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Aluminum Organic Matter in Acid Soils: Salt-Extractable Aluminum¹

ABSTRACT

Sample horizons of an acid Inceptisol from New York, an Oxisol from Brazil, and an aluminum-peat complex containing 1 mole of Al per mole of peat carboxyl groups were extracted with 1N KCl and 1N LaCl₃. For all three materials, LaCl₃ extracted significantly more Al. The quantity of Al extracted expressed as a fraction of the BaCl₂-TEA acidity was greater for the peat than the soils. It was concluded that the fraction of Al bound by organic matter is important in determining the quantity of Al extracted from surface soils by neutral salts and that "exchangeable aluminum" and "effective cation exchange capacity" are defined by the cation and concentration of the extracting salt.

¹ Contribution of the Dep. of Agronomy, Cornell Univ., Ithaca, NY 14853, Agronomy Paper no. 1262. This work was partially supported by AID-tac-1104.

² Former Graduate Research Assistant, presently Assistant Professor of Soil Science, Univ. of Minnesota, St. Paul, MN 55108; Assistant Professor of Soil Science, Cornell Univ.; and Group Leader, Research, J. M. Huber Co., Huber, GA 31040, respectively.

Received for publication October 2, 1978. Accepted for publication February 22, 1979.

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