208 Symposium--Evaluation and Validation of Phosphorus Indices: Part II

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: 1:00 PM-3:00 PM
Henry Gonzalez Convention Center, Room 217A

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Nathan Nelson and Amy Shober
Nathan Nelson and Amy Shober
1:05 PM
Accounting for the Risks of P Losses Through Tile Drains In a P Index.
D. Keith Reid, AAFC; Bonnie Ball-Coelho, Ontario Ministry of Agriculture, Food and Rural Affairs
1:20 PM
Stream Phosphorus and Nitrogen Trends In a Watershed Under a Court Mandated Index.
Brian E. Haggard, University of Arkansas; Andrew Sharpley, University of Arkansas; Thad Scott, University of Arkansas; Joshua Romeis, University of Arkansas
1:35 PM
Validation of the Arkansas Phosphorus Index.
Philip A. Moore Jr., USDA/ARS
1:50 PM
Field Evaluation of the Texas Phosphorus Index.
Hugh Atwell, Texas A&M University; Sam Feagley, Texas A&M University
2:05 PM
2:15 PM
Direct and Indirect Assessment of Pennsylvania and Arkansas Phosphorus Indices.
Andrew Sharpley, University of Arkansas; Anthony Buda, USDA-ARS-PSWMRU; Peter Kleinman, USDA-ARS; Sheri Herron, BMPs Inc.
2:30 PM
Evaluation of the Kansas P-Index with CEAP National Assessment Data.
Megan Brown, Kansas State University; Nathan Nelson, Kansas State University; M. Lee Norfleet, USDA-NRCS; Jay Atwood, USDA-NRCS; Jerrell Lemunyon, USDA-NRCS; Jeff Goebel, USDA NRCS
2:45 PM
Integrating Management Into the Georgia P-Index.
Dorcas H. Franklin, USDA, ARS; Miguel Cabrera, Univeristy of Georgia; David Butler, University of Tennessee; Julia Gaskin, University of Georgia; Larry West, USDA/NRCS; Larry M. Risse, Univeristy of Georgia
3:00 PM