Abstract
There is renewed interest in reducing surface water quality problems associated with excessive P concentrations. A P site index has been proposed that qualitatively ranks sites based on their potential for off-site P movement. Soil test P is one of eight site characteristics used in calculating the current P site index. The purpose of this paper is to review the literature on crop, soil, and management factors which may be used as indirect measures of soil test P. Crop, soil, and management factors can influence soil test P in a variety of ways. It is quite probable that anticipated crop P removal at a particular site would reflect soil P test, and an extensive table was developed outlining P removal for numerous crops. Crops or crop rotations using relatively high P inputs will have higher soil P tests [...]
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