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

ABSTRACT

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.

¹ Contribution from the Dept. of Plant and Soil Sciences, University of Idaho, Moscow, ID 83843. Approved for publication by the Director of the Idaho Agric. Exp. Stn. as Research Paper no. 7779.

² Professor of Soils, Former Postdoctoral Research Assistant, Professor of Soils, and Scientific Aide, respectively, Department of Plant & Soil Sciences, Univ. of Idaho, Moscow, ID 83843.

Received for publication August 8, 1977. Accepted for publication December 15, 1978.