NITRIC-OXIDE PRODUCTION IN RICE SOILS

  • 1 January 1976
    • journal article
    • research article
    • Vol. A127  (3) , 401-414
Abstract
Nitric oxide gas evolution from nitrite was studied in vitro in 3 rice soils by gas chromatography. Autoclaved soils showed NO evolution when supplemented with nitrite. Incubation temperature soil pH, soil moisture content and nitrite concentration varied in the 3 soils, and with addition of nitrite reductase inhibitors, it appeared in 1 soil that NO production was partially a biological process. NO formation was twice as high in non-sterile soil as in sterile soil, and decreased when the temperature increased. NO production increased with increasing soil moisture content; this NO formation increased much less than in the other 2 soils with increasing nitrite concentration. The 1st soil contained 3 times more denitrifying bacteria tolerating a high nitrite concentration (5 g/l) than the other soils.

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