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Some Characteristics of Clay Skins on Peds in the B Horizon of a Gray‐Brown Podzolic Soil
Author(s) -
Buol S. W.,
Hole F. D.
Publication year - 1959
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1959.03615995002300030025x
Subject(s) - vermiculite , clay minerals , chlorite , clay soil , mineralogy , horizon , chemistry , geology , materials science , soil water , composite material , soil science , mathematics , quartz , geometry
Abstract Clay coatings or skins were removed from peds in the B 3 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 B 3 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 B 3 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.