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Published in Soil Sci Soc Am J 36:171-173 (1972)
© 1972 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Distribution of Concretions from Selected Soils of the Inner Bluegrass Region of Kentucky1

W. R. Phillippe, R. L. Blevins, R. I. Barnhisel and H. H. Bailey2

ABSTRACT

Total iron and manganese was determined on concretions and soil samples by X-ray emission. Soils studied included Maury, Mercer, and Lawrence, which are well-drained, moderately well-drained and somewhat poorly-drained, respectively. Iron-Manganese concretions were observed in all horizons, with a maximum of 46% by weight in a Maury C horizon. The Fe/Mn ratios decreased with increasing concretion size. This decrease was largely due to increased Mn content associated with the larger size concretions. Further analyses for composition showed that quartz and clay minerals (vermiculite, montmorillonite, kaolinite, and mica) account for most of the remaining fractions. Traces of titanium and phosphorus were also found. Microscopic studies of the concretions indicated two types of internal fabric; (i) undifferentiated (structureless), and (ii) differentiated or concentric structure. Concretions from the somewhat poorly drained soils are characterized by undifferentiated fabric and diffuse external boundaries. In contrast the concretions from the well-drained soils are usually spherical, with sharp external boundaries and differentiated fabric.

NOTES

1 Contribution from the Dep. of Agronomy, Univ. of Kentucky, Lexington. The research reported in this paper (no. 70-3-106) is in connection with a project of the Kentucky Agr. Exp. Sta. and published with the approval of the Director.

2 Graduate Assistant, Assistant Professor, and Associate Professors of Agronomy, respectively.

Received for publication August 5, 1971. Accepted for publication September 7, 1971.






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Copyright © 1972 by the Soil Science Society of America.