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Rock Phosphate Transformations in Acid Soils¹

ABSTRACT

A study of several Virginia soils revealed that rock phosphate breakdown into both Al- and Fe-fractions decreased with increasing pH. The relationship between pH and Al-phosphate was essentially the same for all soils studied, whereas the amount of Fe-phosphate formed varied both with pH and soil free Fe content. From these relationships it appears that soils which respond well to rock phosphate applications are those with low pH and relatively low free Fe content.

¹ A contribution from the Agronomy Department, Virginia Agr. Exp. Sta., Blacksburg. Presented before Div. IV, Soil Science Society of America, Nov. 30, 1961, at St. Louis, Mo.

² Former Graduate Assistant, Assistant Professor, and Associate Professor of Agronomy, respectively.

Received for publication November 27, 1961. Accepted for publication January 3, 1962.