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This article in SSSAJ

  1. Vol. 41 No. 6, p. 1151-1154
    Received: May 16, 1977
    Accepted: July 20, 1977

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Characteristics of Silica Sorption and Solubility as Parameters to Evaluate the Surface Properties of Tropical Soils: II. The Index of Silica Saturation1

  1. A. J. Herbillon,
  2. A. Gallez and
  3. A. S. R. Juo2



Silica solubility of some Alfisols and Ultisols from southern Nigeria was studied. The concentration in soluble silica obtained after a 3-day contact with a NaCl solution appears to be controlled by the most soluble silicate mineral present in the clay fraction. The index of silica saturation (ISS) is defined as the ratio of the amount of silica soluble in the NaCl extract and the index of silica reactivity of a given sample. ISS appears as a parameter which can be used to describe the surface properties resulting from the processes of silication and desilication taking place within the pedons and along the slopes in toposequences. In this study, ISS ranges from 9 × 10−4 to 685 × 10−4. The interest of ISS as a criterion for soil taxonomy is discussed.

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