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Fig. 2. Scoring functions for soil test P, showing differences based solely on slope: for sites with 0–2% slopes, for 4–8% slopes, and >16% slopes. Other assumptions made to generate this example were: P was determined using Mehlich III, soils were planted to fescue, and inherent soil characteristics include medium high organic matter (approximately 3.5–5% total organic C), silt or silt loam texture, and only slight weathering. In this example, the inflection points for the ascending portion of the curve depend on primarily crop requirements while the descending portion inflection points are largely dictated by slope.
