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Fragipan Soils of Illinois: III. Micromorphological Studies of Hosmer Silt Loam¹

ABSTRACT

Micromorphological studies of Hosmer silt loam, a bisequal soil with a fragipan, indicate that the B₂ horizon of the upper sequum is at present an apparently stable, non-illuvial horizon, whereas the B horizons of the lower sequum are apparently illuvial in character, and in the process of degradation to form the encroaching A'₂ horizon. An attempt is made to relate resistance to rupture of the major horizons to their micromorphology.

¹ Contribution from the Department of Agronomy, Illinois Agr. Exp. Sta., Urbana. Published with the approval of the Director of the Illinois Agr. Exp. Sta. Presented before Div. V. Soil Science Society of America, Atlanta, Ga., Nov. 20, 1957.

² Graduate Assistant; Petrographer, Rothamsted Exp. Sta., Harpenden, Herts, England; Assistant Professor; and Assistant Professor, respectively. Senior author is now Soil Scientist, Soil Conservation Service, USDA, Beltsville, Md.

Received for publication April 11, 1958. Accepted for publication August 14, 1958.