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 30 for “"NUTRIENT LOSSES"”.
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CLIMATE CHANGE IMPACTS ON THE SOIL EROSION AND NUTRIENT LOSSES IN THE GREAT LAKES REGION
Pollutants from non-point sources (NPS) have become the primary reason for water quality degradation in the Great Lakes region after great progress has been made in reducing point source pollution through the enforcement of total maximum daily loads (TMDL). Climate change may impact NPS pollutant …
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Effective Modeling of Nutrient Losses and Nutrient Management Practices in an Agricultural and Urbanizing Watershed
… Manassas is experiencing eutrophication due to nutrient loads associated with agricultural activities and urban development in its drainage areas. Two watershed model applications using HSPF, and one receiving water quality model application using CE-QUAL-W2, were linked to simulate Lake …
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Financial costs and economic tradeoffs of alternative manure management policies on dairy and dairy/poultry farms in Rockingham County, Virginia
… 150-cow dairy and dairy/poultry farms. Current nutrient applications are manure-based, with each farm substituting poultry litter for commercial fertilizer. Potential field-level nutrient losses estimated by EPIC, a soil/plant growth simulation model, indicate the highest nitrogen losses on …
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Development of a continuous, physically-based distributed parameter, nonpoint source model
… transport of dissolved and sediment-bound nutrients, and nutrient transformations. The model was developed for use by nonpoint source pollution managers to study the long-tenn effectiveness of best management practices (BMPs) in reducing runoff, sediment, and nutrient losses from …
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Rodents and Restionaceae : sex-specific plant-animal interactions in dioecious plants
… Rhabdomys in C. congesta. Firstly I investigated nutrient resorption from senescing culms and considered the effects of reproductive effort (higher in females) and sex-specific nutrient losses. I found that nutrient resorption from mature culms was highly efficient in both sexes. Culm-felling by …
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Near-surface hydrology and hydrochemistry under contrasting land-cover
… an in-depth understanding of the water and nutrient cycle. On this basis we compared the involved hydrological pathways for rainfall to reach streams and the nutrient budgets of a tropical rainforest and a pasture. In addition we studied the links of hydrochemical differences to differences …
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Nutrient Management Planning on Virginia Livestock Farms: Impacts and Opportunities for Improvement
… to water bodies through the implementation of nutrient management plans on livestock farms. Study results indicate that nutrient management plans do result in significant reductions while maintaining or increasing farm income. Nutrient management plans on the four case farms reduced mean …
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Simulation of Runoff and Pollutant Loss in Urbanizing Watersheds
… The model predicted the hydrology and pollutant losses for the year 1999 from the Stroubles Creek watershed within 50% of the observed values after calibration. Prediction errors were much higher for the parking lot and dry pond simulation of the period of time from August 1995 to February 1996. …
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BMP Cost and Nutrient Management Effectiveness on Typical Beef and Beef-Poultry Farms in Shenandoah County, Virginia
… the change in whole-farm net revenues and nutrient reduction from the implementation of five best management practices (BMPs) on a typical beef and beef-poultry farm in Shenandoah County. Whole-farm net revenues, resource allocation, nutrient loss reductions, and the cost efficiency of …
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SOIL PHOSPHORUS AND NITROGEN EXPORT AND RETENTION IN RAINFALL RUN-OFF FROM MANURED LANDSCAPES
… in nitrogen (N) and phosphorus (P) due to excess nutrient application that is unused by crops. This can pose the risk of eutrophication of nearby surface water bodies receiving run-off. The objective of this study was to determine the effectiveness of precision variable rate application of feedlot …
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Nutritional and Management Practices to Reduce Excessive Nutrient Excretion on Dairy Farms
A 2-yr field study was conducted to reduce nutrient losses from Virginia dairy farms through nutritional and herd management practices. Ten collaborator herds were identified, all at state DHIA average or better for milk yield and days open. Baseline feed samples and ration information were …
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Extreme weather events in the upper Midwest: Implications on flood risk, crop yield, and water quality
… relationship between extreme precipitation and nutrient transport, revealing increased risks of nutrient losses under intensified precipitation scenarios. This comprehensive research provides valuable insights for enhancing community resilience, improving agricultural management, and developing …
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The Feeding Value of High Dry Matter Corn Silage
… with increasing plant maturity, field and nutrient losses, feeding value, and digestibility.</p>
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The effects of recent landuse on a fynbos site
… a 3 to 4 year rotation, possibly effecting net nutrient losses to the system. After 1960, unintentional burning occurred on average every 7 years. The Fynbos Site has been lightly browsed by livestock from 1920 to 1976 and bushcut between 1965 and 1970, with minimal long-term effects. Gravel …
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THE INFLUENCE OF PULSE CROPS ON SOIL PHOSPHORUS AVAILABILITY TO SUBSEQUENT WHEAT CROPS IN THE BROWN SOIL ZONE OF SASKATCHEWAN
… P supply to a following crop. Estimated nutrient losses from pulse residues weathering in the field between crop harvest and seeding of a subsequent crop the following spring were also minimal and are not expected to have significant effects on P uptake by the following crop. Field …
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Effect of bioenergy crops and fast growing trees on hydrology and water quality in the Little Vermilion River Watershed
… production. Flow, tile flow, erosion and nutrient losses were slightly reduced under bioenergy crop scenarios of <em>Miscanthus,</em> switchgrass, and hybrid poplar on highly erodible areas, marginal land and marginal land with forest. The increase in sediment load and nutrient losses …
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Temporal and Thermal Effects on Fluvial Erosion of Cohesive Streambank Soils
… on-site soil erosion problems such as soil and nutrient losses, and off-site soil erosion problems such as sedimentation of lakes and river, loss of navigable waterways, flooding and water quality impairment, has been estimated at 44 billion USD (Pimentel, 1995; Telles, 2011). While eroding …
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An integrated plant nutrition system (IPNS) for corn and cannabis in the Mid-Atlantic USA
… higher efficiency of input use, since mineral nutrient losses due to runoff, leaching, erosion and gas emissions are leading to environmental degradation. A huge variety of materials can serve as a crop nutrient supply and they can be derived from different resources. The integrated plant …
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Exploring Phosphorus Dynamics in Mid-Atlantic Soils: A Multi-Scale Analysis Integrating Soil Fertility and Land Management for Environmental Sustainability
… challenges for crop nutrition and water quality. Nutrient losses from row crop agriculture and poultry litter applications have potential to cause water quality impairments affecting the environment, aquaculture, and tourism industries. To address these concerns, this study investigated P …
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Nitrogen dynamics and biological response to dairy manure application
… in agronomic systems to supply essential crop nutrients and decrease dependency on chemical fertilizers. Liquid manures are traditionally surface broadcast to fields and sometimes incorporated to reduce odor and nutrient losses; however, incorporation is incompatible with no-till agriculture. …
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