Abstract
The P index (PI) is a proposed tool for rating the potential for offsite losses of P from a field or other management unit. The eight site characteristics comprising the PI were evaluated on several best management practice (BMP) demonstration plots in the Dairy-McKay Hydrologic Unit Area (HUA) in western Oregon and on an entire subbasin in the Granger Drain HUA in eastern Washington. An estimate of site vulnerability is obtained by adding the weighted values of the site characteristics. Site vulnerability ranged from low to medium in the DairyMcKay HUA. The medium values were due to P fertilizer application rates of > 66 Ib P/acre and surface sidedress application. Site vulnerability ratings by soil type for fields in the Granger Drain HUA were concentrated in the medium and high categories [...]
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