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

ABSTRACT

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.

Contribution from the Soil Survey Division, Wis. Geological and Natural History Survey and the Soils Department, University of Wisconsin, Madison. Published with the permission of the Director of the Wisconsin Agr. Exp. Sta. This work was supported in part by the Research Committee of the Graduate School with funds from the Wisconsin Alumni Research Foundation.

² Research Assistant and Associate Professor of Soils, respectively, Soils Dept., U. of Wis.