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ARS Home » Northeast Area » University Park, Pennsylvania » Pasture Systems & Watershed Management Research » Research » Publications at this Location » Publication #172041
Title: PHOSPHORUS INDICES

Author
item Weld, Jennifer
item Sharpley, Andrew

Submitted to: Book Chapter
Publication Type: Book / Chapter
Publication Acceptance Date: 5/3/2005
Publication Date: 11/1/2006
Citation: Weld, J.L., Sharpley, A.N. 2006. Phosphorus Indices. In: Radcliffe, D.E., Cabrera, M.L., editors. Modeling Phosphorus in the Environment. Boca Raton, FL: CRC Press. P. 301-332.

Interpretive Summary: An interpretive summary is not required.

Technical Abstract: Phosphorus (P), an essential element for plant and animal production, can accelerate eutrophication, which has become one of the most ubiquitous water quality impairments in the U.S. This has forced many states to consider the development of recommendations for P applications and watershed management based on the potential for P loss in agricultural runoff. In response, a P index has been developed to rank field vulnerability to P loss so that high risk areas may be identified for site-specific management. The index accounts for and ranks transport (erosion, runoff, leaching, and landscape position) and source factors (added fertilizer and manure, soil P) controlling P loss and identifies sites where the risk of P movement is expected to be higher than others. Fields at high risk are those where areas of high P application or soil P coincide with zones of active surface runoff or erosion. A P index has been developed to rank field vulnerability to P loss so that high risk fields may be identified for site-specific management. The index provides a framework that can be regionally adapted to prevailing topography, geology, and climatic conditions and requires only readily available data.