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Studies on the Leaching of Applied Labeled Phosphorus in Organic Soils¹

ABSTRACT

Studies were conducted on the leaching of applied labeled phosphate in 5 organic soils and 1 mineral soil. After 15 inches of water were leached through the soil columns, phosphate retention appeared closely correlated to the sesquioxide content of the soils and the apparent degree of decomposition. When labeled phosphate was mixed into the surface 2 inches of a 14-inch column of a virgin organic soil, 60 and 80% appeared in the leachate from 15 and 30 inches of water, respectively. Lesser amounts of phosphorus appeared in the leachate from soils with greater sesquioxide contents and with longer drainage histories, while no fertilizer phosphate was leached from the mineral soil or from the organic soil which had been drained 15 or more years.

¹ Journal Paper No. 1200. Purdue University, Agr. Exp. Sta., Lafayette, Ind.

² Graduate Student, Assistant Professor, and Professor of Horticulture, respectively. Senior author is now Horticulturist, J. W. Davis Co., Terre Haute, Ind.

Received for publication December 19, 1957. Accepted for publication August 19, 1958.