Exchangeable Potassium and Clay Minerals in Selected Iowa Soil Profiles

Authors

J. J. Hanway, Iowa State University
R. L. Handy, Iowa State UniversityFollow
A. D. Scott, Iowa State University

Document Type

Research

Abstract

Exchangeable K values and X-ray diffraction patterns were obtained for soil samples from several modal profiles of nine different soil series in Iowa. Exchangeable K in "moist" subsoils was consistently low and almost always lower than in the "moist" surface soil. Drying increased exchangeable K in all the soils, but the increase due to drying varied between soil series and with depth in the profile of each series. Reversion of exchangeable K to a non-exchangeable form on rewetting the oven-dry samples generally increased with depth in the profile but the exchangeable K never decreased to the original "moist" level. X-ray diffraction analyses showed the presence of montmorillonite, chorlite, illite and/ or mica, and kaolinite in all the profiles, with mortmorillonite predominating. Vermiculite was present in some of the soil series. No relationship between the clay mineral content and the amount of exchangeable K could be established.

Publication Date

1960

Journal Title

Proceedings of the Iowa Academy of Science

Volume

67

Issue

1

First Page

215

Last Page

231

Copyright

©1960 Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

Recommended Citation

Hanway, J. J.; Handy, R. L.; and Scott, A. D. (1960) "Exchangeable Potassium and Clay Minerals in Selected Iowa Soil Profiles," Proceedings of the Iowa Academy of Science, 67(1), 215-231.
Available at: https://scholarworks.uni.edu/pias/vol67/iss1/32