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Published in Soil Sci Soc Am J 19:351-354 (1955)
© 1955 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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A Chemical and Mineralogical Study of Clay Materials from Several Gray-Brown Podzolic Soils of Minnesota1

A. C. Caldwell, R. S. Farnham and F. L. Hammers2

ABSTRACT

Soil samples were collected from two Fayette soils developed from Peorian loess, one Milaca formed from non-calcareous glacial till of Cary substage of the Wisconsin, and one Hayden soil developed from calcareous glacial till of Mankato substage of the Wisconsin. Morphological observations placed these soils in the Gray-Brown Podzolic group. Mechanical analysis showed these soils to be silt loams. Some accumulation of clay in the B2 horizon substantiated field observations of some podzolization having occurred.

The clay material less than 0.5µ in size was separated from the A1, A2, B1, B2, and C horizons of these profiles. Total chemical analysis of the clay fraction showed little differentiation in content of inorganic constituents within and between profiles. X-ray diffraction and differential thermal analysis of some of the clays indicated clay minerals largely of the montmorillonitic type. Relatively high total exchange capacities of the clays were indicative also of montmorillonitic types of clay minerals.

NOTES

1 Paper No. 3271 of the Scientific Journal Series, Minnesota Agr. Exp. Sta. This study was supported in part by funds from the Graduate School, University of Minnesota. Presented before Div. V, Soil Science Society of America, St. Paul, Minn., Nov. 11, 1954.

2 Associate Professor, Research Fellow, and Junior Scientist in Soils, University of Minnesota, respectively.

Received for publication October 12, 1954.




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