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Published in Soil Sci Soc Am J 50:1215-1218 (1986)
© 1986 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Soil Properties Affecting Formation of Nitric Oxide by Chemical Reactions of Nitrite1

A. M. Blackmer and M. E. Cerrato2

ABSTRACT

Gas chromatography was used to determine the amounts of nitric oxide (NO) in the headspaces above samples of 28 soils that had been autoclaved, treated with nitrite, and sealed in all-glass flasks with He atmospheres for 18 h. When nitrite was added at a rate of 100 mg N kg–1 soil, the amounts of NO-N found ranged from less than 1 to 35 mg kg–1 soil, and statistical analyses indicated that 95% of the variability in the amounts of NO found among the soils could be explained by a model that considered only soil organic C content, pH, and an interaction of these factors. The formation of CO2 and the ratios of NO to NO-3 observed indicate that production of NO cannot be explained solely by self-decomposition of nitrous acid. When various amounts of soil were added to identical samples of nitrite solution, the amounts of NO-N found increased with amounts of soil added. These findings indicate that NO is formed by reactions of nitrite with the organic fraction of soils as well as by self-decomposition of nitrous acid.

NOTES

1 Journal Paper no. J-12063 of the Iowa Agric. & Home Econ. Exp. Stn., Ames. Project 2432. Presented in part before Div. S-2, Soil Sci. Soc. Am., Las Vegas, NV., 27 Nov. 1984.

2 Associate Professor and Graduate Research assistant, respectively, Dep. of Agronomy, Iowa State Univ., Ames IA 50011.

Received for publication October 15, 1986.




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