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Exchangeable Aluminum As a Criterion for Liming Leached Mineral Soils¹

ABSTRACT

Lime rates equivalent to the amount of exchangeable Al reacted primarily with the exchangeable Al and reduced the Al saturation of the effective CEC to less than 30%. Lime rates greater than the equivalent amount of exchangeable Al resulted in appreciable amounts of nonexcharigeable acidity being neutralized. Below pH 5.4 the buffer capacity of the soils was primarily due to exchangeable Al. Lime applications based on the exchangeable Al extracted with a neutral unbuffered salt appear to be a realistic approach for Ultisols and Oxisols.

¹ Paper no. 2935 of the Journal Series of the North Carolina State Univ. Agr. Exp. Sta., Raleigh, N.C.

² Professor, Department of Soil Science.

Received for publication August 5, 1969. Accepted for publication October 21, 1969.