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A Modified Chang and Jackson Procedure for Routine Fractionation of Inorganic Soil Phosphates¹

ABSTRACT

A method is described for the routine fractionation of inorganic soil phosphates. Use of constant suction pipettes, two molybdophosphoric reductants with different sensitivities, and an isobutyl alcohol extraction for the determination of reductant soluble phosphates greatly increased the speed of the phosphorus determinations. Results from 100 deplicated soil samples had average coefficients of variation and correlation between duplicates within samples for the four phosphate fractions of 3.7% and 0.998, respectively.

¹ Contribution from the Soils Department, University of Wisconsin, Madison. Supported in part by a grant from the University Research Committee through the Wisconsin Alumni Research Foundation.

² Former Graduate Assistant, presently Assistant Professor of Soil Technology, The Pennsylvania State University and Professor of Soils, respectively.

Received for publication February 7, 1966. Accepted for publication June 7, 1966.