The Lower Boundary of Selected Mollisols

Douglas Jr, C.L. and Fehrenbacker, J.B. and Ray, B.W. (1967) The Lower Boundary of Selected Mollisols. Soil Science Society of America Proceedings. 31(6):795-800.

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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 Alms, 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.

Item Type:	Article
NWISRL Publication Number:	0089
Subjects:	Mass Import - unclassified
Depositing User:	Dan Stieneke
Date Deposited:	20 Nov 2010 21:54
Last Modified:	15 Mar 2017 22:09
Item ID:	657
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/657