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• W2034192718 abstract "Excess phosphorus (P) that is transported into water bodies can cause water qualityproblems. A high potential for P delivery occurs when there is a high transport potential fromerosion, runoff, and/or leaching coupled with high soil test P and/or high rate of fertilizer Papplication. Identifying those fields that have a high transport and source potential to deliver P tosurface water is the first step in reducing water quality problems due to excess P. The Virginia PIndexis a mass-based tool that estimates the annual risk of delivery of P from a given field to surfacewater. Guidelines on P application rates are based on the level of risk. Research and testing areneeded to determine the dependability and validity of this recently developed index. The overall goalof the research was to contribute to the continued development of the Virginia P-Index as aneffective P management tool.<br><br>A sensitivity analysis was completed to identify the parameters to which the P-Index was mostsensitive under a range of conditions. In low erosion and runoff conditions, the P-Index was mostsensitive to P management factors including application rate. As erosion and runoff potential increased, the P-Index was most sensitive to the erosion risk factors including soil loss. Underconditions with subsurface leaching, the P-Index was most sensitive to the subsurface leachingfactors and Mehlich I soil test P. A stochastic analysis was also conducted to determine the effectsof parameter variability as a function of input parameter variability on P-Index values and subsequentapplication recommendations. Variability of the P-Index output was greater as the risk of P deliveryincreased.<br><br>A survey was completed to determine expert opinion as to the appropriateness of parameterestimation methods used in the Virginia P-Index. Thirty-eight survey participants from within andoutside of Virginia Indicated that all factor estimation methods were appropriate, given the state ofthe science. Estimation methods for the following factors were determined to be less appropriatethan the other sub-factors by the survey respondents: soil texture/drainage class, subsurfacedissolved reactive orthophosphate (DRP), runoff delivery, and sediment delivery. Recommendationsfor improvement were identified including a need for additional analysis and studies." @default.
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• W2034192718 date "2003-01-01" @default.
• W2034192718 modified "2023-09-28" @default.
• W2034192718 title "Phosphorus Management: An Analysis of the Virginia Phosphorus Index" @default.
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• W2034192718 doi "https://doi.org/10.13031/2013.14021" @default.
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