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This article in SSSAJ

  1. Vol. 43 No. 3, p. 547-552
    Received: Aug 8, 1977
    Accepted: Dec 15, 1978

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Physical, Chemical, and Mineralogical Characteristics of Soils from Volcanic Ash in Northern Idaho: II. Phosphorus Sorption1

  1. J. P. Jones,
  2. B. B. Singh,
  3. M. A. Fosberg and
  4. A. L. Falen2



Volcanic ash soils from northern Idaho sorbed considerable amounts of P depending upon the parent material, physical, chemical, and mineralogical characteristics of the soils. Upper horizons of the soil derived from volcanic ash sorbed more P than did lower horizons which were derived from glacial sediment. The magnitude of P sorption was related to the extractable allophane content and quantity of concretions. The clay fraction adsorbed more P than the silt fraction. Sorption of P was due mainly to the presence of Al in concretions and the presence of higher amounts of amorphous materials. Iron, Al, Mn and other clay minerals contributed to the sorption capacity of the soils. Detailed roles of these factors in sorption of P by soils, clays, and concentrations are discussed.

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