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The Fate of Applied Phosphorus in Four Ohio Soils¹

ABSTRACT

Four acid soils were selected on the basis of the level of available P and the magnitude of P fixing capacity (ability to retain soluble P against Bray P₁ extracting solution). Water-soluble P labeled with P³² was applied at the rate of 3.4, 29.2, and 106 pp2m. parts of soil with and without additions of lime. The availability of the soil P to oats in the greenhouse was computed by the methods of Fried and Dean (also Larsen and Sokolov) and of Murdock and Engelbert. Fractionation of the phosphate compounds formed in the soil was also made by the method of Chang and Jackson.

Both the initial level of available P and the P fixing capacity were found to be important in determining the amount of plant response to applied P. A value indexes of available P generally increased with rate of application of P and lime. The application of soluble P to soils high in P fixing capacity decreased the availability (Bray P₁ extractability) of the native P, while the added P tended to increase the availability of the native P in the low fixing soils. Almost all of the applied P was recovered in the Al and Fe phosphate components. There was a tendency for recovery of more than half of the applied P as FePO₄ in the soils of high P fixing capacity and more than half as AlPO₄ in those of low fixing capacity.

¹ Published with the permission of the Director of the Ohio Agr. Exp. Sta. as Journal Article No. 16–62. Presented before Div. IV Soil Science Society of America, St. Louis, Mo., Nov. 30, 1961. The results were used by the senior author in partial fulfillment of the requirements for the M.S. degree. The Ohio State University, 1961. Financial assistance from the Campbell Soup Company, Camden, N. J., and The International Minerals and Chemical Corp., Skokie, Ill., is gratefully acknowledged.

² Former Graduate Fellow and Professor, respectively, The Ohio State University and the Ohio Agr. Exp. Sta.

Received for publication February 23, 1962. Accepted for publication May 21, 1962.