206 Symposium--Evaluation and Validation of Phosphorus Indices: Part I

Oral Session
ASA Section: Environmental Quality The P-index concept is widely used to evaluate the risk of P loss from agricultural fields. Because there are nearly 50 permutations of P-indices in use, scientists and federal agencies have requested that all P indices be evaluated to determine if they are directionally and magnetically correct when compared with independently quantified P losses. The goal of the symposium is to highlight the results of P-index evaluations and encourage further quantitative evaluation and improved interpretation of P-indices. Presentations could include comparison of P-Indices with field and modeled data, P-index rankings relative to farm and watershed P imbalances, uniformity of P-index interpretation, and integration of P-indices in GIS frameworks.


Environmental Quality
Nutrient Loss Assessment and Prevention
Tuesday, October 18, 2011: 9:00 AM-11:45 AM
Henry Gonzalez Convention Center, Room 217A

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Nathan Nelson and Amy Shober
Amy Shober and Nathan Nelson
9:05 AM
Phosphorus Indices and the 590 Revision: Why We Need to Take Stock of How We Are Doing.
Andrew Sharpley, University of Arkansas; Douglas Beegle, The Pennsylvania State University; Carl Bolster, USDA-ARS; Laura Good, UW Madison; Brad Joern, Purdue University; Quirine Ketterings, Cornell University; John Lory, University of Missouri; Robert Mikkelsen, International Plant Nutrition Institute; Deanna Osmond, Dept. of Soil Science/North Carolina State University; Peter Vadas, USDA-ARS
9:15 AM
Constructing a Revised Maryland Delaware Phosphorus Site Index: Lessons Learned.
Joshua McGrath, University of Maryland; Frank Coale, University of Maryland; James Thomas Sims, Department of Plant and Soil, University of Delaware
9:35 AM
P Index As a P Awareness Tool: Documented P Use Reductions In NYS.
Quirine M. Ketterings, Cornell University; Karl J. Czymmek, Cornell University
10:15 AM
10:25 AM
Using A P Loss Model to Evaluate and Improve P Indices.
Carl Bolster, USDA-ARS; Peter Vadas, USDA-ARS; Andrew Sharpley, University of Arkansas; John Lory, University of Missouri
10:45 AM
Predicting Edge of Field Phosphorus Loss Using Models: Recent Results and Developments.
Michael White, Grassland Soil and Water Research Laboratory; Robert Harmel, Grassland Soil and Water Research Laboratory
11:25 AM
Comparing Southern P Indices to Runoff Data.
Deanna Osmond, Dept. of Soil Science/North Carolina State University; Miguel Cabrera, University of Georgia; Charles Mitchell, Auburn University; Philip A. Moore Jr., USDA-ARS; Rao Mylavarapu, University of Florida; Larry Oldham, Mississippi State University; Andrew Sharpley, University of Arkansas; Forbes Walker, University of Tennessee; Hailin Zhang, Oklahoma State University
11:45 AM