Mitigating Methane Emissions from Rice Fields in Asia
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Rice cultivation has a significant effect on global warming through the emission of a greenhouse gas, methane, from flooded rice fields. The challenge is to develop mitigation technologies that are acceptable to farmers and provide beneficial impact on the budget of greenhouse gases. Results of an interregional research project conducted under different rice ecosystems in 5 countries provide sufficient knowledge of processes controlling CH4 fluxes within which mitigation technologies can be developed. Defined midseason aeration and drying before harvest that reduce CH4 fluxes without reducing nitrogen efficiency and rice yields is feasible in irrigated rice during dry seasons. Developing rice cultivars with lower CH4 emission potentials, optimizing residue recycling and organic amendment and using sulfate containing fertilizer would supplement modifications of water regimes. Mitigation strategies for irrigated rice are also applicable to rainfed rice. But the uncertain water supply may have to be modified because of increase in another greenhouse gas, nitrous oxide. Mitigation options under this ecosystem may include developing rice cultivars with low emission potential.
Keywordsmethane emission rice fields Asia mitigation options
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