The objective of this study was to compare extractabilities of Al from Al‐treated peats using KCl, CuCl 2 , and HCl to the total Al content determined after dry ashing. Results showed that Al extracted by CuCl 2 or HCl correlated well with the total amount of Al present in the system. On the other hand, 1 N KCl extracted less than 50% of the total Al. The amount of Al extracted by CuCl 2 from peat‐Al‐clay mixtures was the same regardless of organic matter content, but KCl‐extractable Al was decreased by the addition of organic matter. Apparently some inorganic Al from clay interlayers was also extracted by CuCl 2 . Extraction of two field samples of Maury silt loam with different organic matter content showed that 1 N CuCl 2 could be used to estimate the amount of Al held by organic matter.
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Hargrove et al. (1981) studied this question.
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