Nitrogen Transformations in Soil During Leaching: III. Nitrae Reduction in Soil Columns1
- C. Misra,
- D. R. Nielsen and
- J. W. Biggar2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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