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Phosphorus Management: An Analysis of the Virginia Phosphorus Index
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Paper number 032156, 2003 ASAE Annual Meeting . (doi: 10.13031/2013.14021) @2003
Authors: Julie Jesiek, Mary Leigh Wolfe
Keywords: phosphorus management, sensitivity analysis, expert opinion survey
Excess phosphorus (P) that is transported into water bodies can cause water quality
problems. A high potential for P delivery occurs when there is a high transport potential from
erosion, runoff, and/or leaching coupled with high soil test P and/or high rate of fertilizer P
application. Identifying those fields that have a high transport and source potential to deliver P to
surface water is the first step in reducing water quality problems due to excess P. The Virginia PIndex
is a mass-based tool that estimates the annual risk of delivery of P from a given field to surface
water. Guidelines on P application rates are based on the level of risk. Research and testing are
needed to determine the dependability and validity of this recently developed index. The overall goal
of the research was to contribute to the continued development of the Virginia P-Index as an
effective P management tool.