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This article in SSSAJ

  1. Vol. 38 No. 2, p. 300-304
     
    Received: Aug 8, 1973
    Accepted: Dec 10, 1973


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doi:10.2136/sssaj1974.03615995003800020026x

Nitrogen Transformations in Soil During Leaching: III. Nitrae Reduction in Soil Columns1

  1. C. Misra,
  2. D. R. Nielsen and
  3. J. W. Biggar2

Abstract

Abstract

Nitrate reduction in water-unsaturated Columbia silt loam columns was examined at 19.5C and 34.5C with three levels of oxygen (0.5, 5, and 20%) in an aerating gas passing through the soil. Following a continuous application of NH4+ solution, a pulse of a NO3- solution was leached through these columns. After the decay of the pulse, a continuous application of NO3- solution allowed mathematical analysis leading to ascertaining NO3- reduction rate coefficients. The temperature dependence of these constants as a function of oxygen composition was discussed and the need for microbial population and activity analysis is emphasized.

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