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Comparison of Effects of Nitrate, Nitrite, and Nitric Oxide on Reduction of Nitrous Oxide to Dinitrogen by Soil Microorganisms¹

ABSTRACT

Recent work has shown that nitrate inhibits reduction of nitrous oxide (N₂O) to dinitrogen (N₂) by soil microorganisms under anaerobic conditions. Studies to investigate the possibility that this inhibition is caused by nitrite or nitric oxide (NO) formed through microbial reduction of nitrate showed that both NO and nitrite inhibit reduction of N₂O to N₂ by soil microorganisms under anaerobic conditions (helium atmosphere) but that the inhibitory effect of NO on N₂O reduction is much smaller than the effects of nitrate or nitrite. Comparison of the effects of nitrate, nitrite, and mixtures of nitrate and nitrite on reduction of N₂O to N₂ by soils incubated under He showed that nitrate per se inhibits N₂O reduction and did not confirm a recent suggestion that the inhibitory effect of nitrate on N₂O reduction is due to nitrite formed through microbial reduction of nitrate.

¹ Journal Paper no. J-10203 of the Iowa Agric. & Home Econ. Exp. Stn., Ames. Project no. 2096. Presented before Div. S-3, Soil Sci. Soc. of Am., Detroit, Mich. 2 Dec. 1980. This work was supported in party by the Nat. Sci. Found., Grant no. ENV77-23835, and by the Dep. of Energy, Contract EY-76-S-02-2530.

² Research Associate, Assistant Professor, and Professor, respectively, Dep. of Agron., Iowa State Univ., Ames, IA 50011.

Received for publication March 12, 1981. Accepted for publication July 28, 1981.

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