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A Soil Test for Phosphorus Based Upon Fractionation of Soil Phosphorus: II. Development of the Soil Test¹

ABSTRACT

The correlation of soil P fractions with P uptake by millet was used as a basis for developing a soil test. The soil test consists of shaking 1 g. of soil with 20 ml. of solution made up from 17 ml. of 0.3N NaOH and 3 ml. of 0.5N Na₂C₂O₄. The shaking time had little effect on the amount extracted. The soil test works particularly well on soils of pH above 7.

¹ Journal Paper No. 2096. Purdue University Agr. Exp. Sta., Lafayette, Ind. Contribution from the Department of Agronomy.

² Former Graduate Assistant and Professor of Agronomy respectively, Purdue University.

Received for publication April 15, 1963. Accepted for publication August 19, 1963.