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A Comparison of the Dry Combustion and the Rapid Dichromate Titration Methods for Determining Organic Matter in Soil¹

ABSTRACT

A comparison was made of the dry-combustion and the Wakley and Black rapid-titration methods for determining organic matter in fifty soil samples of widely different origin, physical characteristics, and organic-matter content, collected in connection with infiltration studies.

After correcting the rapid titration method by an appropriate factor certain of the soils still show considerable variation from the data obtained by the dry-combustion method. While dry-combustion is probably the most reliable method available at present for determining the organic-matter content of soils, the rapid-titration method gives valuable approximate results even though the soils vary widely in origin, physical characteristics, and organic-matter content.

¹ Co-operative investigations of the Division of Research, Soil Conservation Service, U. S. Dept. of Agriculture, and West Virginia Agricultural Experiment Station.

² Soil Conservationist, U. S. Dept. of Agriculture, Washington, D. C. The writer wishes to acknowledge the assistance of Ford M. Milam, Co-operative Agent, Soil Conservation Service, and the West Virginia Agricultural Experiment Station, in obtaining the data reported in this paper.