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Aspects of Catenary and Depth Distribution of Opal Phytoliths in Illinois Soils¹

ABSTRACT

Soil opal phytolith content is intimately related to internal soil drainage; highest opal contents occur in the middle of the drainage sequence. Soil productivity is invoked to explain the catenary opal distribution. Phytoliths are concentrated in the surface horizon of Planosols but distributed downward to 20 inches in Brunizem and Gray-Brown Podzolic soils. Differences in chemical and catenary milieu, soil fauna, or loess depositional pattern are possible causes for depth distribution differences.

¹ Approved for publication by the Director, Illinois Agr. Exp. Sta.

² Research Associate and Professor of Soil Mineralogy, Dept. of Agronomy, Univ. of Illinois, Urbana. Work reported here was supported by funds from the National Science Foundation (G16020).

Received for publication August 26, 1963. Accepted for publication December 23, 1963.