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This article in SSSAJ

  1. Vol. 23 No. 3, p. 239-241

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Some Characteristics of Clay Skins on Peds in the B Horizon of a Gray-Brown Podzolic Soil1

  1. S. W. Buol and
  2. F. D. Hole2



Clay coatings or skins were removed from peds in the B3 horizon of a Gray-Brown Podzolic soil of southern Wisconsin. Analyses were made to determine the contents, both in the clay skins and in the entire horizon, of N, C, clay, reductant-soluble Fe, total Fe, Al, Na, K, Ca, Si, Mg, and Ti. Thin sections were made of peds from the B3 horizon and were examined with the aid of a petrographic microscope to determine the structure of the clay skins.

The results of analyses for the clay skins show relatively high contents of N (0.11%), C (1.836%), clay (87.4%), free Fe (2.76%), as compared with contents in the bulk sample from the B3 horizon: 0.029% N, 0.417% C, 24.3% clay, and 1.33% free Fe. X-ray diffraction patterns showed that the clay in the bulk sample contained slightly more chlorite and slightly less vermiculite and chlorite-vermiculite intergrade than the clay of the clay skin. Microscopic thin-sections of clay skins showed a mean clay-skin thickness of 0.079 mm., with component lamellae each 0.007 to 0.010 mm. thick.

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