Effect of incorporation of wheat straw and nitrogen addition on the flux of soil gases (CH4 and N2O) at two moisture and temperature regimes
Methane and nitrous oxide contribute to global warming of the earth's atmosphere. The concentration of CH4 and N2O in the atmosphere is increasing at an alarming rate of 1% and 0.25% yr-1, respectively. Little information is available about the effect of agronomic practices on soil gases emitted from cultivated soils in the prairies. An incubation study was undertaken to understand the effects of agronomic management practices and environmental factors on CH4 and N2O emissions from a cultivated soil. Methane production was preceded by a two week lag phase, and it was emitted only from submerged soils incubated at 25°C. Addition of straw enhanced the emission and N addition reduced the rate of CH4 production. Soil incubated at -30kPa moisture may act as a sink for methane. Emission of N2O was observed within 2 days of submergence and was maximum when nitrogen alone was added to the soil. Addition of wheat straw along with nitrogen decreased the emission of N2O as compared to nitrogen alone. Temperature of 10 °C and moisture at -30kPa limited the emissions of N2O from the soil.
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