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.
Results
Showing 1 to 11 of 11 for “"crop modeling"”.
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Crop modeling for assessing and mitigating the impacts of extreme climatic events on the US agriculture system
… such as heat waves and droughts. Process-based crop and cropping system models are important tools for climate change impact assessments and risk management. As data- science is becoming a new frontier for agriculture growth, the incoming decade calls for operational platforms that use …
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Evaluation of nitrogen management strategies and policies using high-throughput crop simulations
… complex interactions between weather, soil, and crop processes, matching N supply and crop N demand to minimize N losses is difficult to achieve. Sub-applications result in low yields, and over-applications result in environmental losses that harm water quality. These difficulties create what is …
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Utilization of water and light resources by annual crops under semi-arid conditions when planted between Leucaena leucocephala (Lam.) de Wit hedgerows
… of poor chemical and physical constitution make crop production difficult and seldom sustainable. To some this problem represents a conundrum to be solved, to others an inconvenience to be avoided. Reduction of agricultural risk in these communities can be addressed in numerous ways, but should …
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Modeling the Food-Water Nexus: A Spatio-temporal Accounting of Agricultural Land and Water Use in the United States
… requires an integrated understanding of how croplands and water use have evolved through time, and how more efficient management can support agricultural production without expanding water withdrawals. This dissertation developed a unified, high-resolution framework linking agricultural land …
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Investigation of climate variability and climate change impacts on corn yield in the Eastern Corn Belt, USA
… maintain environment integrity. However, a solid modeling application requires a clear understanding of crop responses under various climate stresses. This is especially important for evaluating future climate impacts. Therefore, correct representation of corn growth and yield projection under …
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Modeling salt movement and halophytic crop growth on marginal lands with the APEX model
Saline soils negatively impact crop productivity in nearly 20% of irrigated agricultural lands worldwide. Cultivation of highly salt-tolerant plants, or halophytes, may increase productivity compared to conventional salt-sensitive crops (i.e., glycophytes), thereby increasing the economic potential …
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Evaluation and improvement of CERES-Maize evapotranspiration simulations under full and limited irrigation treatments in northern Colorado
… non-water sensitive growth stages. Savings in crop evapotranspiration (ET) could then be leased to municipalities or other entities as desired. This dissertation examined the benefit of limited irrigation in comparison with full irrigation in the northern Front Range of Colorado, in both an …
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Climate change impacts on agricultural vegetation in sub-Saharan Africa
… negative climate change impacts by adapting crop management to changing climate is a second objective of the thesis. As a precondition for simulating climate change impacts on agricultural crops with a global crop model first the timing of sowing in the tropics was improved and validated as …
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Evaluation and Application of the Community Land Model for Simulating Energy and Carbon Exchange in Agricultural Ecosystems
… (CMIP5), however, did not include process-based crop models with comprehensive physiology and phenology. One of the most widely used LSMs, the Community Land Model (CLM), has only recently included prognostic crops (CLM4-Crop). This thesis research evaluated the CLM4-Crop LSM for corn and soybean …
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A tripartite study on Bayesian estimation of photosynthetically active radiation, impacts of future climate, and adaptation strategies on crop production: a spatial model framework for the Eastern Kansas River Basin
… adaptation strategies on rainfed and irrigated cropping systems in the Eastern Kansas River Basin (EKSRB; a historically wetter portion of the Great Plains) have not been well-reported. While there are regional-to-global scale climate impact analyses, they rarely provide insights into management …
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Improving satellite data interoperability: Large-scale data integration and agricultural applications in the US Midwest
… the third study introduces a method of real-time crop stress monitoring enabled by predicting the Green Chlorophyll Vegetation Index (GCVI) with a neural network. The algorithms and methods proposed in this thesis contribute to the scalability and interoperability of satellite data. The thesis …