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Published in Soil Sci Soc Am J 25:312-316 (1961)
© 1961 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Changes in the Clay Content, Calcium Carbonate Equivalent, and Calcium/Magnesium Ratio With Depth in Parent Materials of Soils Derived from Calcareous Till of Wisconsin Age1

Kenneth A. Wenner, N. Holowaychuk and George M. Schafer2

ABSTRACT

Several depth samplings of parent materials (medium and moderately fine-textured calcareous till) of each of 42 soil profiles were analyzed for clay content, CaCO3 equivalent and the quantities of Ca and Mg extractable with acid. As a rule the clay content decreased, and the CaCO3 equivalent content and the Ca/Mg ratio increased with depth in the upper 30 inches. Little or no variation in the respective values of these properties were observed below this depth. On basis of this work, samples for characterization of calcareous Wisconsin till materials should be collected at about 30 inches below the point of initial effervescence.

NOTES

1 Contribution from the Department of Agronomy, Ohio Agr. Exp. Sta., State Project 106, Journal Paper No. 66-60, and Soil Conservation Service, USDA. Presented before Div. V, Soil Science Society of America, Cincinnati, Ohio, Nov. 18, 1959.

2 Soil Scientist, SCS, Professor of Agronomy, Ohio Agr. Exp. Sta., and Soil Scientist, SCS, Columbus, Ohio, respectively. The authors are grateful to Dr. P. E. Smith, Department of Agronomy, Ohio State University for counsel and assistance in statistical analysis.

Received for publication September 2, 1960. Accepted for publication December 30, 1960.






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