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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: 8070-13000-012-20
Project Type: General Cooperative Agreement

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

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

Approach:
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: 10/25/2014
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