Manure now supplies more P to West Virginia crops than does inorganic fertilizer. Increases in land application of animal wastes have the potential to greatly impact surface water quality, particularly in sensitive watersheds like the Chesapeake Bay. It is necessary to be able to extrapolate intensive field and laboratory data on soil P adsorption capacity to broader landscapes to facilitate more extensive land use and management decision making. The objective of this study is to use previously collected data on West Virginia soils to develop county-wide and state-wide maps of phosphorus adsorption capacity. Characterization data were collected on 100 pedons from 31 soil series (including 57 pedons from 17 benchmark soils) throughout the agriculturally important regions of WV. Maximum P adsorption and P saturation capacity were also determined. A GIS-based spatial analysis of this previously collected soil characterization and phosphorus sorption data was used to generate county-wide and state-wide maps of P sorption capacity using SSURGO data.
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