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The Effect of Nitrate on Nitrous Oxide Reduction in Organic Soils and Sediments¹

ABSTRACT

Inhibition of N₂O reduction by NO₃^- in cultivated Pahokee muck was determined by measuring N₂O accumulation in soil samples incubated in the presence and absence of acetylene. At NO₃^--N levels of 40 mg/liter or greater, nearly 100% of the gaseous denitrification products were N₂O in Pahokee muck. Reduction of the accumulated N₂O proceeded rapidly after the NO₃^- was exhausted from the soil. In comparison, N₂O was readily reduced in ditch sediment samples in the presence of comparable concentrations of NO₃^-. With NO₃^--N concentrations in the ditch sediments ranging from 90 to 39 mg/liter, < 10% of the gaseous denitrification products were N₂O. Similarly, NO₃^- levels in soil samples from a vegetable field which had been flooded 22 days had negligible effect on N₂O reduction. These data demonstrate that the inhibitory effect of NO₃^- on N₂O reduction was less in sediments and in organic soils that had been subjected to prolonged flooding than in the cultivated soils.

¹ The work upon which this publication is based was supported in part by funds provided by the U. S. Dep. of the Interior, Office of Water Research and Technology as authorized under the Water Resources Research Act of 1964 as amended. Florida Agric. Exp. Stn. Journal Series no. 2104.

² Assistant Professors, Univ. of Florida, Agric. Res. and Educ. Center, P. O. Drawer A, Belle Glade, FL 33430. The senior author's present address is Dep. of Agronomy & Horticulture, Brigham Young Univ., Provo, UT 84602.

Received for publication November 13, 1979. Accepted for publication April 4, 1980.