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Abstract
The ratio of nutrient concentrations in two soil extracts: 1) H2O, and 2) NH4OAc (0.5M) + AcOH (0.5M) + EDTA (0.02M) at pH:4.65, representative of mobile (m) and mobilizable (M) fractions are proportional to soil apparent retention R, where R = (M/m). If the purpose of fertilization is to assure an optimum mobile concentration through adjustment of the mobilizable concentration, then normalizing M and m with respect to reference field values give:
Calculations with R as deduced from two extracts reduces leachable excesses for soils with low retention and non‐mobilizable pool build‐up in cases of high retention.