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Dissertations / Theses on the topic 'Crop production management'

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Published: 5 June 2025

Last updated: 2 August 2025

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1

Mutiso, Samuel Kituku. "Water resources and crop production in Machakos District, Kenya." Thesis, University of Reading, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262188.

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2

Norton, Elbert Randall. "Nutrient and crop management studies in irrigated cotton production systems." Diss., The University of Arizona, 2000. http://hdl.handle.net/10150/279773.

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Increased efficiency in agricultural production is becoming increasingly important in the present economic climate. The three studies presented in this dissertation have been developed to help producers achieve a greater efficiency with respect to crop production. The first is the development of the cotton monitoring system (CMS). This software was developed as an end product to over ten years of research into cotton crop monitoring. It allows for the entry of crop growth and development data, along with other crop inputs. All growth indices are plotted against long-term baselines to indicate

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3

Nyamudeza, Phibion. "Water and fertility management for crop production in semi-arid Zimbabwe." Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243687.

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4

Silvertooth, J. C. "Cultural and Management Practices for Pima Cotton Production." College of Agriculture, University of Arizona (Tucson, AZ), 1994. http://hdl.handle.net/10150/209590.

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The good use of cultural or agronomic practices is fundamental to the production of high yields and quality of American Pima cotton. In order for Pima farmers to maintain viable production operations, a continual review and improvement upon the existing set of cultural practices are in order. Basic aspects of crop production such as planting date management, soil fertility and plant nutrition, plant growth regulator use, crop termination, and defoliation are reviewed in this paper in relation to American Pima cotton production. Specific attention is also given to potassium (K) fertility manage

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5

Battaglia, Martin. "Crop residue management effects on crop production, greenhouse gases emissions, and soil quality in the Mid-Atlantic USA." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/86483.

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Cellulosic biomass-to-bioenergy systems can provide environmental and economic benefits to modern societies, reducing the dependence on fossil-fuels and greenhouse gas emissions while simultaneously improving rural economies. Corn (Zea mays L.) stover and wheat straw (Triticum aestivum L.) residues have particular promise given these crops are widely grown and their cellulosic fractions present a captured resource as a co-product of grain production. Annual systems also offer the ability to change crops rapidly in response to changing market demands. However, concerns exist about residue remov

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6

Knowles, Tim C., and Roc Cramer. "Narrow Row Cotton Production in Vicksberg." College of Agriculture, University of Arizona (Tucson, AZ), 1999. http://hdl.handle.net/10150/197038.

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Deltapine 458B/RR, Deltapine 5415RR, Deltapine 20B, and Deltapine 20 cotton varieties were planted on June 5 into narrow 15 inch wide rows. Populations ranged from 80,000 to 100,000 plants per acre. Seed cotton was stripper harvested on December 17. Although lint yields were somewhat low (1- 2 bale/acre) for this late planted cotton, we learned several important practices for effective narrow row cotton production systems, based on our first years experience in western Arizona.

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7

Fuss, Alison Margot. "The floral biology of banksias in relation to crop production and management." Title page, contents and summary only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09phf994.pdf.

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8

Dittmar, Stefan H., Peter C. Ellsworth, Philip MacD Hartman, et al. "1998 Demonstration Project of Arizona Irrigated Cotton Production." College of Agriculture, University of Arizona (Tucson, AZ), 1999. http://hdl.handle.net/10150/197070.

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The Demonstration project was conducted on the Demonstration Farm at the Maricopa Agricultural Center. In this project all current guidelines and recommendations disseminated by the University of Arizona were integrated in a systems approach. The management decisions were made by the Extension Specialists in agronomy, entomology, irrigation management, weed sciences, and plant pathology following the University recommendations. On a 50.5 acre field 80% Bt and 20% non-Bt cotton was planted dry and watered up. Due to the cold spring and sand-blasting, only a stand of 30,900 plants/A could be est

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9

Beam, Shawn Christopher. "Evaluation of integrated weed management techniques and their nuances in Virginia crop production." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/95248.

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Herbicide resistant weeds are driving implementation of integrated weed management (IWM). A new tactic to manage weeds is harvest weed seed control (HWSC), which targets weed seeds retained on the plant at crop harvest and either destroys, removes, or concentrates them. Research is limited on the effectiveness of HWSC in US cropping systems. For HWSC to be effective it is important to know when and how many seed are shed from a weed species in relation to crop harvest. Research was conducted to quantify when weed seed are shattered from 6 economically important weed species, four broadleaf

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10

Sande, Bueno Dickens. "Pollarding and root pruning as management options for tree-crop competition and firewood production." Thesis, Stellenbosch : University of Stellenbosch, 2003. http://hdl.handle.net/10019.1/2355.

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Thesis (MScFor) (Forest and Wood Science)--University of Stellenbosch, 2003.<br>Planting of upperstorey trees along boundaries has been introduced in KabaleUganda with good reception from local farmers. Trees have been planted along agricultural fields, but both Alnus acuminata and Grew/lea robusta out-compete food crops. Managing competition between trees and crops for water, light, and nutrients to the benefit of farmers is a determinant of successful agroforestry. The scarcity and fragmentation of farmland coupled with the hilly nature of Kabale, highlights the need to address the que

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Nuti, Russell C. "Improving Cotton Production Margins through Management Decisions and Use of New and Standard commercial Products to Improve Quality and Profits." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-09092004-101557/.

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Cotton (Gossypium hirsutum L.) is a perennial plant managed as an annual crop to optimize yield and fiber quality while managing inputs to maximize profit. Transgenic improvements have simplified cotton production. Resistance to the non-selective herbicide glyphosate and in-plant production of Bacillus thuringiensis (Bt) endotoxin are two such advances. Cultural practices including use of mepiquat chloride (MC), and optimizing planting date contribute to crop uniformity and decrease risk involved with environmental stresses. Comparisons between conventional and transgenic weed and insect manag

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12

Waine, Toby William. "Non-invasive soil property measurement for precision farming." Thesis, Cranfield University, 1999. http://dspace.lib.cranfield.ac.uk/handle/1826/11322.

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This work investigates the application of new sensors to enable agronomists and farm managers to make decisions for variable treatment strategies at key crop growth stages. This is needed to improve the efficiency of crop production in the context of precision farming. Two non-invasive sensors were selected for investigation. These were: 1) The MGD-1 ion mobility gas detector made by Environics OY, Finland. 2) The EM38 electromagnetic induction (EMI) sensor made by Geonics Inc., Canada. The gas detector was used to determine residual nitrogen and to measure carbon dioxide gas as a surrogate in

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13

Husman, Stephen H., William B. McCloskey, Patrick Clay, et al. "Evaluation of Twin-Line Cotton Production in Arizona - 2002." College of Agriculture, University of Arizona (Tucson, AZ), 2003. http://hdl.handle.net/10150/197722.

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Twin-line (two seed lines 7.25 in apart per bed) and conventional single seed line per bed cotton production systems were compared at 16 sites across Arizona and Blythe, Ca. in 2002. The twin-line system produced more lint than the conventional single-line system at 4 of 16 locations; the yields of the twinline and single-line systems were 1273 and 1186 lb/acre, 1572 and 1461 lb/acre, 1478 and 1290 lb/acre, and 1309 and 1210 lb/acre, respectively, at the Grasty, Ramona, Rovey, and Wells sites, respectively. There were no significant differences in yield or fiber micronaire in 7 of the 16 exper

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Husman, S., P. Clay, E. Taylor, and K. White. "Twin Line Cotton Production in a Conservation Tillage System." College of Agriculture, University of Arizona (Tucson, AZ), 2005. http://hdl.handle.net/10150/198170.

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Two experiments were conducted in 2004 evaluating twin line cotton production using a conservation tillage system approach. DPL 451 BR Upland cotton was planted into oat hay stubble on April 30 and May 5, 2004 at commercial cooperator sites at Tonopah and Tolleson AZ, respectively. The two primary experimental objectives were to determine whether cotton planted into previous crop residue initiated fruiting on the mainstem once the cotton seedling grew above the crop stubble and whether there were differences in lint yield between the single and twin line system. Previous twin line cotton produ

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15

Morris, Cooper H. Jr. "The value, degree, and consistency of Kansas crop farms’ relative characteristics, pratices, and management performances." Thesis, Kansas State University, 2014. http://hdl.handle.net/2097/17631.

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Master of Science<br>Department of Agricultural Economics<br>Kevin Dhuyvetter<br>This research analyzes how crop farms can achieve a higher net income per acre than other operations by farming fundamentally differently than others. There are many factors that are important to the long-term viability of today’s crop operations, one of which is how farms profitability compares with other operations. This determines farms’ ability to compete for land, outlast other operations through periods of unprofitability, and produce crops at long run equilibrium prices. These factors are relevant in t

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16

Seo, Sangtaek. "Effects of federal risk management programs on investment, production, and contract design under uncertainty." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3117.

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Agricultural producers face uncertain agricultural production and market conditions. Much of the uncertainty faced by agricultural producers cannot be controlled by the producer, but can be managed. Several risk management programs are available in the U.S. to help manage uncertainties in agricultural production, marketing, and finance. This study focuses on the farm level economic implications of the federal risk management programs. In particular, the effects of the federal risk management programs on investment, production, and contract design are investigated. The dissertation is comprised

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17

Cogdill, Todd Joseph. "Investigation of management strategies for the production of sweet sorghum as a bioenergy crop and preservation of crop residue by the ensiling process." [Ames, Iowa : Iowa State University], 2008.

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18

Heineman, Arne M. "Species selection for alley cropping in Western Kenya : system management, nutrient use efficiency and tree-crop compatibility (1988-1995)." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318545.

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19

Nelson, J. M., and G. Hart. "Effect of Plant Nitrogen Status on Effectiveness of Defoliants for Short Season Cotton Production." College of Agriculture, University of Arizona (Tucson, AZ), 1991. http://hdl.handle.net/10150/208323.

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A field study was conducted at the Maricopa Agricultural Center to determine the influence of nitrogen fertility level on the effectiveness of defoliants for short-season cotton production. Increasing the nitrogen fertility level from 30 to 130 lbs N/A decreased lint yields from 3.2 to 26 bales /A. High residual soil N favored the use of a low N fertility rate. Defoliation treatments were most effective at the 30 lbs. N/A fertility level. Increasing the application rate of Dropp from 0.2 to 0.4 lbs. a.i./A increased the percent defoliation. There was a significant linear decrease in the effect

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20

Burdack, Doreen. "Water management policies and their impact on irrigated crop production in the Murray-Darling Basin, Australia." Phd thesis, Universität Potsdam, 2014. http://opus.kobv.de/ubp/volltexte/2014/7224/.

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The economic impact analysis contained in this book shows how irrigation farming is particularly susceptible when applying certain water management policies in the Australian Murray-Darling Basin, one of the world largest river basins and Australia’s most fertile region. By comparing different pricing and non-pricing water management policies with the help of the Water Integrated Market Model, it is found that the impact of water demand reducing policies is most severe on crops that need to be intensively irrigated and are at the same time less water productive. A combination of increasingly f

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Norton, E. R., L. J. Clark, and S. H. HUsman. "2002 Evaluation of a Twin-Line Cotton Production System in Graham County." College of Agriculture, University of Arizona (Tucson, AZ), 2003. http://hdl.handle.net/10150/197729.

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A series of studies were conducted around the southeastern region of the state during the 2002 cotton growing season to evaluate the effects of a twin-line (TL) planting configuration on fiber quality and lint yield. Two of the three studies were conducted on grower cooperator fields with large block comparisons or demonstrations of TL versus single-line (SL) configurations. Fiber quality was essentially the same for both demonstration locations. Yield differences were observed in both locations with the Graham County location experiencing a 130 lb lint yield decrease in the TL plots. The Coch

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22

Nelson, J. M., R. E. Briggs, and G. Hart. "Effect of Plant Nitrogen Status on Effectiveness of Pix and Defoliants for Short-Season Cotton Production." College of Agriculture, University of Arizona (Tucson, AZ), 1990. http://hdl.handle.net/10150/208258.

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A field study was conducted at the Maricopa Agricultural Center to determine the effect of nitrogen fertility level on the effectiveness of PIX and defoliants for short- season - cotton production. Increasing the nitrogen fertility level from 90 lbs N/A to 240 lbs N/A increased lint yields from 2.23 to 3.14 bales/A, respectively, in a 157-day growing season. FIX treatments did not promote earliness, and resulted in yield reductions. Increasing the application rates of Dropp from 0.1 to 0.2 lbs a.i./A and Def-6 from 0.75 to 1.13 lbs a.i./A resulted in increases in leaf drop. There was a signifi

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Nelson, J. M., R. E. Briggs, and G. Hart. "Effect of Irrigation Termination Date on Defolation and Yield of Upland Cotton for Short-Season Production." College of Agriculture, University of Arizona (Tucson, AZ), 1990. http://hdl.handle.net/10150/208289.

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A field study was conducted at the Maricopa Agricultural Center to determine the influence of plant water stress on the effectiveness of defoliants and yield of short season cotton. Irrigation termination dates of 11, 18 and 24 August were used to achieve different levels of water stress at the time defoliants were applied (1 September). Irrigation termination dates had little effect on the response of cotton to defoliants. Def-6 at the lowest rate tested, 0.75 lbs a.i./A, was less effective in defoliating cotton with a 24 August irrigation termination date than cotton terminated earlier. Drop

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Nelson, J. M., P. G. Bartels, and G. Hart. "Effect of Plant Water Status on Defoliation and Yield of Upland Cotton for Short-Season Production." College of Agriculture, University of Arizona (Tucson, AZ), 1992. http://hdl.handle.net/10150/208667.

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A field study was conducted at the Maricopa Agricultural Center to determine the influence of plant water status at the time of defoliation on the effectiveness of defoliants and yield of short-season cotton. Irrigation termination dates of 14 and 26 August and 10 September were used to achieve different levels of plant water stress at the time defoliants were applied (19 September). Irrigation termination dates had no effect on seedcotton yield for cotton defoliated in September. As the period between the termination irrigation and the date of chemical defoliation was increased the effectiven

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25

Smith, Matthew K. "Trend yields and the crop insurance program." Thesis, Kansas State University, 2012. http://hdl.handle.net/2097/13748.

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Master of Agribusiness<br>Department of Agricultural Economics<br>Allen M. Featherstone<br>Multiple Peril Crop Insurance (MPCI) is a federally subsidized crop insurance program designed to mitigate risk for farmers across the United States. Many changes in technology and weather have increased yields in recent years. This has caused some to argue for the crop insurance program to consider yield trends when setting yields for the producer. This thesis evaluates alternative Actual Production History (APH) methods for corn to determine differences in the methods and the resulting APH. The ke

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26

Jacobs, Timothy. "Effects of Sudangrass Cover Crop and Soil Solarization on Weed and Pathogen Management in Organic Strawberry Production." DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/2069.

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Field and lab experiments were conducted to determine the efficacy of sudangrass (Sorghum X drumondii (Nees ex Steud.) Millsp. & Chase) cover crop management techniques and soil solarization on important agricultural weeds and pathogens in organic strawberry production in Central California. Lab experiments assessed the time needed to kill weed seeds at temperatures typically achieved during soil solarization (40°C, 45°C, 50°C, 55°C, and 60°C) in California. Seeds tested included little mallow, redstem filaree, bristly oxtongue, annual sowthistle, common purslane, nettleleaf goosefoot, and red

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27

Jordan, Daniel L. "IMPACT OF HIGH-INPUT PRODUCTION PRACTICES ON SOYBEAN YIELD." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_theses/36.

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High-input management practices are often heavily marketed to producers to increase soybean [Glycine max (L) Merr.] yield in already high-yielding environments. Field research was conducted in three locations within 6 states (Arkansas, Iowa, Kentucky, Louisiana, Michigan, and Minnesota) in 2009 to determine the effect of seed treatment, inoculant, foliar fungicide, additional soil fertility beyond state recommendations, foliar fertilizer, increased population over state recommendations, and narrow row spacing on yield. The high-input system (combination of the management practices) yielded hig

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Titolo, Donato. "USING AN ACTIVE OPTICAL SENSOR TO IMPROVE NITROGEN MANAGEMENT IN CORN PRODUCTION." UKnowledge, 2012. http://uknowledge.uky.edu/pss_etds/11.

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Corn nitrogen (N) applications are still done on a field basis in Kentucky, according to previous crop, soil tillage management and soil drainage. Soil tests, as well as plant analysis for N, are not very useful in making N fertilizer rate recommendations for corn. Recommended rates assume that only 1/3 to 2/3 of applied N is recovered, variability largely due to the strong affect of weather on the release of soil N and fertilizer N fate. Many attempts have been made to apply N in a more precise and efficient way. Two experiments were conducted at Spindeltop, the University of Kentucky’s exper

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Creamer, Nancy Gail. "An evaluation of cover crop-processing tomato (lycopersicon esculentum l.) production systems, with an emphasis on weed management /." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487859313344512.

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McHenry, Bailey Marie. "Balanced nutrition and crop production practices for the study of grain sorghum nutrient partitioning and closing yield gaps." Thesis, Kansas State University, 2016. http://hdl.handle.net/2097/32725.

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Master of Science<br>Agronomy<br>Ignacio Ciampitti<br>P. V. Vara Prasad<br>Mid-west grain sorghum (Sorghum bicolor (L.) Moench) producers are currently obtaining much lower than attainable yields across varying environments, therefore, closing yield gaps will be important. Yield gaps are the difference between maximum economic attainable yield and current on-farm yields. Maximum economic yield can be achieved through the optimization of utilizing the best genotypes and management practices for the specific site-environment (soil-weather) combination. This research project examines several mana

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Amisi, Karen Janila. "Strategies for managing weeds in a wheat, red clover, vegetable crop rotation transitioning to organic production." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1104246323.

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Calderwood, Lily. "Top-down and bottom-up tools for integrated pest management in Northeastern hop production." ScholarWorks @ UVM, 2015. http://scholarworks.uvm.edu/graddis/328.

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The demand for locally sourced hops from Northeastern microbreweries began the recent resurgence in local hop production. The farming community has increased acreage and improved the quality of hops grown and processed in the Northeast region over the past five years. There was a sharp increase in the number of Northeast hop producers from six in 2009 to over 175 in 2014. Hop growers in the Northeast are new to the crop and have limited experience with pest identification and management. This dissertation encompasses three research projects that were conducted over the 2012-2014 growing season

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Kenney, Ian T. "Regional assessment of short-term impacts of corn stover removal for bioenergy on soil quality and crop production." Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/13186.

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Master of Science<br>Department of Agronomy<br>Humberto Blanco<br>DeAnn Presley<br>The U.S. agricultural sector is in a prime position to provide crop residues such as corn (Zea mays L.) stover as feedstock for large-scale bioenergy production. While producing renewable energy from biomass resources is a worthy initiative, excessive removal of corn stover from agricultural fields has the potential to increase soil erosion, degrade soil properties, and reduce corn yields. A need exists to objectively assess stover removal impacts on agriculture and the environment on regional scales. This proje

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Cox, Graeme J. "A yield mapping system for sugar cane chopper harvesters." University of Southern Queensland, Faculty of Engineering and Surveying, 2002. http://eprints.usq.edu.au/archive/00004617/.

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[Abstract]: Yield maps provide essential information for the spatial analysis and evaluation of crop production management at a within field level. Technology has been developed to conduct yield mapping in various crops including grain, potatoes and forage, but as yet no technology exists for yield mapping sugar cane. The chopper harvester is the most common form ofmechanical harvester for sugar cane. Therefore, the goal of this research is to develop a yield mapping system for the chopper type sugar cane harvester.After a review, it is proposed that a suitable accuracy goal for the sugar cane

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Ikazaki, Kenta. "Development of a Land Management Practice for Wind Erosion Control and Improvement of Crop Production in the Sahel, West Africa." Kyoto University, 2010. http://hdl.handle.net/2433/120464.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第15421号<br>農博第1806号<br>新制||農||979(附属図書館)<br>学位論文||H22||N4520(農学部図書室)<br>27899<br>京都大学大学院農学研究科地域環境科学専攻<br>(主査)教授舟川晋也, 教授縄田栄治, 教授間藤徹<br>学位規則第4条第1項該当

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Purwanto, Ris Hadi. "Teak (Tectona grandis Linn.f.) and food crop production under agroforestry management in moist deciduous forests of eastern Java in Indonesia." Kyoto University, 2005. http://hdl.handle.net/2433/145043.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第11643号<br>農博第1499号<br>新制||農||909(附属図書館)<br>学位論文||H17||N4036(農学部図書室)<br>23286<br>UT51-2005-D392<br>京都大学大学院農学研究科森林科学専攻<br>(主査)教授中坪文明, 教授武田博清, 教授太田誠一<br>学位規則第4条第1項該当

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Alfaress, Serine. "Integrated pest management strategies for a terrestrial isopod, Armadillidium vulgare, in no-till soybean production." Thesis, Kansas State University, 2012. http://hdl.handle.net/2097/13656.

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Master of Science<br>Department of Entomology<br>Brian P. McCornack<br>Robert J. Whitworth<br>No-till management of soybean benefits producers by lowering input costs and retaining soil moisture, but may also provide optimal conditions for increasing populations of soil-inhabiting pests. For Kansas soybean, damaging populations of soil-inhabiting isopods (Malacostraca: Isopoda) have been observed in fields under no-tillage management. To control damage to soybean stands from feeding isopods, current management strategies need to be evaluated. The objectives of my research were to evaluate the

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Georgis, Kidane. "The effect of fertiliser management practices on soil organic matter production in the semi-arid areas : a field and modelling approach." Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09AFP/09afpg352.pdf.

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Bibliography: leaves 155-169. Studies the effect of nitrogen fertilizer on dry matter production under differing watering regimes. Investigates the accuracy of different crop and soil organic matter models for predicting crop yield, nitrogen uptake and changes in soil organic carbon and nitrogen. Compares the models with data from long-term field experiments on wheat in Australia and sorghum in Ethiopia. Finds that a higher crop yield and better nitrogen and water utilisation can be achieved if addition of nitrogen fertilizer is balanced with soil water.

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Balayara, Assa. "An Invasive Fruit Fly, Bactrocera dorsalis (Tephritidae), on Mango in Senegal: Impact on Mango Crop Production and Value, Marketing Practices, and Management." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/81513.

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The oriental fruit fly, Bactrocera dorsalis Hendel, is an economic tephritid that invaded Senegal in 2004 (Vayssieres et al. 2011). This work determined 1) Impact of B. dorsalis on mango crop production and value, and marketing practices, 2) Effect of neem and kaolin on its behavior and development (laboratory and field), and 3) Effect of treated soil with neem seed cake (NSC) and neem seed powder (NSP) on the larval-pupal survival and development (laboratory and field). Results revealed crop value (price/kg) was associated with infestation levels. P<0.0001, crop value decreased in highly infe

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Burdack, Doreen [Verfasser], and Hans-Georg [Akademischer Betreuer] Petersen. "Water management policies and their impact on irrigated crop production in the Murray-Darling Basin, Australia / Doreen Burdack ; Betreuer: Hans-Georg Petersen." Potsdam : Universität Potsdam, 2014. http://d-nb.info/1218861746/34.

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Kilpatrick, Lindsay Anne. "Impacts of Biosolids and FGD Gypsum Application on Marginal Soil Quality and Production of Miscanthus as a Bioenergy Crop." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1339744690.

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Bampa, Francesca. "Options for climate change mitigation in agricultural soils and impact on crop and grassland production: a multi-scale study." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3424061.

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The decline of soil fertility is recognized by the European Union (EU) as the cause of yields reduction in many arable lands. The Soil Thematic Strategy proposed by the European Commission in 2006, identified the decline of organic matter as one of the main soil threats in EU. Organic carbon content is a recognised indicator of soil quality. Several studies have investigated this relationship through long-term field level experiments. This thesis presents a different approach: starting from data and information at EU level, a regional case study is investigated. The general objective of this

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Yakoub, Abdul Malek. "Mineral nitrogen fertilization and stover management effects on maize production under irrigated mediterranean conditions. Simulation of yields." Doctoral thesis, Universitat de Lleida, 2015. http://hdl.handle.net/10803/393878.

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The optimal N application rates were investigated with the effects of stover management on maize production and its possible interaction with N fertilization. A field experiment was conducted from 2010 to 2014. The rates of mineral N fertilization applied were: 0, 100, 200 and 300 kg N ha-1 year-1. Our results suggested that grain yield, biomass, grain and plant N uptake and SPAD-units were all greatly affected by N fertilization rates. Maximum yield values (19.93 and 19.20 Mg ha−1) were achieved with N application rates of 200 kg ha-1. Our results suggested that returning stover to the soil

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Cerda, Rolando. "Assessment of yield and economic losses caused by pests and diseases in a range of management strategies and production situations in coffee agroecosystems." Thesis, Montpellier, SupAgro, 2017. http://www.theses.fr/2017NSAM0004/document.

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Les pertes de récolte dues aux ravageurs et aux maladies constituent une menace sérieuse pour les revenus et la sécurité alimentaire de milliers de familles rurales dans le monde entier. L'évaluation de ces pertes de récolte (baisse de rendement et préjudice économique) et de leurs causes est nécessaire pour améliorer la mise au point d'agroécosystèmes capables d'offrir de bons rendements de culture, une régulation des ravageurs et des maladies et d'autres services écosystémiques. Ce mémoire de doctorat vise à contribuer à la recherche dans le domaine des pertes de récolte en proposant des app

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Bithell, S. L. "An evaluation of Solanum nigrum and S. physalifolium biology and management strategies to reduce nightshade fruit contamination of process pea crops." Lincoln University, 2004. http://hdl.handle.net/10182/1160.

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The contamination of process pea (Pisum sativum L.) crops by the immature fruit of black nightshade (Solanum nigrum L.) and hairy nightshade (S. physalifolium Rusby var. nitidibaccatum (Bitter.) Edmonds) causes income losses to pea farmers in Canterbury, New Zealand. This thesis investigates the questions of whether seed dormancy, germination requirements, plant growth, reproductive phenology, or fruit growth of either nightshade species reveal specific management practices that could reduce the contamination of process peas by the fruit of these two weeds. The seed dormancy status of these we

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Beyers, Hendrik Philippus. "The effect of haloxyfop-R-methyl ester and imazamox herbicides, tine or no tillage and nine different medic cultivars on the seed and dry matter production as well as the quality of medic pastures." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52517.

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Thesis (MScAgric)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: The aim of this study was to determine the effect of a grass herbicide, a broadleaf herbicide with some grass control capabilities, method of tillage (tine and no-tillage) at planting of wheat as well as different medic cultivars on the regeneration, dry matter (OM) production and quality of a medic pasture. The trial was conducted at Langgewens experimental farm in the Swartland wheat producing area. Nine medic cultivars of three different species were evaluated after being sprayed with either haloxyfop-R-methyl

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Robin, Marie-Hélène. "Analyse et modélisation des effets des pratiques culturales et de la situation de production sur les dégâts causés par les bioagresseurs des cultures. Application au blé d’hiver." Thesis, Toulouse, INPT, 2013. http://www.theses.fr/2014INPT0067/document.

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La protection intégrée des cultures (PIC) apparaît comme une stratégie durable de protection des plantes contre les bioagresseurs, satisfaisant les exigences à la fois économiques, écologiques et sanitaires auxquelles est confrontée l’agriculture. L’amélioration des connaissances sur les interactions entre les bioagresseurs et les pratiques agricoles est indispensable afin de concevoir des méthodes de lutte plus économes en produits phytosanitaires Le modèle IPSIM (Injury Profile SIMulator), développé dans ce travail de thèse, vise à simuler l’effet des pratiques culturales, du pédoclimat et d

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VAGLIA, VALENTINA ADA ROSA. "NEW RESEARCH ON AGROTECHNICS FOR ORGANIC RICE PRODUCTION AND THEIR SUSTAINABILITY ASSESSMENT." Doctoral thesis, Università degli Studi di Milano, 2022. http://hdl.handle.net/2434/924462.

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Questa tesi studia e valuta le tecniche agronomiche legate alla coltivazione del riso biologico nell'area del Nord Italia. Il finanziamento principale di questa tesi deriva dal progetto MIPAAF "Risobiosystems", iniziato nel 2017 e terminato nel 2020. Gli studi presentati sono collegati alla strategia europea di produzione alimentare sostenibile "Farm to Fork", che è il fulcro del Green Deal europeo per rendere i sistemi alimentari equi, sani e rispettosi dell'ambiente, incoraggiando l'espansione del settore dell'agricoltura biologica (Commissione europea 2020). Come riportato in letteratura,

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Pilon, Marcelo. "ESTRATÉGIAS DE AGRICULTURA DE PRECISÃO PARA DEFINIÇÃO DE ZONAS DE MANEJO EM SISTEMAS DE INTEGRAÇÃO LAVOURA PECUÁRIA." Universidade Federal de Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/4813.

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The Precision Agriculture is a great tool to assist and enhance the spatial and temporal management of agricultural activities. In this sense the site-specific management, provides an understanding of agricultural crops or livestock on smaller spatial scales than those adopted in conventional agriculture. For data acquisition and obtaining maps, the Electrical Conductivity of the soil, the Penetration Resistance and Chemical Analysis of the Soil were used because they are variables which correlate with factors for grain production. This study evaluated the data obtained in a reference unit of

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Kellman, Anthony W. "Rhizobium inoculation, cultivar and management effects on the growth, development and yield of common bean (Phaseolus vulgaris L.)." Diss., Lincoln University, 2008. http://hdl.handle.net/10182/378.

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Genotypic differences in growth and yield of two common bean (Phaseolus vulgaris L) cultivars to Rhizobium inoculation and management were investigated. In 2003-04, the two bean cultivars (Scylla and T-49) were combined with three inoculant treatments (strains CC 511 and RCR 3644, and a control of no inoculation), two fertiliser levels (0 and 150 kg N ha⁻¹) and two irrigation treatments (irrigated and rainfed). There was no nodulation on either cultivar. To further investigate the symbiotic relationship, 16 rhizobial isolates, including the two used in the first field experiment, were combined

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