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Use of Isotopic Dilution in a Study of Inorganic Phosphorus Fractions from Different Soils¹

ABSTRACT

The study consisted of a factorial experiment in which each of seven widely different soils was treated with 0 and 1 lime requirements and 0, 500, and 1,000 ppm of P. Prior to fractionating the soil P, a constant amount of P³² was added to each sample. The results indicate that for these acid soils, P was extracted predominantly with the aluminum phosphate and iron phosphate fractions. Results for isotopic dilution indicated that the different P fractions ranked in the following order with respect to amounts of active solid phase P removed per unit of solid phase P: water soluble P > aluminum phosphate > iron phosphate > calcium phosphate. The rapidity with which P³² reached an equilibrium with P extracted from soils with NH₄F (aluminum phosphate) indicates why fluoride-extractable P has correlated highly with availability of soil P.

¹ Contribution of the Pennsylvania Agr. Exp. Sta., University Park, Pa. Authorized for publication on Sept. 11, 1964 as paper No. 2934 of the journal series.

² Graduate student and Assistant Professor of Soil Technology, respectively, The Pennsylvania State University.

Received for publication October 5, 1964. Accepted for publication December 28, 1964.