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Published in Soil Sci Soc Am J 27:546-549 (1963)
© 1963 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Investigations of Nitric Oxide Reactions in Soils1

F. B. Cady and W. V. Bartholomew2

ABSTRACT

The equilibrium reaction between NO (nitric oxide) and nongaseous compounds in the denitrification process was studied. Increments of NO were added to or removed from denitrification systems during the course of incubation.

Nitric oxide rapidly equilibrates isotopically with non-gaseous products during the early stages of denitrification. Under acid soil conditions NO appeared in the gaseous phase. Under basic soil conditions NO did not appear from denitrification reactions but added NO persisted in the system and isotopically equilibrated with the non-gaseous products in the soil. The equilibrium reactions between NO and the nongaseous compounds in the denitrification system could not be adequately explained by the conventional equation 3NO2- + 3H+ {rightleftarrows} NO3- + H+ + 2NO + H2O. The hypothesis is advanced that other reactions and products are involved.

NOTES

1 Contribution from the Soil Science Department, North Carolina State College and the Soil and Water Conservation Research Division, ARS, USDA. Published with the approval of the Director of the North Carolina Agr. Exp. Sta. as paper No. 1510 of the Journal Series.

2 Formerly Soil Scientist, Eastern Soil and Water Management Research Branch, ARS, USDA, now Assistant Professor of Statistics, Iowa State University; and Professor of Soil Science, North Carolina State College, respectively.

Received for publication September 24, 1962. Accepted for publication December 27, 1962.






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