Chapter 7 Redox Potential Control on Cumulative Global Warming Potentials from Irrigated Rice Fields

Rice cultivation shifts between aerobic and anaerobic environment, making it a potential CH4 source during flooding and a N2O source during drainage. A favorable redox “window” of +180 to –150 mV was found where both N2O and CH4 productions were low. The trade-off emissions of CH4 and N2O found in rice field can be minimized by manipulating the soil profile through proper irrigation and drainage to maintain a favorable redox distribution. Various soil redox active components can effectively buffer the soil Eh change, in which Iron (Fe) probably plays a critical role. Development of best management practice in irrigated rice fields to mitigate greenhouse gas (GHG) emissions should consider reaching an overall minimum cumulative global warming potential (GWP) from CH4 and N2O emissions but not decreasing rice yield.

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