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Published in Soil Sci Soc Am J 27:302-304 (1963)
© 1963 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Immobilization and Mineralization of Nitrogen in Several Organic Fractions of Soil1

B. A. Stewart, L. K. Porter and D. D. Johnson2

ABSTRACT

Straw and N fertilizers were incubated in soil and changes in content of some organic N fractions were measured. Ammonia and nitrate N, as well as the N in several organic fractions, were determined to detect changes in the organic fractions which could be related to increases or decreases in the inorganic N.

Most of the N immobilized during incubation with soil and straw was found in the nondistillable acid-soluble N fraction of the hydrolysate. Although the nondistillable acid-soluble N fraction constituted only about one-half of the total organic N, studies using N15 showed that about about three times as much fertilizer N went into this fraction during immobilization as went into the distillable acid-soluble and acid-insoluble N fractions combined.

NOTES

1 Contribution from the Soil and Water Conservation Research Division ARS, USDA, and the Department of Agronomy, Colorado State University, Ft. Collins, Scientific Journal Series 752. Part of a dissertation submitted in partial fulfillment of the requirements for the Ph.D. degree by the senior author. Presented before the Western Society of Soil Science, June 21, 1961, at Davis, Calif.

2 Soil Scientists. USDA, Fort Collins, Colo., and Professor of Soils, Colorado State University, Fort Collins, respectively.

Received for publication April 21, 1962. Accepted for publication November 14, 1962.






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