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Document Type

Research

Abstract

Many soils have clay-enriched horizons that are thought to result from pedogenic processes. Various hypotheses are proposed for expected clay size-distributions in soil profiles. The average size of clay crystallites determined by the amount of broadening of x-ray diffraction peaks ranged from 160 to >2000Aº , but the lack of trends in four loess-derived soils did not permit the hypotheses to be evaluated. An unexpected relationship in a well expressed illuvial horizon was noted: as the percent of accumulated clay increased to the observed maximum the average crystallite size also increased rather than decreased as proposed. This suggests that small-sized illuvial clay particles undergo reorganization to form larger stable crystallites. Knowledge of clay crystallite size is expected to supplement other data in interpreting soil genesis.

Publication Date

1967

Journal Title

Proceedings of the Iowa Academy of Science

Volume

74

Issue

1

First Page

122

Last Page

129

Copyright

© Copyright 1967 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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