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Effect of Iron, Aluminum and Humic Acid on Phosphorus Fixation by Organic Soils¹

ABSTRACT

Studies were conducted comparing the effects of Fe, Al, and humic acid on P fixation in two organic soils which had undergone different degrees of decomposition. It was shown that organic soils fix P similarly to other reported P-fixing systems. Fe and/or Al additions increased phosphate fixation while humic acid resulted in an apparent negative absorption. Further, humic acid prevented absorption of P in the presence of limited quantities of Fe and Al.

¹ Journal Paper No. 1250. Purdue University Agr. Exp. Sta., Lafayette, Ind. Contribution of the Department of Horticulture.

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

Received for publication August 8, 1958. Accepted for publication June 29, 1959.

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