Effect of soil oxidants KNO3, MnO2, and air on methane production in flooded rice soil suspension

摘要

To determine effective means to reduce methane (CH4) production from flooded rice soil, laboratory measurements were made on methane (CH4) formation in a Crowley silt loam as affected by the addition of potassium nitrate (KNO3), manganese dioxide (MnO2), and air (O-2) under flooded conditions. In the experiment, oxidants were added to the soil prior to flooding at the rate of 300 and 1000 ppm O-2 equivalent. Methane production was measured over a 32 d incubation period. Potassium nitrate added at rates of 300 and 1000 ppm O-2 equivalent reduced CH4 production by 100 and MnO2, at 300 and 1000 ppm O-2 equivalent, significantly decreased CH4 formation approximately 20 and 98-99 over the 32 d period, respectively compared to controls. Air addition did not significantly affect CH4 formation. References: 18