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Identification of Reaction Products from Phosphate Fertilizers in Soils¹

ABSTRACT

Approximately 30 crystalline phosphate compounds, in addition to colloidal precipitates of variable composition, were identified as reaction products following the addition of various fertilizer solutions to soils and soil constitutents. The identifications were made by means of X-ray, petrographic, and chemical analyses. The findings help to clarify the mechanism of phosphate reactions in soils, which includes the dissolution of fertilizer and soil constituents and the precipitation of new products.

¹ Contribution from the Soils and Fertilizer Research and Fundamental Research Branches, Office of Agricultural and Chemical Development, TVA, Wilson Dam, Ala. Presented before Div. II, Soil Science Society of America, Chicago, Ill., Dec. 8, 1960.

² Research Chemist (Soils), Research Chemist, and Analytical Chemist, respectively. The senior author is now Associate Professor of Agronomy, Colorado State University, Fort Collins. Appreciation is extended to J. P. Smith of the Fundamental Research Branch, for X-ray analyses and interpretations.

Received for publication November 17, 1961. Accepted for publication February 28, 1962.