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ABSTRACT
The forms of P in 24 soils were determined by chemical fractionation. The available P was determined by plant growth experiments. Regression analysis of the P fractions with available P showed that iron P explained most of the variation. Water-soluble P was the only other fraction significantly contributing to the explained variation.
1 Journal paper No. 2097. Purdue University Agr. Exp. Sta. Lafayette, Ind. Contribution from the Dept. 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.
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