser extent yield, as well as wine quality. More negative plant water potentials reduced vigour more in high vigour areas than in lower vigour areas, which in turn led to unbalanced vegetative: reproductive ratios. This disturbed vine balance may have had a bigger impact on wine quality than PWS levels. Therefore a well-managed and balanced vine is able to withstand more stress, with less detrimental effects. This study also highlights the danger of limiting the assessment of soil and plant water status conditions to point measurements in vineyards with high levels of vigour variability.

AFRIKAANSE OPSOMMING: Besluite rakende die skedulering van besproeiing word gewoonlik gebaseer op die direkte meting van grondwaterstatus (GWS), of op fisiologiese metings soos byvoorbeeld plantwaterstatus (PWS). Grond gebaseerde metings is relatief vinnig en maklik om te…

Advisors/Committee Members: Strever, Albert E., Stellenbosch University. Faculty of AgriSciences. Dept. of Viticulture and Oenology..

Subjects/Keywords: Agriculture; Dissertations – Agriculture

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APA (6^th Edition):

Van Zyl, A. J. (2014). Assessment of the possible interactions between soil and plant water status in a Vitis vinifera cv. Merlot vineyard. (Masters Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/96088

Chicago Manual of Style (16^th Edition):

Van Zyl, Albertus J. “Assessment of the possible interactions between soil and plant water status in a Vitis vinifera cv. Merlot vineyard.” 2014. Masters Thesis, Stellenbosch University. Accessed March 02, 2021. http://hdl.handle.net/10019.1/96088.

MLA Handbook (7^th Edition):

Van Zyl, Albertus J. “Assessment of the possible interactions between soil and plant water status in a Vitis vinifera cv. Merlot vineyard.” 2014. Web. 02 Mar 2021.

Vancouver:

Van Zyl AJ. Assessment of the possible interactions between soil and plant water status in a Vitis vinifera cv. Merlot vineyard. [Internet] [Masters thesis]. Stellenbosch University; 2014. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10019.1/96088.

Council of Science Editors:

Van Zyl AJ. Assessment of the possible interactions between soil and plant water status in a Vitis vinifera cv. Merlot vineyard. [Masters Thesis]. Stellenbosch University; 2014. Available from: http://hdl.handle.net/10019.1/96088

Stellenbosch University

27. Teuchert, Nicole. Comparison of production parameters, gut histology, organ weights, and portion yields of broilers supplemented with Ateli plus.

Degree: MScAgric, Animal Sciences, 2014, Stellenbosch University

URL: http://hdl.handle.net/10019.1/86448

► ENGLISH ABSTRACT: Antibiotic growth promoters (AGP’s) have been used in feed of production animals to improve their growth performance and disease resistance. However, there has… (more)

▼ ENGLISH ABSTRACT: Antibiotic growth promoters (AGP’s) have been used in feed of production animals to improve their growth performance and disease resistance. However, there has been an increase in the presence of antibiotic residue in animal products, as well as an increase in untreatable illnesses due to antibiotic resistant bacteria. This led to the European Union banning the use of antibiotic growth promoters, in production animals, in 2006. An alternative to AGP’s is therefore needed in animal feed in order to maintain performance. Plant extracts and essential oils have gained much attention, due to their natural antimicrobial, antibacterial, anticoccidial and antioxidant properties. This study tested the efficiency of Ateli plus®, an oregano plant extract based product, as a replacement to AGP’s on production parameters, carcass characteristics and organ and gut health of broilers. This study consisted of five treatments fed to broilers from hatch till 33 days of age, fed in three phases; starter, grower and finisher. The treatment diets consisted of a negative control (no AGP), positive control (AGP), Ateli plus® at 1kg/ton (Ateli plus® min), Ateli plus® at 2kg/ton for week one followed by 1kg/ton for the remainder of the period (Ateli plus® max), and AGP plus Ateli plus® max (AGP plus Ateli plus® max). Results from this study show that there was no difference in performance parameters between treatments. The performance parameters tested included liveability, average daily gain (ADG), average weekly feed intake, average cumulative feed intake, average weekly live weight, average cumulative weight gains, feed conversion ratio (FCR), cumulative FCR and the European production efficiency factor (EPEF). Broiler breast and thigh muscle pH and colour (L*, a* and b*) reading values were measured, showing a trend for improved L* colour reading value and ultimate pH, in broilers supplemented with Ateli plus®. This leads to an increase in water binding capacity and tenderness, therefore resulting in an improvement in meat quality. No differences were shown for dressing percentage and portion percentages relative to carcass weight. No significant differences were seen for tibia bone Ca and P content, or tibia bone fat, moisture or ash percentages. However a significant decrease in tibia bone strength was found in all broilers supplemented with Ateli plus® diets and the negative control diet, compared to AGP supplemented broilers. Gut morphology showed no consistent effect of treatment on villi height or crypt depth of the duodenum, jejunum and ileum. No significant differences between treatments were found for organ pH or organ weights, except the gizzard, which was heavier for Ateli plus® max supplemented broilers. Ateli plus® shows promise on improving meat quality characteristics of broilers, however the significant decrease in tibia bone strength in Ateli plus® supplemented broilers is a major concern and needs to be researched further. Ateli plus® acts as a good AGP replacement, as… Advisors/Committee Members: Pieterse, E., Hoffman, L. C., Stellenbosch University. Faculty of AgriSciences. Dept. of Animal Sciences..

Subjects/Keywords: Agriculture; Dissertations – Agriculture

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

APA (6^th Edition):

Teuchert, N. (2014). Comparison of production parameters, gut histology, organ weights, and portion yields of broilers supplemented with Ateli plus. (Masters Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/86448

Chicago Manual of Style (16^th Edition):

Teuchert, Nicole. “Comparison of production parameters, gut histology, organ weights, and portion yields of broilers supplemented with Ateli plus.” 2014. Masters Thesis, Stellenbosch University. Accessed March 02, 2021. http://hdl.handle.net/10019.1/86448.

MLA Handbook (7^th Edition):

Teuchert, Nicole. “Comparison of production parameters, gut histology, organ weights, and portion yields of broilers supplemented with Ateli plus.” 2014. Web. 02 Mar 2021.

Vancouver:

Teuchert N. Comparison of production parameters, gut histology, organ weights, and portion yields of broilers supplemented with Ateli plus. [Internet] [Masters thesis]. Stellenbosch University; 2014. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10019.1/86448.

Council of Science Editors:

Teuchert N. Comparison of production parameters, gut histology, organ weights, and portion yields of broilers supplemented with Ateli plus. [Masters Thesis]. Stellenbosch University; 2014. Available from: http://hdl.handle.net/10019.1/86448

Stellenbosch University

28. Mashimbye, Zama Eric. Remote sensing of salt-affected soils.

Degree: PhD, Soil Science, 2013, Stellenbosch University

URL: http://hdl.handle.net/10019.1/79809

► ENGLISH ABSTRACT: Concrete evidence of dryland salinity was observed in the Berg River catchment in the Western Cape Province of South Africa. Soil salinization is… (more)

▼ ENGLISH ABSTRACT: Concrete evidence of dryland salinity was observed in the Berg River catchment in the Western Cape Province of South Africa. Soil salinization is a global land degradation hazard that negatively affects the productivity of soils. Timely and accurate detection of soil salinity is crucial for soil salinity monitoring and mitigation. It would be restrictive in terms of costs to use traditional wet chemistry methods to detect and monitor soil salinity in the entire Berg River catchment. The goal of this study was to investigate less tedious, accurate and cost effective techniques for better monitoring. Firstly, hyperspectral remote sensing (HRS) techniques that can best predict electrical conductivity (EC) in the soil using individual bands, a unique normalized difference soil salinity index (NDSI), partial least squares regression (PLSR) and bagging PLSR were investigated. Spectral reflectance of dry soil samples was measured using an analytical spectral device FieldSpec spectrometer in a darkroom. Soil salinity predictive models were computed using a training dataset (n = 63). An independent validation dataset (n = 32) was used to validate the models. Also, field-based regression predictive models for EC, pH, soluble Ca, Mg, Na, Cl and SO4 were developed using soil samples (n = 23) collected in the Sandspruit catchment. These soil samples were not ground or sieved and the spectra were measured using the sun as a source of energy to emulate field conditions. Secondly, the value of NIR spectroscopy for the prediction of EC, pH, soluble Ca, Mg, Na, Cl, and SO4 was evaluated using 49 soil samples. Spectral reflectance of dry soil samples was measured using the Bruker multipurpose analyser spectrometer. “Leave one out” cross validation (LOOCV) was used to calibrate PLSR predictive models for EC, pH, soluble Ca, Mg, Na, Cl, and SO4. The models were validated using R2, root mean square error of cross validation (RMSECV), ratio of prediction to deviation (RPD) and the ratio of prediction to interquartile distance (RPIQ). Thirdly, owing to the suitability of land components to map soil properties, the value of digital elevation models (DEMs) to delineate accurate land components was investigated. Land components extracted from the second version of the 30-m advanced spaceborne thermal emission and reflection radiometer global DEM (ASTER GDEM2), the 90-m shuttle radar topography mission DEM (SRTM DEM), two versions of the 5-m Stellenbosch University DEMs (SUDEM L1 and L2) and a 5-m DEM (GEOEYE DEM) derived from GeoEye stereo-images were compared. Land components were delineated using the slope gradient and aspect derivatives of each DEM. The land components were visually inspected and quantitatively analysed using the slope gradient standard deviation measure and the mean slope gradient local variance ratio for accuracy. Fourthly, the spatial accuracy of hydrological parameters (streamlines and catchment boundaries) delineated from the 5-m resolution SUDEM (L1 and L2), the 30-m… Advisors/Committee Members: De Clercq, Willem Petrus, Van Niekerk, Adriaan, Stellenbosch University. Faculty of AgriSciences. Dept. of Soil Science..

Subjects/Keywords: Agriculture; Dissertations – Agriculture

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

APA (6^th Edition):

Mashimbye, Z. E. (2013). Remote sensing of salt-affected soils. (Doctoral Dissertation). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/79809

Chicago Manual of Style (16^th Edition):

Mashimbye, Zama Eric. “Remote sensing of salt-affected soils.” 2013. Doctoral Dissertation, Stellenbosch University. Accessed March 02, 2021. http://hdl.handle.net/10019.1/79809.

MLA Handbook (7^th Edition):

Mashimbye, Zama Eric. “Remote sensing of salt-affected soils.” 2013. Web. 02 Mar 2021.

Vancouver:

Mashimbye ZE. Remote sensing of salt-affected soils. [Internet] [Doctoral dissertation]. Stellenbosch University; 2013. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10019.1/79809.

Council of Science Editors:

Mashimbye ZE. Remote sensing of salt-affected soils. [Doctoral Dissertation]. Stellenbosch University; 2013. Available from: http://hdl.handle.net/10019.1/79809

29. Serra Stepke, Ignacio M. Grapevine (Vitis vinifera L., cv. Pinotage) responses to water deficit modulated by rootstocks.

Degree: Viticulture and Oenology, 2014, Stellenbosch University

URL: http://hdl.handle.net/10019.1/96133

►

Thesis (PhD(Agric)) – Stellenbosch University, 2014.

ENGLISH ABSTRACT: Water scarcity is a key limiting factor for viticulture in dry regions. Traditionally drought sensitive varieties have the… (more)

▼

Thesis (PhD(Agric)) – Stellenbosch University, 2014.

ENGLISH ABSTRACT: Water scarcity is a key limiting factor for viticulture in dry regions. Traditionally drought sensitive varieties have the potential to grow in dry areas, however in most situations, through the use of rootstocks. Drought-tolerant rootstocks are expected to improve grapevine response to water deficit by improving the water uptake and transport and by reducing the water loss in leaves by root-to-shoot signalling. The mechanisms of rootstocks’ tolerance to drought are not yet fully understood. The main aim of this study was to improve the understanding of the rootstock/scion-cultivar interaction in the regulation of grapevine water use and leaf stomatal behaviour. Irrigated field vines without any water constraint were compared to rain-fed grapevines subjected to moderate water constraint. To better manage vine water status, reduce variability, and compare more rootstocks, greenhouse trials were also conducted where plants were well watered or subjected to severe water constraints. Pinotage grapevines (Vitis vinifera L.) grafted onto 110 Richter, 140 Ruggeri and 1103 Paulsen rootstocks were used for field experiments whereas Pinotage grapevines grafted onto 99 Richter, 110 Richter, 140 Ruggeri, 1103 Paulsen and Ramsey were used for greenhouse experiments. Our study suggested the influence of rootstocks on scion-cultivar water status and leaf stomatal size and density and gas exchange of the scion, implying an influence on water uptake and transport and a tight regulation of the stomatal conductance. Our data supported the hypothesis that the influence of rootstock in response to drought seemed to be higher under increasing water deficit up to a point where the plant water status is the main driver of the stomatal conductance and therefore photosynthesis regulation, considering the plant water status thresholds. In addition, the results suggested that stomatal development is affected by light, drought and possibly by rootstocks. Nevertheless, it is still not clear how the rootstock affects stomatal development and the link with scion-cultivar water use. It seems that the transpiration rate of leaves is more related to stomatal size than density. Thus one possible mechanism of Pinotage leaf adaptation to water constraints was structural during leaf growth, with a reduction in pore size to reduce plant water loss. The results showed that the rootstock is regulating the cultivar's stomatal size (anatomical changes during leaf growth) and functioning (stomatal regulation) through a complex signalling process. The effect of light on stomatal development is interesting in the context of canopy microclimate and canopy manipulation (choice of the vine architecture vs canopy size, in the context of climate change versus the possible increase in drought and water scarcity). The use of rootstocks is a long term investment which aims to provide resistance to soil pests and pathogens and to confer to the scion-cultivar drought and…

Advisors/Committee Members: Deloire, Alain, Myburgh, Philip, Stellenbosch University. Faculty of AgriSciences. Dept. of Viticulture and Oenology..

Subjects/Keywords: Agriculture; Dissertations – Agriculture

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APA (6^th Edition):

Serra Stepke, I. M. (2014). Grapevine (Vitis vinifera L., cv. Pinotage) responses to water deficit modulated by rootstocks. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/96133

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):

Serra Stepke, Ignacio M. “Grapevine (Vitis vinifera L., cv. Pinotage) responses to water deficit modulated by rootstocks.” 2014. Thesis, Stellenbosch University. Accessed March 02, 2021. http://hdl.handle.net/10019.1/96133.

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

MLA Handbook (7^th Edition):

Serra Stepke, Ignacio M. “Grapevine (Vitis vinifera L., cv. Pinotage) responses to water deficit modulated by rootstocks.” 2014. Web. 02 Mar 2021.

Vancouver:

Serra Stepke IM. Grapevine (Vitis vinifera L., cv. Pinotage) responses to water deficit modulated by rootstocks. [Internet] [Thesis]. Stellenbosch University; 2014. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10019.1/96133.

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

Council of Science Editors:

Serra Stepke IM. Grapevine (Vitis vinifera L., cv. Pinotage) responses to water deficit modulated by rootstocks. [Thesis]. Stellenbosch University; 2014. Available from: http://hdl.handle.net/10019.1/96133

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

Stellenbosch University

30. Lorenzen, Jan Frederik George. The effect of lairage time and transport density on live weight losses and meat quality in slaughter ostriches.

Degree: MScAgric, Animal Sciences, 2012, Stellenbosch University

URL: http://hdl.handle.net/10019.1/71714

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ENGLISH ABSTRACT: Although transport and lairage of ostriches are accepted causes of production losses, these losses have not yet been quantified. Transport and lairage regulations… (more)

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ENGLISH ABSTRACT: Although transport and lairage of ostriches are accepted causes of production losses, these losses have not yet been quantified. Transport and lairage regulations focus on the wellbeing of the birds and, by default reduce some losses. This thesis investigated weight losses and meat quality of ostriches as a result of transport density, lairage duration and lairage feed availability (ad libitum). All birds were reared on the same farm and loaded and transported together. They were randomly divided into their respective groups on loading for the transport trial, and on offloading for the lairage trial. Bird grouping was according to density for the transport trial (4 groups, H1, H2: 0.56m2/bird and L1, L2: 0.96m2/bird) and according to time spent in lairage and feed availability for the lairage trial (n=30 birds/group; L0hr and L24hr; n=15 birds/group L48hr and L48hr ad libitum feed). Behavioural observations of the ostriches showed a tendency of the ostriches to lean against objects and to orientate towards forces exerted on it to help keep its balance. Reactions to sound fluctuations were noted, with birds reacting towards changes in sound volume during transport and lairage. Timepoint numbers were allocated for each time the birds were weighed during the trial. Time points 1, 2, 3, 4 and 5 were allocated to loading, arrival, 19 hr in lairage, 31 hr in lairage and 39 hr in lairage respectively for Trial 2. Results showed no differences (P > 0.05) in live weights or meat quality parameters between Groups H1, H2, L1 and L2 during transport. Differences (P < 0.05) were found in cumulative weight losses between L0hr and the rest of the groups for time point 1. Differences between L48hr and L48hr ad libitum were found for time point 4 for cumulative weight loss. L48hr also differed significantly between the other lairage duration groups for dressing percentages as a function of loading weight. Ad libitum feed availability had a significant effect on live body weight changes but not the meat quality parameters for the groups held for 48hr in lairage. The number of birds having bruises (≈50% per group) was similar between groups and lairage had no influence on bruising. Results seem to indicate that the evaluated transport densities had no effect on the weight loss or meat quality of ostriches. However, the results indicate that the lairage period should be studied further with specific reference to weight losses during lairage. Meat quality was unaffected by the lairage parameters reported in this thesis.

AFRIKAASE OPSOMMING: Hoewel vervoer en voorslag hou (“lairage”) aanvaar word as die oorsake van produksieverliese, is hierdie aspekte nog nie gekwantifiseer nie. Regulasies in terme van vervoer en voorslag hou fokus op die welstand van die voëls en gevolglik verminder sommige verliese met hierdie faktore. Konflik tussen boere en sekondêre produsente (abattoirs en verwerkers) oor die kostes verbonde aan hierdie gewigsverliese, is in wese ‘n oorsaak van oorbruggingsfases (vervoer). Daarom is die…

Advisors/Committee Members: Hoffman, L. C., Brand, T. S., Stellenbosch University. Faculty of AgriSciences. Dept. of Animal Sciences..

Subjects/Keywords: Agriculture; Dissertations – Agriculture

Record Details Similar Records Cite « Share

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

APA (6^th Edition):

Lorenzen, J. F. G. (2012). The effect of lairage time and transport density on live weight losses and meat quality in slaughter ostriches. (Masters Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/71714

Chicago Manual of Style (16^th Edition):

Lorenzen, Jan Frederik George. “The effect of lairage time and transport density on live weight losses and meat quality in slaughter ostriches.” 2012. Masters Thesis, Stellenbosch University. Accessed March 02, 2021. http://hdl.handle.net/10019.1/71714.

MLA Handbook (7^th Edition):

Lorenzen, Jan Frederik George. “The effect of lairage time and transport density on live weight losses and meat quality in slaughter ostriches.” 2012. Web. 02 Mar 2021.

Vancouver:

Lorenzen JFG. The effect of lairage time and transport density on live weight losses and meat quality in slaughter ostriches. [Internet] [Masters thesis]. Stellenbosch University; 2012. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10019.1/71714.

Council of Science Editors:

Lorenzen JFG. The effect of lairage time and transport density on live weight losses and meat quality in slaughter ostriches. [Masters Thesis]. Stellenbosch University; 2012. Available from: http://hdl.handle.net/10019.1/71714

Open Access Theses and Dissertations