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 22 for “"Crop Type"”.
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Producer Preferences for Alternative Irrigation Practices in the Arkansas Delta
… scheduling, flowmeters, and more efficient row crop water application systems will allow producers to better manage water resources. We find relatively large, positive relationships between belonging to a peer network of the same irrigation practice and participation in that practice. Intensity …
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Intra-field Nitrogen Estimation for Wheat and Corn using Unmanned Aerial Vehicle-based and Satellite Multispectral Imagery, Plant Biophysical Variables, Field Properties, and Machine Learning Methods
… the right rate, time, and place depends on the crop type, desired yield, and field conditions. The objective of this study is to use Unmanned Aerial Vehicle (UAV) multispectral imagery, PlanetScope satellite imagery, vegetation indices (VI), crop height, leaf area index (LAI), field topographic …
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Legacy effects of cover crop monocultures and mixtures on soil inorganic nitrogen, total phenolic content, and microbial communities on two organic farms in Illinois
Cover crops can leave behind legacy effects on their soil environments by influencing soil inorganic nitrogen (N) pools, total phenolic content through the release of secondary compounds, and by altering soil microbial communities. I analyzed soils collected during a two-year field study and aimed …
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Assessment of perennial bioenergy buffers within a row crop production system
… to achieve long-term sustainability (e.g. crop productivity potential) and minimal downstream effects (e.g. externalities such as eutrophication and hypoxia). One approach to addressing these challenges is through the development and implementation of multifunctional landscape designs which …
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Polarimetric SAR for the monitoring of agricultural crops
The monitoring of agricultural crops is a matter of great importance. Remote sensing has been unanimously recognized as one of the most important techniques for agricultural crops monitoring. Within the framework of active remote sensing, the capabilities of the Synthetic Aperture Radar (SAR) to …
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Data-intensive crop knowledge discovery in the era of cybergis and machine intelligence
… it is critically important to obtain timely crop information such as yield potential and growing conditions as crop information is often time sensitive for societal applications. With rapidly advancing remote sensing technologies such as satellite- and UAV-based approaches of fine-resolution, …
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BlueBird: national-scale real-time crop cover classification using multi-stage deep learning approach
An effective real-time crop cover classification prediction is essential to real-time large-scale crop monitoring. High resolution satellite optical data containing distinguishable signals of different crop types have been used by recent crop cover classification studies. However, existing works …
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Productivity, Carbon Sequestration, Nutrient Accumulation, And Species Interactions In Perennial Biomass Alley Cropping Systems
… and production potential for biomass crops in agroforestry systems. Our objectives were to evaluate the potential for biomass feedstock production, nutrient uptake and accumulation, and carbon sequestration in alley cropping agroforestry systems at two Minnesota sites, and to determine …
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ADVANCING NATIONAL-SCALE HIGH-RESOLUTION CROP MAPPING USING REMOTE SENSING
… on accurate, spatially explicit information on crop distribution. This dissertation advances national-scale crop type mapping in large countries by integrating remote sensing, sample-based field surveys, and machine learning to support both long-term and near-real-time agricultural monitoring. …
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Spatial and temporal estimation of pumping and recharge in groundwater system analysis
… water requirement is a function of the crop type, crop development, soil properties, and rainfall; all of which vary in space and time. A portion of this dissertation work is directed at the development of a GIS-based method for estimating irrigation demand that incorporates these …
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Sorption and bioaccumulation of neutral and ionizable wastewater-derived contaminants of emerging concern: exposure of edible crops via solid and liquid effluent streams
… into edible portions of strawberry and lettuce crops. Two flame retardant chemicals, tris (1-chloro-2-propyl) phosphate (TCPP) and tris (2-chloroethyl phosphate (TCEP) and several polar pharmaceuticals accumulated in a concentration-dependent manner in lettuce (Lactuca sativa) irrigated with …
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Reduced Chemical Weed Control Options in Virginia for Corn and Turfgrass and Characterization of Sorghum halepense Expressing Multiple Resistance to Nicosulfuron and Glyphosate
… those resistances. Rye and hairy vetch cover crop residues, combined with reduced rates of preemergence herbicide and postemergence glyphosate applications, were shown to provide sufficient weed control and corn yield. Cover crop type or residue level did not augment weed control in corn …
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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
… of an agroecosystem, forms the base for cropping systems and how it is managed matters. My research focused on investigating how two ecologically-based soil management techniques, cover cropping (using a species mixture of Cichorium intybus, Raphanus sativus, Medicago sativa, Trifolium …
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Earth observation technologies for improved agricultural decision support systems in South Africa
… practices in South Africa, focusing on crop monitoring, water use efficiency, and land management. Firstly, a systematic review of remote sensing applications in Southern African agriculture, evaluating key advancements, challenges, and opportunities was conducted to document the key …
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How growers make decisions impacts plant disease control
… model to investigate the deployment of crop that is either resistant or tolerant to Tomato Yellow Leaf Curl Virus (TYLCV). We find that when growers used resistant crop, higher yields were achieved by both controllers and non-controllers, though widespread use of resistant crop was not …
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Assessing long-term conservation of groundwater resources in the Ogallala Aquifer Region using hydro-agronomic modeling
… often due to providing irrigation water for crop cultivation. The High Plains Aquifer (HPA) is the largest freshwater aquifer in the United States and has experienced severe depletion in the past few decades due to excessive pumping for agricultural irrigation. There is a need to determine …
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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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Heterogeneous Nitrogen Losses: Cost-Effectiveness Analysis of Changes in Management Across South Dakota
… not spatially homogenous, nor homogenous across crop production systems. The objective of this study is to begin to spatially account for the heterogeneous nitrogen losses from nitrogen fertilizer applications on South Dakota farms. This study conducts a cost-effectiveness analysis (CEA) to …
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Understanding seed-soil adhesion by myxospermous seeds and their biophysical function in agroecosystems
… (No-Till, conventional and deep plough) and crop type (winter and spring barley) treatments shaped the presence, composition and abundance of functional groups. These results are biologically meaningful as the presence of functional groups (e.g. containing myxospermous species) within fields …
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Closing the loop: Assessing the viability and environmental risks of human excreta-derived fertilizers in sustainable food systems
… different facets of environmental health (e.g. crops, water and soil) and finally, considered societal benefits and public acceptance of HEDFs. We concluded that HEDFs are nutrient-rich, high potential fertilizers that can have a positive impact on the environment, but the response is soil and …
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