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This article in SSSAJ

  1. Vol. 38 No. 2, p. 294-299
    Received: Aug 6, 1973
    Accepted: Dec 10, 1973

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Nitrogen Transformations in Soil During Leaching: II. Steady State Nitrification and Nitrate Reduction1

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



Nitrogen transformations were examined by means of a miscible displacement technique that permitted passage of air with different levels of oxygen through the soil. With the use of steady state solutions of equations describing the convective transport of NH4+ and NO3- ions in Columbia silt loam, first-order reaction rate constants k1 and k2 were ascertained for NH4+-oxidation and NO3--reduction, respectively. Values of k1 were measured to be ten-fold greater than those of k2. At an oxygen level of 0.5% in the gaseous phase, nitrification was apparently inhibited.

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