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Title:   Author  item
                                            SHARPLEY, ANDREW - University Of Arkansasitem
                                            BEEGLE, DOUG - Pennsylvania State Universityitem
                                            Bolster, Carlitem
                                            GOOD, LAURA - University Of Wisconsinitem
                                            JOERN, BRAD - Purdue Universityitem
                                            KETTERINGS, QUIRINE - Cornell Universityitem
                                            LORY, JOHN - University Of Missouriitem
                                            MIKKELSEN, ROB - International Plant Nutrition Institute (IPNI)item
                                            OSMOND, DEANNA - North Carolina State Universityitem
                                            Vadas, Peter
  Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 7/1/2011
                                    Publication  Date: 10/19/2011
                                    Citation: Sharpley, A., Beegle, D., Bolster, C.H., Good, L., Joern, B., Ketterings, Q., Lory, J., Mikkelsen, R., Osmond, D., Vadas, P.A. 2011. Phosphorus indices and the 590 Revision: Why we need to take stock of how we are doing .. ASA-CSSA-SSSA Annual Meeting Abstracts. Abstract Only.Interpretive Summary:
                                Technical Abstract: Since its inception nearly 20 years ago, the phosphorus (P) Index has morphed from an educational tool to a Best Management Practice targeting and implementation tool, a manure-scheduling tool, and in many cases, a regulatory tool.  A great deal of research has been conducted across the U.S. to derive, validate, and support components of the P Indexing concept, particularly those related to source factors.  As different versions of the P Index have emerged, ostensibly to account for local topography, hydrology, soils, land use, and individual state policies and agendas, so too have differences in the P management recommendations that are made using the P Index.  As a result, there are many variations in P Indices now in use as part of the NRCS 590 Nutrient Management Conservation Standard.  This variation is both a strength and weakness of the P Indexing concept.  However, the inconsistency among P Indices in terms of level of detail and scientific underpinnings among states, as well as in recommendations and interpretations based on site risk, prompted a review and possible revision of the 590 Standard and P-Indexing approach.  The need for revision has been heightened by a slower than expected decrease in P-related water quality impairment and, in some cases, an increase in soil P to levels several fold greater than agronomic optimum due to the inability of the P Index to prevent the continued over-application of P to soils.  While the basic scientific foundations of the P-Indexing approach are sound, these concerns are real.  In this presentation, we propose the use of lower and upper boundaries of P Index use and describe an approach to evaluate individual State P Indices.


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