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 193 for “"cropland"”.
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Climate and Agricultural Cropland Use in Puerto Rico
Made available in DSpace on 2014-12-05T20:48:22Z (GMT). No. of bitstreams: 1 0007861.pdf: 5873538 bytes, checksum: 7f832b211ca603253f312c7dc2126e98 (MD5) Previous issue date: 1954
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An assessment of cropland application of alum sludge
Previous research has shown that crop land application of alum sludge can be a valuable method of residuals disposal and has been demonstrated to cause no adverse effects on soil properties and crop yields. Studies have shown that with good soil management practices essential plant macronutrient …
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Three essays on conservation practice adoption and cropland allocation
… role of the Chinese government in influencing cropland allocation decisions. Chapter 2 and Chapter 3 focus on the adoption of conservation practices. Chapter 2 studies the impact of enrollment restrictions on farmers’ adoption of conservation practices, using a survey of Iowa farmers. The …
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Optimal Conjunctive Management of Supplemental Irrigation Reservoirs and Cropland
Most claypan soil areas have inadequate groundwater supplies to provide wells for irrigation. Therefore, the establishment of reservoirs for storing rainfall and runoff water, seems to be the most likely source of irrigation water in such areas. However, the storage of runoff water for later reuse …
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Investigating Grassland and Cropland Conversion Decisions in the Dakotas, 2015 Producers Survey and Analysis
<p>This study investigates grassland and cropland conversion decisions in the Dakotas. Data from a 2015 survey completed by 1,026 producers located in 57 counties of the Prairie Pothole Region (PPR) were used to evaluate land conversions. This thesis attempts to identify the land use conversion …
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A numerical study of cropland-atmosphere feedbacks by incorporating a crop growth module in the WRF model
This study investigates cropland-atmosphere feedbacks in the Midwestern United States. Growing crops impact local climate during the growing season by influencing heat, moisture and momentum exchange between the land and the atmosphere. These changes in turn affect the crop growth, thus completing …
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Simulating the Impacts of Land-Use Land-Cover Changes on Cropland Carbon Fluxes in the Midwest of the United States
<p>Understanding the major drivers of the cropland carbon fluxes is important for carbon management and greenhouse gas mitigation in agriculture. Past studies found that agricultural land-use and land-cover (LULC) changes, such as changes in cropland production technologies, tillage practices, and …
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Quantifying Crop Yield, Bioenergy Production And Greenhouse Gas Emissions From Cropland And Marginal Land Using A Model-Data Fusion Approach
… and the least GHG intensive at a given cropland. Regional model simulations suggested that, substituting <em>Miscanthus</em> for maize to produce biofuel could potentially save land and reduce GHG emissions.</p> <p>Since growing biomass from marginal lands is becoming an increasingly …
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Projecting corpland rental rate and asset values : using a hybrid of past approaches to harvest new estimates
… operations has been boosted by increases in cropland values, but lower crop prices mean many are concerned that cropland prices could fall again. This thesis develops an economic model that can be used to project farmland values, cropland rental rates and other variables related to land …
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The impact of including water constraints on food production within a CGE framework
… livestock and managed forestry-five land types-cropland, pasture land, managed forest land, natural grass land and natural forest land-and conversion among these land types. I further develop this framework by describing crop production as the aggregate production of crops grown on irrigated and …
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Land-use change effects on soil organic carbon, total soil nitrogen, and soil erosion in a temperate forest and grassland
… sites were used in the study, one a forest and cropland on a loess-derived Alfisol in Southern Illinois and the other a prairie and cropland on a Mollisol derived from loess over glacial till in Western Iowa. Tree ring data suggest that the forested site has been intact for about 70 years, …
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Land Surface Phenologies and Seasonalities Using Cool Earthlight in Temperate and Tropical Croplands
… floods), a comprehensive understanding of global cropland dynamics is critically needed. Land surface parameters derived from the passive microwave Advanced Microwave Scanning Radiometer on EOS (AMSR-E) and AMSR2 data enable monitoring of cropland dynamics and they can complement visible to near …
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A systems approach to evaluate water quality oriented land management plans
… model, was developed to evaluate and optimize cropland Best Management Practices (BMPs). The approach consisted of using the Finite Element Storm Hydrograph Model (FESHM) to simulate runoff and sediment yield from a series of design storms with known return periods. The design storm simulations …
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How many people can China feed? : assessing the impact of land and water constraints
… model specifies the spatial allocation of cropland and water, subject to various physical constraints. As more land is used for crops, more water is consumed by agriculture. The model's water constraints are based on steady- state, annual water balances for major river basins and …
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Influence of the Conservation Reserve Program and Landscape Composition on the Spatial Demographics of Prairie Grouse in Northeastern South Dakota
… of acres of native prairie have been lost to cropland conversion within the original range of prairie grouse in North America. Conversely, the Conservation Reserve Program (CRP) of the Federal Food Security Act of 1985 converted millions of cropland acres back to perennial grassland. These …
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Analysis of Cash Value Trends of Agricultural Lands in South Dakota
… include that the main variables that influence cropland values are interest rates, corn revenue percentage measure, rental rates and population density. Among these variables, cropland values respond the most to interest rates and to corn revenue as a percentage of total revenue. However, there …
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Changing Land Use in the Rural-Urban Fringe: A Case Study of Southwest Grand Forks
… The predominant land use in 1954 was cultivated cropland, which covered 80.5 percent of the total study area. By 1980 cropland had declined to 26.7 percent of the total, with urban land uses such as single family residential, strip development and shopping center making significant increases. As …
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Effects of Wind Turbines On Nongame Birds in Conservation Reserve Program Grasslands in Southwestern Minnesota
… wind turbines was compared with that found in cropland, pastureland, woodland, and CRP grasslands without the presence of wind turbines. Bird species composition and density were determined within fixed width (40 m) transects. Nongame bird species richness and density were greater in woodlands …
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