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 19 of 19 for “"Nitrogen leaching"”.
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Impacts of Landscape Position and Nitrogen Fertilizer on Soils, Carbon and Nitrogen Leaching, and Greenhouse Gas Fluxes from Switchgrass Production in South Dakota
… this study were to (i) evaluate the impacts of nitrogen fertilization rate (N rate) and landscape position on soil pH, soil organic carbon (SOC), total nitrogen (TN), bulk density (ρb), and phosphorus (P) in switchgrass field; (ii) assess the impacts of the N rate and landscape position on …
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Bioproducts and environmental quality: biofuels, greenhouse gases, and water quality
… explores the tradeoff between GHG emissions and nitrogen leaching associated with biofuel production using general equilibrium models. The first essay develops a theoretical general equilibrium model to calculate the second-best GHG tax with the existence of a nitrogen leaching distortion. The …
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Analyzing the Economic and Environmental Impacts of Agricultural Alternatives - the Case of Virginia's Eastern Shore
… estimate the potential soil erosion, pesticide leaching and runoff, nitrogen leaching, and phosphorous runoff for different scenarios. The model shows that some of the new vegetable commodities could substantially increase the net returns of the farming operations in question. Romaine and Boston …
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ASSESSING THE IMPACTS OF ORGANIC AMENDMENTS ON DISTURBED SOIL PROPERTIES, WATER QUALITY AND VEGETATION GROWTH
… soil fertility, and nutrient transport via leaching/runoff. Greenhouse and laboratory experiments were conducted to assess the potential use of these OAs for roadside projects.One set of experiments (greenhouse tub studies) focused on three OAs (leaf compost, shredded aged wood mulch, …
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Regional Nutrient Budgets in Forest Soils in a Policy Perspective
… deals with the nutrient sustainability regarding nitrogen, calcium, magnesium and potassium on a regional scale in Swedish forests, and the potential effects of forests on carbon sequestration. It includes method development of regional weathering rate modelling, regional budget calculations for …
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Assessment of Exceptional Quality Biosolids for Urban Agriculture
… objectives were: 1) to quantify plant available nitrogen (PAN) of new EQ biosolids in a greenhouse bioassay; 2) to quantify PAN of EQ biosolids applied to an urban degraded subsoil via tall fescue N fertilizer equivalency, and compare field results to laboratory tests; 3) to investigate EQ …
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Carbon and nitrogen dynamics on a forest site receiving continual papermill sludge applications: a soil column study
… soil changes associated with carbon (C) and nitrogen (N) cycles within the soil/plant system. The C, N, and hydrologic cycles within a soil/sludge system receiving a year-round, daily application of paper mill sludge were studied. Soil samples were collected from three locations on a land …
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INTEGRATED TERRITORIAL APPROACH FOR SUSTAINABLE AGRICULTURE: NITROGEN MANAGEMENT AND SOIL CARBON SEQUESTRATION IN LOMBARDY REGION
… concerns, being partially responsible of nitrogen pollution and CO2 emissions caused by carbon loss from soil. That’s particularly true in Lombardy region, due to the presence of more than 27% of cattle and 51% of pigs of the national livestock and due to the extent of area devoted to …
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Leaching and denitrification losses of nitrogen from corn fields as influenced by conventional- and no-till practices in soils of the Chesapeake Bay area
… practice and N fertilizer application rates on N leaching and denitrification losses from corn fields. Three well known models - the NTRM, CERES- Maize, and VT-MAIZE - were also tested to determine their predictive ability of N distribution in soil and crop, the various components of the N cycle, …
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Changes in Soil Nitrogen Following Biosolids Application to Loblolly Pine (Pinus Taeda L.) Forest in the Virginia Piedmont
… of biosolids as an alternative source of Nitrogen (N) is becoming a common silviculture practices on loblolly pine forest. However, little is known about how biosolids type, application rate, and timing affect forest floor and soil N availability in pine plantations. The objectives of this …
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A biogeochemical analysis of Miscanthus x giganteus under nitrogen fertilizer treatments and across multiple soil types
… to be highly productive with minimal inputs. Nitrogen (N) fertilization is being studied to see if M. x giganteus productivity is increased as well as potential environmental impacts. It is important to understand the effects of N fertilizer on M. x giganteus across a range of soil types and …
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The potential implications of bioenergy crop production for water and energy balance and carbon and nitrogen dynamics in the United States
… water and energy balance and coupled carbon and nitrogen dynamics in the US. To achieve this objective, I apply and extend a coupled biogeochemical and biogeophysical model, the Integrated Science Assessment Model (ISAM), to develop a dynamic crop growth model for specific row crops (corn and …
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Nitrogen Cycling from Fall Applications of Biosolids to Winter Small Grains
Environmental concerns about winter nitrogen (N) leaching loss limit the amount of biosolids applied to winter small grains in Virginia. Ten field studies were established 2012-2014 in Virginia to determine the agronomic and environmental feasibility of fall biosolids applications to soft red …
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Effect of winter cover cropping practices on maize yield and nutrient cycling
… has set Phase 1 reduction milestones for nitrate-nitrogen and total phosphorus of 15 percent and 25 percent, respectively, to the Mississippi River by the year 2025 with the ultimate goal of a 45 percent reduction for both nutrients when compared to average annual riverine loading for years …
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Nitrogen Management in No-till Winter Wheat Production Systems
… N rate prediction methods, or potential NO3 leaching under no-till wheat in soils and climate similar to the mid-Atlantic region. The objectives of our research were: (1) to determine economic optimum N fertilization rates and timings; (2) evaluate selected methods for predicting optimum N …
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The effects of winter cover cropping on nutrient leaching through repacked soil columns
… and understand the potential decrease in nitrogen and phosphorus loss through tile drainage due to cover crops, as well as compare the amount of nitrogen and phosphorus available in the soil at cash crop planting, with and without a cover crop. Information from a method development period …