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 13 of 13 for “"Us Corn Belt"”.
-
Using Remote Sensing and Machine Learning to Improve County-Level Crop Yield Prediction in the Us Corn Belt
… settings and are rarely deployed online and used by stakeholders. This dissertation aims to address these gaps by developing machine learning models to improve county-level crop yield prediction. This dissertation consists of three manuscripts. The first manuscript uses a geographically …
-
Application of multi-state financial data for use with the USDA Agricultural Conservation Planning Framework
… been an increasing concern across much of the US Corn Belt region, specifically with regards to excess nutrient pollution. Agriculturally dominated landscapes are one of the major contributors to impairments in waterways at both local and regional scales. As Iowa and other US Corn Belt states …
-
Using spontaneous haploid genome doubling to access favorable alleles in exotic maize (Zea mays L.) germplasm
… opportunity for broadening the genetic base of US Corn Belt germplasm. The in vivo doubled haploid (DH) technology is widely used into exotic germplasms because it has a great promise in purging mutational load of deleterious recessive alleles. Accounting for all the improvements of DH …
-
Genetic variation of the ribosomal DNA intergenic spacer of maize
… may be associated with a selective advantage in US Corn Belt environments.
-
Evaluation and Application of the Community Land Model for Simulating Energy and Carbon Exchange in Agricultural Ecosystems
… 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 agro-ecosystems using 54 site-years of data, improved its representation of …
-
Corn residue, tillage, and row spacing effects on soybean
Most soybeans [Glycine max (L.) Merr.] follow corn (Zea mays L.) in the US corn belt, and soybean seed is often planted without tillage into standing corn residue or, if tilled, into a considerable amount of corn residue left on or near the surface. The increase in corn residue with increasing corn …
-
Nutrient cycles across topography in drainage-impaired Corn Belt soils
Greenhouse gas emissions and nutrient leaching from Corn Belt soils pose a threat to both local and global human and environmental health. Topographic depressions in the US Corn Belt have documented impacts on hydrology, crop production, soil characteristics, and soil microbial communities. These …
-
Soybean nitrogen dynamics: Nitrogen fixation, yield, and residue decomposition
… of N to secure productivity and environmental sustainability. Soybean [Glycine max (L.) Merr.] is the second most important crop in the US Corn Belt, and it can fix part of its N through biological N fixation. The overarching goal of this research was to investigate soybean N fixation dynamics …
-
Discovery and characterization of genes controlling nitrogen utilization in maize
… nearly all maize grown in the U.S. and other industrialized nations, and the use of N fertilizer in developing countries is on the rise. While sufficient nitrogen fertilization contributes to increased maize yield and better nutritional quality, excessive N inflates the production cost, increases …
-
Human-nature relationships and nutrient management practices of Illinois farmers
… population. The participants are central to industrial agriculture in the US Corn Belt and thus the global challenge of nitrogen management evolving around the use of artificial fertilizers. Mitigation of the hypoxic zone in the Gulf of Mexico epitomizing this challenge necessitates the …
-
Physiological aspects of relative changes in nitrogen and plant density stress tolerances over a 38-year period of US maize hybrid introductions
… and nitrogen partitioning in organs (stem versus leaf) at silking and its impact on post-silking dry matter and nitrogen accumulation for different hybrid eras under a variety of management conditions; 2) evaluate historic improvement in source strength, including post-silking dry matter …
-
Life Cycle Assessment of Select Agricultural Practices: Assessing the Potential for Climate Mitigation
… also plays a role in contributing to the causes of global warming (IPCC, 2009). The present research examined current agro-management practices of select agriculture management practices and products with a threefold objective, namely i) to understand the possible impact of climate change on …
-
Three essays on water quality policy and valuation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms