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Fluorine Distribution with Depth in Relation to Profile Development in Illinois¹

ABSTRACT

Fluorine content increases with depth, evidently in response to pH-related absorption of F that has weathered from minerals in all size fractions of the upper solum. This relationship with soil colloids creates depth distribution characteristics of F that closely follow soil development trends that are especially well expressed by clay content. Fluorine attributed to organic matter in A and B horizons amounted to 9 µg/g of organic matter.

¹ Contribution of the Dep. of Agronomy, University of Illinois, Urbana, IL 61801. Taken from part of a dissertation submitted by J. A. I. Omueti to the Graduate College.

² Former Graduate Student, presently Lecturer, Dep. of Agronomy, University of Ibadan, Nigeria; and Professor of Soil Mineralogy and Ecology, respectively, University of Illinois, Urbana.

Received for publication March 19, 1979. Accepted for publication September 26, 1979.