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Retention and Cation-Exchange Properties of Organic Matter in Coastal Plain Soils¹

ABSTRACT

Soil organic matter is quite important as a source of cation-exchange capacity in Coastal Plain soils. The amount of organic matter in well-drained soils is directly related to the clay content. In the very poorly drained soils this direct relationship was not apparent.

The cation-exchange capacity of soil organic matter varied from 62 to 279 me. per 100 g. The nature of the exchangeable hydrogen of organic matter was measured by the use of several replacing solutions. A portion of the exchangeable hydrogen in soil organic matter was found to come from strong acid groups.

¹ Contribution from the Department of Soils, North Carolina Agr. Exp. Sta., Raleigh. Submitted with the approval of the Director as Paper No. 1320 of the Journal Series.

² Associate Professor of Soils and Director, and Agronomist, Soil Testing Division, North Carolina Department of Agriculture, respectively.

Received for publication June 3, 1961. Accepted for publication July 19, 1961.