SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 31:795-800 (1967)
© 1967 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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The Lower Boundary of Selected Mollisols1

C. L. Douglas, Jr., J. B. Fehrenbacher and B. W. Ray2

ABSTRACT

Thicknesses of three Mollisols (Tama, Elburn, and Drummer series), developed from Wisconsinan-age material in a toposequence in Central Illinois, were considerably greater (18 to 68 cm) when their lower boundaries were determined by the depth of rooting of native perennial big bluestem (Andropogon gerardi) than when determined by the lower limit of the solum. A combination of four criteria—structural development, significant clay accumulation, significant clay films, and the presence of completely unleached material—probably gave the best measure of solum thickness of these soils. However, evidence of some clay movement below the solums and the greater depth of rooting of native perennial grass, and also of such crops as corn (zea mays L.), suggests that material beneath the solum is important in the behavior, definition, and classification of many of these kinds of soils in the north-central region of the U.S.

NOTES

1 Contribution from Dep. of Agron., Illinois Agr. Exp. Sta., Urbana. Published with the approval of the Director of the Illinois Agr. Exp. Sta.

2 Formerly Graduate Assistant, Univ. of Illinois, now Soil Scientist, USDA, Snake River Conserv. Res. Center, Kimberly, Idaho; Professor and Assistant Professor, respectively, Univ. of Illinois.

Received for publication April 28, 1967. Accepted for publication June 19, 1967.






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