Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 92 for “"crop rotation"”.
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Long-term effect of crop rotation and tillage on soil properties
Shifts in cropping systems from long-term rotations including forages to mostly annual crops has intensified tillage, and led to the development of conservation tillage practices such as no-till. There is a shortage of information about the interactive effects of rotation and tillage on soil …
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Carbon and nitrogen cycling and soil quality under long-term crop rotation and tillage
This Dissertation was approved for publication on 2016-12-22 at 11:25.
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Evaluation of Tillage, Crop Rotation, and Cover Crop Impacts on Corn Nitrogen Requirements in Southeastern South Dakota
… while also considering effects from cover crops and crop rotation. This was a two year study conducted at the SDSU Southeast Research Farm near Beresford, SD; it was superimposed on a long-term rotation and tillage study established in 1991. Treatments included applied N rates of 0, 40, 80, …
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Studies on the Use of Herbicides for Control of Wild Garlic (Allium Vineale L.) in a Winter Wheat-Soybean Double Crop Rotation (Chlorsulfuron, Dpx T6376)
The response of wild garlic (Allium vineale L.) to two sulfonylurea herbicides, chlorsulfuron (2-chloro-N-(((4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino)carbonyl)benzenesulfonamide), and DPX T6376 (methyl-2-((((4-methoxy-6-methyl-1,3,5-triazin-(2-yl)amino)carbonyl)amino)sulfonyl)benzoate), was …
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A Case-Based Reasoner for Evaluating Crop Rotations in Whole-Farm Planning
… Case-Based Reasoning (CBR) system that evaluates crop rotations for their soil erosion and risk of insect pest problems. The purpose of this system is to provide decision support for an automated whole-farm planner (CROPS). CROPS (Buick et al., 1992) generates crop rotation plans that can address …
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Phosphorus cycling in organic systems
… use in organic systems means farmers rely on crop rotation or approved inputs to supply P for crops. Legumes in crop rotation add P to soil through decomposition and deposition, and approved fertilizers such as bone meal (BM), rock phosphate (RP), and composted manure add P to soil through …
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Multi-temporal Remote Sensing of Changing Agricultural Land Uses within the Midwestern Corn Belt, 2001-2015
… use and management practices in recent decades. Cropland expansion, crop rotation change, and crop phenology changes could lead to divergent environmental impacts on linked ecosystems. The overall objective is to examine agricultural land use and management changes and their impacts on water …
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Modeling the profitability of Camelina Sativa as a biofuel feedstock in eastern Colorado
… chooses to integrate camelina in the preexisting crop rotation cycle common in northeastern Colorado. This economic evaluation is measured against various per gallon diesel fuel price levels. The crop rotation cycle includes a corn planting, a fallow period, and a wheat planting. Camelina is grown …
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Crop Rotations for Sustainable Intensification
This dissertation investigates how crop rotation design and nitrogen (N) management can contribute to achieving high and stable yields while improving nitrogen use efficiency (NUE) in arable cropping systems. The research is based on a long-term crop rotation experiment conducted at a high-yielding …
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Evaluating greenhouse gas emissions from Illinois agriculture systems
Many Illinois cropping systems rely on nitrogen (N), which is an essential element and usually a limiting factor in corn (Zea mays, L.) production; yet N build-up in the soil might lead to nitrate (N-NO3) leaching, and release of nitrous oxide (N2O) by denitrification, thus contributing to both …
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Evaluating the effect of foliar insecticides on suspected Bt-resistant western corn rootworms in rotated soybean
… inflict substantial yield loss. Historically, crop rotation was a successful management strategy because oviposition occurred predominantly in cornfields. However, beginning in 1995, crop rotation failed to adequately manage larval injury to first-year corn in east central Illinois and …
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Defining functional microbiomes of wheat (Triticum aestivum) and maize (Zea mays), under regenerative management practices, in South Africa
… influence the rhizosphere microbiome of cereal crops, focusing on two complementary systems: wheat grown under controlled regenerative conditions in the Western Cape, and maize cultivated by commercial farmers in the Free State and KwaZulu-Natal. Together, these studies aimed to elucidate how …
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Reconstructing and interpreting ancient crop management practices : ethnobotanical investigations into traditional dryland farming in northern Jordan.
… an investigation into the effects of different crop management practices on weed composition. The aim of this research is to enable the reconstruction of ancient crop management practices from archaeological weed assemblages and to inform archaeological interpretation, i.e. to interpret what the …
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An assessment of conservation agriculture adaption by smallholder farmers : a case of Goromanzi, Zimbabwe
… known for its benefits of promoting better crop yields and soil fertility in a sustainable way as a climate adaptation strategy. This study assesses factors influencing the adoption of conservation agriculture by smallholder farmers in Goromonzi District, Zimbabwe. The study focuses on the …
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Belowground impacts of regenerative agriculture in a South African seed production system
… “mulching combined with compost” (MC), “cover cropping” (CC), and crop rotation. To determine the changes in soil fauna community assemblages and species richness, two components of the belowground fauna were investigated. Firstly, arthropod diversity indices were compared between conventional …
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Stenocarpella Maydis: Identification, Management, and Population Diversity
… causal agent of DER, ii) evaluate the effect of crop rotation and tillage on DER severity, iii) determine the survival period of S. maydis in corn residue at different soil depths in a corn field, and iv) identify genetic diversity among S. maydis isolates collected from the Midwestern and …
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The role of digestive proteases in the rotation-resistant phenotype of the western corn rootworm, Diabrotica virgifera virgifera (Coleoptera: Chrysomelidae)
… this pest was successfully controlled by annual crop rotation, alternating maize with a non-host plant like soybean. However, massive adoption of maize-soybean rotation in east-central Illinois selected for a WCR phenotype that circumvents crop rotation by laying eggs outside of maize fields. …
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Optimal Management of a Common Property Pest Under Risk: An Application to the Corn Rootworm
… model. Two control actions, soil insecticide and crop rotation, are included. The effect of crop insurance and improved scouting accuracy on insecticide use is evaluated. The rootworm population is considered to be a common property resource with an exhaustible stock of susceptibility to …
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Implications of conservation agriculture narratives on environmental conservation in Chibombo,Zambia
… was dominant. It claims that herbicide use and crop residues lower weed pressure in CA. Famers supported this narrative but argued that some weeds were becoming resistant to herbicides. Furthermore, farmers reported herbicides as being expensive. Hence, they reverted to conventional weeding …
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