The Effect of Nitrite and Organic Matter on Aerobic Gaseous Losses of Nitrogen from a Calcareous Soil1
- B. D. Meek and
- A. J. MacKenzie2
The loss of gaseous nitrogen compounds when nitrite accumulates in a calcareous silty clay loam during nitrification was investigated under aerobic conditions.
Soil to which either (NH4)2SO4, NaNO2, or (NH4)2SO4 + barley straw was added, was incubated at 28C and 31% moisture for 28 days. Samples were maintained under aerobic conditions in a N-free atmosphere of 21% oxygen and 79% helium. Gas samples were taken every 7 days from the incubation flasks and analyzed, using a gas chromatograph, for gaseous N products evolved. The accumulation of nitrite was measured on separate soil samples incubated in the same manner as the flasks used to secure gas samples.
The gaseous N forms produced were N2O and N2. It was found that losses were low even when large amounts (250 ppm) of nitrite-N accumulated. The gaseous N loss was 1.3% for (NH4)2SO4 and NaNO2 and 3.6% for the (NH4)2SO4 + barley straw treatment.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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