The reactive Al pool in selected Ultisols, Oxisols, and Histosols from Africa, South America, and North Carolina was estimated by extraction with 1 N CuCl 2 . The Al‐saturated clay minerals with and without interlayered hydroxy‐Al were used to compare the extractability of Al by 1 N CuCl 2 and 1 N KCl. The 1 N solutions of KCl and CuCl 2 were equally effective in extracting exchangeable Al from an Al saturated montmorillonite. The 1 N CuCl 2 solution, however, extracted almost twice as much Al from an Al saturated vermiculite containing a hydroxy Al interlayer as compared with 1 N KCl. Generally, more than twice as much Al was extracted from acid surface soils (< pH 5) by 1 N CuCl 2 than by 1 N KCl suggesting that Al bound by organic matter was being extracted by the CuCl 2 .
No takes yet. Share an insight, caveat, or question.
Juo et al. (1979) studied this question.