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Title:   Author  item
                                            OSMOND, DEANNA - North Carolina State Universityitem
                                            Bolster, Carlitem
                                            CABRERA, MIGUEL - University Of Georgiaitem
                                            FEAGLEY, SAM - Texas A&M Universityitem
                                            FORSBERG, ADAM - University Of Georgiaitem
                                            MITCHELL, CHARLES - Auburn Universityitem
                                            MITTELSTET, AARON - Oklahoma State Universityitem
                                            MYLAVARAPU, RAO - University Of Floridaitem
                                            OLDHAM, LARRY - Mississippi State Universityitem
                                            RADCLIFFE, DAVID - University Of Georgiaitem
                                            RAMIREZ-AVILA, JOHN - Mississippi State Universityitem
                                            SHARPLEY, ANDREW - University Of Arkansasitem
                                            STORM, DAN - Oklahoma State Universityitem
                                            WALKER, FORBES - University Of Tennesseeitem
                                            ZHANG, HAILIN - Oklahoma State University
  Submitted to: Soil and Water Conservation Society Proceedings
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 2/9/2016
                                    Publication  Date: 8/17/2016
                                    Citation: Osmond, D., Bolster, C.H., Cabrera, M., Feagley, S., Forsberg, A., Mitchell, C., Mittelstet, A., Mylavarapu, R., Oldham, L., Radcliffe, D., Ramirez-Avila, J., Sharpley, A., Storm, D., Walker, F., Zhang, H. 2016. Southern P indices, water quality data, and modeling results: a comparison. Soil and Water Conservation Society Proceedings. 107.Interpretive Summary:
                                Technical Abstract: Phosphorus (P) indices in the south frequently produce different results for similar conditions.  After collecting data from benchmark sites throughout the south (6 Arkansas, 1 Georgia, 2 Mississippi, 4 North Carolina, 4 Oklahoma, and 4 Texas site/treatment water quality and land treatment data sets), we compared predictions of each state P-Index assessment tool to water quality data derived from the benchmark sites using RUSLE 2 erosion data as well as actual sediment losses. We also compared predictions of southern (Alabama, Arkansas, Florida, Georgia, Kentucky, Louisiana, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, and Texas) P-index assessment tools against calibrated fate and transport water quality models (APEX, TBET, and APLE).  We then compared P indices to each other for each data set.  Comparisons of the different information sources show dissimilarities between P indices but also water quality data and modeling results. Finally, it is unclear how to assign losses and potential risk since water resources have different sensitivities to phosphorus and typically this is not standardized in P-index loss ratings, including the national nutrient management standard (590 USDA-Natural Resource Conservation Service).


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