Development and Validation of a Quantitative Phosphorus Loss Assessment Tool

Development and Validation of a Quantitative Phosphorus Loss Assessment Tool

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Conservation planners need an assessment tool to accurately predict phosphorus loss from agricultural lands to evaluate the impact of management decisions on water quality. Available tools to predict phosphorus loss were either qualitative indices with limited capability to quantify offsite water quality impacts or quantitative process based models which were prohibitively complex for most conservation planners. To address the need for a simple quantitative tool, PPM Plus was developed. PPM Plus is a vastly simplified interface for the Soil and Water Assessment Tool (SWAT) model, a powerful comprehensive hydrologic and water quality model which can predict the average annual phosphorus and sediment losses. It is simple enough for use by farmers and conservation planners, supports both cultivated crops and pastures, and can applied throughout the state of Oklahoma. PPM Plus can make predictions using a wide variety of management options and Best Management Practices (BMPs). It can be used to predict site specific impacts of many BMPs prior to implementation and aid in the evaluation of state and federally sponsored BMP implementation projects. When combined with numeric water quality standards, it can be used to predict allowable animal manure or commercial fertilizer application by field to ensure that water quality standards are met. A detailed sensitivity analysis and extensive validation was conducted on PPM Plus. The validation used 283 years of field scale data collected under natural rainfall throughout Oklahoma and the southern United States. These extremely diverse data included pasture, small grains, and row crop fields with rainfall ranging from 630 to 1390 mm/yr, with and without manure application. The validation included average annual runoff, total and soluble phosphorus, and sediment. PPM Plus explained 68% of the variability in measured total phosphorus losses. This tool performed extremely well compared to other field scale phosphorus assessment tools. PPM Plus puts the predictive power of one of the best hydrologic water quality models into the hands of people who make daily farm management decisions which impact water quality.... Transactions of the ASAE, 39(5): 1689-1696. Edwards, D. R., Haan C.T., Sharpley A. N., Daniel T. C., Murdoch J. F., Moore P. A. 1996b. ... Soil and Water Assessment Tool Usera#39;s Manual Version 2000. Blackland Research Center. Rollins, D.


Title:Development and Validation of a Quantitative Phosphorus Loss Assessment Tool
Author: Michael James White
Publisher:ProQuest - 2007
ISBN-13:

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