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Showing 1 to 12 of 12 for “"Phosphorus Losses"”.
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Phosphorus Losses in Runoff from Virginia Soils
Previous research shows that dissolved P losses in runoff are well related to soil test P (STP), thus, various P loss prediction models incorporate the use of a STP vs. runoff DRP relationship. However, the relationship between STP and runoff DRP will vary based on soil type due to differences in …
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Factors influencing phosphorus losses in agroecosystems dominated by tile drainage
Phosphorus is an important macronutrient for crop production but phosphorus surpluses may be conveyed from diffuse sources to streams via surface runoff and artificial subsurface (perforated plastic pipes called tiles) drainage affecting the quality of receiving aquatic ecosystems. However, …
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Phosphorus Losses from Simulated Dairy Mangement Intensive Grazing Forage System
… conducted to evaluate how these systems affect phosphorus (P) loss from the Center through runoff and forage removal. The goal of this study was to investigate the effects of forage type and manure density on P levels in runoff from release plots that simulated a MIG dairy system. Two forage …
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Phosphorus Losses From Simulated Dairy Land Uses of Management Intensive Grazing and Concentrated Animal Feeding Operations
… questions remain regarding the amount of phosphorus (P) loss from pasture-based dairies. Therefore, the goal of this study was to quantify P losses via runoff from grazing dairy systems and CAFO hay production. Four land use treatments were simulated on runoff release plots planted in two …
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Financial costs and economic tradeoffs of alternative manure management policies on dairy and dairy/poultry farms in Rockingham County, Virginia
… to agronomic recommendations (NLIMIT), and phosphorus applications limited to crop removals (PLIMIT), on representative 60, 100, and 150-cow dairy and dairy/poultry farms. Current nutrient applications are manure-based, with each farm substituting poultry litter for commercial fertilizer. …
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Simulation of conservation practice effects on water quality under current and future climate scenarios
… practices on runoff and agricultural chemical losses under current and future climate conditions, using an appropriately calibrated SWAT model.</p> <p>The results indicated calibrating SWAT at one watershed size and applying the optimized parameters to watersheds of different sizes with similar …
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Risk Analysis of Adopting Conservation Practices on a Representative Peanut-Cotton Farm in Virginia
… the costs of reducing pesticide, nitrogen, phosphorus, and sediment losses of a representative risk-neutral and risk-averse peanut-cotton farmer in Southeast Virginia. Five currently popular rotations and eight alternative conservation rotations are evaluated for the representative farm. The …
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Nitrogen Regime Influence on Nutrient and Sediment Surface Runoff During Vegetative Establishment of Bermudagrass
… every five minutes and analyzed for sediment losses, N concentrations in the nitrate and ammonium forms, and phosphorus losses as dissolved reactive P (DRP). Experimental results indicate an ability to curb N losses through surface runoff during the initial weeks of sprig establishment …
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Simulation of phosphorus transport in vegetative filter strips
… of vegetative filter strips (VFS) in removing phosphorus from surface runoff. Dissolved and particulate nutrients were treated separately due to differing transport and removal mechanisms. Nutrient transport in VFS appears to be a function of runoff rate, concentration and size distribution of …
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Nutrient release from winter cover crops exposed to freeze-thaw events
… some concerns about the potential leaching of phosphorus (P) and nitrogen (N) from cover crop biomass after cycles of freezing and thawing. These freezing events may cause ice crystals to form in and between plant cells which can, in turn, result in cell lysis and tissue damage, consequently …
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Effects of Lawn Maintenance on Nutrient Losses via Overland Flow and the Comparison of Nitrous Oxide Flux from Three Residential Landscapes A Case Study
… appealing landscapes, but can result in nutrient losses via overland flow or gaseous losses to the atmosphere (e.g. nitrous oxide - N2O). The overall objective of this study was to determine the effect of lawn management on nutrient losses from residential lawns. The specific objectives were: …