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Published in Soil Sci Soc Am J 23:70-73 (1959)
© 1959 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Fragipan Soils of Illinois: II. Mineralogy in Reference to Parent Material Uniformity of Hosmer Silt Loam1

R. B. Grossman, I. Stephen, J. B. Fehrenbacher, A. H. Beavers and J. M. Parker2

ABSTRACT

The mineralogy of Hosmer silt loam, a bisequal soil with a fragipan, was investigated in order to determine whether there is a lithological discontinuity between the parent material of the upper and lower sequum.

Differences observed between the two sequa in respect to the mineralogy of the heavy and light, silt-size fractions may be accounted for by a progressive decrease in the weathering intensity with depth and are not suggestive of a lithological discontinuity in parent material. The clay mineralogy for the B horizons of the two sequa was similar for the < 0.2µ and the 0.2µ to 2.0µ fractions, taken individually. However, for the total clay fraction, a higher percent of montmorillonite was found in the B'2 horizon of the lower sequum; this may be explained on the basis of illuviation.

NOTES

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; Assistant Professor; and Junior Laboratory Attendant, 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.






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