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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 62 for “"Agroecosystem"”.
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The role of cover crops in agroecosystem functioning
Current interest in cover cropping is focused on enhancing ecosystem services beyond soil conservation. Cover crop (CC) species function uniquely in their effects on ecosystem services when grown in monoculture or mixtures. This research integrated field experiments and a literature synthesis to …
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Agroecosystem management strategies and trophic interactions among herbivores, pathogens and predators
… the restoration of vegetation diversity in agroecosystems and the adoption of management strategies aiming to reduce impacts on natural enemy populations are practices that can be employed in different types of farming systems. Much of the conservative biological control efforts are focused …
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Survival and space use of riparian muskrats (Ondatra zibethicus) within an agroecosystem
… ditches within highly altered, human-dominated agroecosystems. To evaluate home ranges and space use of riparian muskrats, I monitored movements of radiomarked individuals occurring in small streams and agricultural ditches. I used an information-theoretic approach to determine the effects of …
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Mapping agroecosystem management practices from space and quantifying their impacts on crop productivity
… and outlook of this dissertation for sustainable agroecosystems. This study contributes to understanding dynamics in agricultural management practices from satellite remote sensing and providing observation-based evidence to inform agricultural management and government policies for sustainable …
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Assessing nutrient management strategies on agroecosystem productivity and sustainability in the U.S. Midwest
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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Assessing cover crop impacts on agroecosystem productivity and sustainability in the U.S. Midwest
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-12-01
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Use of restored grasslands by mammals in a dynamic agroecosystem: insights from camera trapping
… on 30 restored grassland sites in a dynamic agroecosystem in Illinois from 2014 to 2015. I tested hypotheses about the effects of local habitat conditions and landscape context on use of restored grasslands by four focal species: raccoons (Procyon lotor), eastern cottontails (Sylvilagus …
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Is Everything Connected? Following the Predators, Pests, and Plants Within a No-Till, Western Montana Agroecosystem
Agricultural systems are being re-engineered with hedgerows, living mulches, or minimum tillage activities in hopes of retaining populations of beneficial, predatory insects that may decrease the need for pesticide use. The purpose of this research was twofold. First, this on-farm research assessed …
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Is Everything Connected? Following the Predators, Pests, and Plants Within a No-Till, Western Montana Agroecosystem
Agricultural systems are being re-engineered with hedgerows, living mulches, or minimum tillage activities in hopes of retaining populations of beneficial, predatory insects that may decrease the need for pesticide use. The purpose of this research was twofold. First, this on-farm research assessed …
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Direct and Indirect Effects of Elevated Carbon Dioxide and Ozone on the Canopy of a Soybean Agroecosystem
It is unknown how rising atmospheric CO2 and O3 will directly and indirectly alter canopy structure and scale to affect ecosystems. I determined how leaf area index (LAI) was directly affected by elevated [CO 2] and [O3]. By increasing photosynthetic efficiency, elevated [CO2] may increase maximum …
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Ecorestoration of riparian forests for nonpoint source pollution control: Policy and ecological considerations in Illinois agroecosystem watersheds
The Central Corn Belt Plains Ecoregion of Central and Northern Illinois has a significant nonpoint source water quality problem that is not being successfully addressed by current agroenvironmental policy. Trend analysis showed that concentrations of nitrate, dissolved phosphorus, and total …
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The Use of Buckwheat Border Habitats to Attract Natural Enemies of Cucumber Beetles in a Cucurbit Agroecosystem
… pests of cucurbits, was assessed in a cucurbit agroecosystem by using buckwheat (Fagopyrum esculentum Moench) border habitat to attract the natural enemies, Celatoria diabroticae (Shimer) and Celatoria setosa (Coquillett) (both Diptera: Tachinidae) and Chauliognathus pennsylvanicus (Deg.) …
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Ecology of the stalk borer Papaipema nebris (Guenee), (Lepidoptera:noctuidae), in the southwestern Virginia no-till corn agroecosystem
The stalk borer (SB), Papaipema nebris Gn. exhibited from 7 to 9 instars when reared on a meridic diet in a control-led environment. Both sexes went through variable numbers of instars before pupation. Head capsule width measurements did not form discrete sets, and overlap occurred between adjacent …
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Plant diversity and its effects on populations of cucumber beetles and their natural enemies in a cucurbit agroecosystem
Populations of striped cucumber beetles (<i>Acalymma vittatum</i> Fabr.), spotted cucumber beetles (<i>Diabrotica undecimpunctata howardi</i> Barber), western cucumber beetles (<i>Acalymma trivittatum</i> Mann.), Pennsylvania leatherwings (<i>Chauliognathus pennsylvanicus</i> DeGeer), Diptera …
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Molecular detection, quantification and characterization of extended-spectrum β-lactamase (ESBL)- and AmpC-encoding genes in a cucumber agroecosystem
Antimicrobial resistance (AMR) is a major concern in health care, and has more recently been reported in environmental and agricultural settings. The presence of antibiotic resistant bacteria (ARB) (including extended-spectrum β-lactamase (ESBL)-producing Enterobacteriaceae) in fresh produce, is …
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Exploring Diversified Vineyard Ecological Soil Management Strategies: Impacts of cover cropping, Spanish River Carbonatite, and smooth pigweed (Amaranthus hybridus) interactions on an agroecosystem
Agroecosystems are one of the most heavily managed ecosystems that provide essential services for human well being. Intense management of agroecosystems has led to global degradation of soil and reduced biodiversity, two of the major challenges faced by agriculture today. Soil, the foundation of an …
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An Approach to Using Labile Soil Nitrogen Measurements for Calibration of the Dssat-Century Agroecosystem Model for Site-Specific Nitrogen Fertilizer Management in Illinois, Unites States
Finally, the DSSAT-CENTURY was employed to investigate whether it was possible to develop relationships between the modeled variables and soil N fractions as the ISNT. If such relationships can be identified, it should be possible to use site-specific measurements of soil N fractions to better …
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A multifarious comparative ecotoxicological approach on a catchment scale from three mine wastelands for improved environmental management and risk assessment: integrating abiotic, biotic and agroecosystem approaches
Metal mobilization under acid or neutral rock drainage represents one of the major environmental impacts associated with mining of sulphidic minerals. To avert this, suitable handling of mine overburden material, waste rock, open pits and tailing storage facilities (TSF) is needed. This study …
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The construction of a South African knowledge base for environmental management and monitoring of transgenic soybean, maize and cotton
… the technology and understand its place in the agroecosystem and broader environment, and for environmental education to engage agricultural biotechnology so that the benefits and hazards of the new technology are communicated to farmers, regulators and the public. Modern information technology …
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