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United States Department of Agriculture

Agricultural Research Service

Research Project: Refining State Phosphorus (P) Indices to Comply with NRCS National Nutrient Management Policy and Guidance

Location: Pasture Systems & Watershed Management Research

Project Number: 1902-13000-012-20
Project Type: General Cooperative Agreement

Start Date: May 01, 2012
End Date: Apr 30, 2013

This project will establish new techniques for validating site assessment indices used in nutrient management using measured and modeled data.

The general approach will be to conduct computer simulation modeling in select watersheds to compare edge-of-field phosphorus (P) loss estimates with SWAT (Soil Water Assessment Tool) with predictions of phosphorus loss potential with the P Index. Up to four watersheds (WE-38, PA; St. Joe’s, IN; Riesel, TX; Goodwater Creek, MO) will be included. At each watershed, historical monitoring data will be used to calibrate SWAT so that the model accurately represents local processes controlling P loss at field and watershed scales. Where necessary, activities will include measuring and analyzing P transport under different management systems and across a range of conditions. Activities will involve coordination with Lee Norfleet of NRCS, Doug Smith of ARS, Daren Harmel of ARS, and Andrew Sharpley of University of Arkansas (coordinating SERA-17 590 Standard Task Force).

Last Modified: 7/22/2014
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