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Published in Soil Sci Soc Am J 27:374-377 (1963)
© 1963 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Manometric Study of Nitrogen Utilization During Early Stages of Cellulose Decomposition in Soils1

R. H. Miller and E. L. Schmidt2

ABSTRACT

Cellulolytic activity in 50-g. samples of Nicollet silty clay loam and Anoka loamy fine sand was followed continuously in a Warburg respirometer for periods of 240 to 331 hours. Experiments with varying rates and kinds of inorganic N treatments, and with varying rates of cellulose substrate led to the determination of oxygen uptake curves which were descriptive of the maximal rate of cellulose decomposition for each soil. Additions of 5 mg. of ammonium-N and 1.0 g. of cellulose gave maximal activity in the Nicollet while an addition of 15 mg. of ammonium-N and 1.0 g. of cellulose was necessary to obtain similar activity in the Anoka. Treatment with P was found necessary for the Anoka but not for the Nicollet to achieve maximal cellulolytic activity.

The acceptability of humic acid to the cellulolytic microflora as a source of N was compared to that of inorganic N. Oxygen uptake curves reflected differences in the availability of humic acid N to the cellulose-decomposing microflora of the two soils, but availability was slight in either soil.

NOTES

1 Paper No. 4934 Scientific Journal Series, Minnesota Agr. Exp. Sta., University of Minnesota, St. Paul. Contribution from Department of Soil Science. Data taken from a thesis submitted by the senior author in partial fulfillment of the requirements for the M.S. degree. Presented before Div. III, Soil Science Society of America, St. Louis, Missouri, Nov. 30, 1961.

2 Research Assistant in Soils, University of Minnesota, and Associate Professor, jointly, Department of Soil Science and Department of Microbiology, University of Minnesota, respectively.

Received for publication September 21, 1962. Accepted for publication December 10, 1962.






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