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Comments on Nitrate Reduction in Unsaturated Soil¹

ABSTRACT

Cyclic oxidation and reduction of nitrite and nitrate in soil are analysed in terms of first- and zero-order microbial kinetic reactions, respectively. A reversible reaction step involving these ions can account for a low, but constant concentration of nitrate in an unsaturated field soil for long periods or for considerable depths in a laboratory soil column.

¹ Contribution from the Dep. of Soils and Plant Nutrition, Univ. of California, Berkeley. Supported by NSF Grant GI-34733X.

² Professor of Soil Biology.

Received for publication December 29, 1975. Accepted for publication May 5, 1976.