SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 28:366-368 (1964)
© 1964 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Determination of Total Nitrogen and Carbon in Soils by a Commercial Dumas Apparatus1

B. A. Stewart, L. K. Porter and W. E. Beard2

ABSTRACT

A modified Dumas procedure is presented, which extends its application to soils of high organic matter content. The modification eliminates the interference of CH4 that often causes values to be from 5 to 20% higher than Kjeldahl values. The instrument used for the Dumas procedure can be easily converted to determine C in soils. Changes necessary for this conversion are presented.

NOTES

1 Contribution from the Soil and Water Conservation Research Division, ARS, USDA, in cooperation with the Colorado Agr. Exp. Sta., Scientific Journal series 865. Presented before Div. S-3, Soil Science Society of America, Nov. 18, 1963, at Denver, Colo.

2 Soil Scientists and Chemist, USDA, Ft. Collins, Colo., respectively.

Received for publication August 6, 1963. Accepted for publication September 11, 1963.






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