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Nature of Phosphorus Retention and Adsorption with Depth in Soil Columns¹

ABSTRACT

Sequential fractionation of adsorbed ³²P and changes in equilibrium P concentration (EPC) with depth were studied in a column leaching experiment. In general, the percentage of NH₄Cl-extractable P decreased rapidly with depth; the percentage of NH₄F-extractable P decreased rapidly in the initial 2-cm depth and then remained fairly constant. Percentage NaOH-extractable P increased as that of NH₄F-extractable P decreased, and that of H₂SO₄-extractable P increased gradually with depth.

Equilibrium P concentration (EPC) decreased with depth and increased as rate of P applied increased. These EPC values reflected both depth of penetration of applied P and level of native P in the soil.

¹ Contribution from the Ohio Agr. Res. and Dev. Center as Journal Article 20–72, published with the permission of the Director. Presented before Div. S-2 Soil Science Society of America. New York, N.Y., August 19, 1971. This work was supported by a grant from the Office of Water Resources, Ohio State Univ. Data in this paper are from the Ph.D. Dissertation of the senior author, Ohio State University, 1971.

² Former graduate student now Assistant Professor, and Professor, The Ohio State Univ., and the Ohio Agr. Res. and Dev. Center, respectively.

Received for publication September 18, 1972. Accepted for publication January 26, 1973.