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This article in SSSAJ

  1. Vol. 43 No. 4, p. 813-815
    Received: Oct 2, 1978
    Accepted: Feb 22, 1979

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Aluminum Organic Matter in Acid Soils: Salt-Extractable Aluminum1

  1. P. R. Bloom,
  2. M. B. McBride and
  3. R. M. Weaver2



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.

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