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Chemical and Clay Mineralogical Properties of Certain Memphis Catena Soils of Western Kentucky¹

ABSTRACT

Chemical and clay mineralogical properties of Memphis, Grenada, Calloway and Henry series were determined and related to degree of internal drainage and genesis. Percent base saturation and other chemical data indicated that the more poorly drained profiles were more severely leached than better drained members. These data, together with the occurrence of larger proportions of expanding lattice 2:1 type minerals to nonexpanding 2:1 types in the more poorly drained profiles, suggest that a high degree of weathering was attained before pan horizon formation occurred.

The presence of lower exchangeable Ca/Mg + Na ratios along with lower montmorillonite/vermiculite ratios in B_3m horizons than in deeper or shallower horizons suggests that the pans are the result of packing of dispersed clay particles and that vermiculite has formed from montmorillonite or other weathering products in those horizons.

Contribution from Agronomy Department, University of Kentucky, Lexington. Published with permission of Director of Kentucky Agr. Exp. Sta. Appreciation is expressed to The National Science Foundation for partial support of this research.

² Associate Agronomist, formerly Graduate Assistant, and Vice-Director of the Kentucky Agr. Exp. Sta., respectively.

Received for publication May 1, 1959. Accepted for publication August 17, 1959.

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