Abstract
The remaining phosphorus (P(subscript rem)), P concentration that remains in solution after shaking soil with 0.01mol L^(-1) CaCl2 containing 60μg mL^(-1) P, is a very useful index for studies related to the chemistry of variable charge soils. Although the P(subscript rem) determination is a simple procedure, the possibility of estimating accurate values of this index from easily and/or routinely determined soil properties can be very useful for practical purposes. The present research evaluated the P(subscript rem) estimation through multiple regression analysis in which routinely determined soil chemical data, soil clay content and soil pH measured in 1mol L^(-1) NaF (pH(subscript NaF)) figured as P(subscript rem) predictor variables. The P(subscript rem) can be estimated with acceptable accuracy using the above-mentioned approach, and pH(subscript NaF) not only substitutes for clay content as a predictor variable but also confers more accuracy to the P(subscript rem) estimates.
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