Factors influencing methane emissions in rice paddies using alternate wetting and drying method
Climate Adaptation
Rice paddies are one of the largest human-managed sources of greenhouse gas on Earth, and smarter watering schedules — not high-tech fixes — can dramatically shrink that footprint while feeding billions.
Growing rice in flooded fields releases a lot of methane, a potent greenhouse gas, because waterlogged soil becomes a low-oxygen environment where certain microbes thrive and produce it. This study compared fields kept permanently flooded against fields that were alternately dried out and re-watered at different depths. The fields with shallow, frequent wet-dry cycles produced far less methane and used significantly less water, without harming how well the rice grew.
Key Findings
Alternate wetting and drying at 1 cm and 5 cm depths reduced irrigation water use by over 40% compared to continuous flooding.
The lowest-emission treatments produced methane fluxes of 3.06 and 7.37 mg/m²/hr, versus 17.45–19.88 mg/m²/hr for continuous flooding and deep alternate wetting.
Methane emissions peaked during the heading (flowering) stage across all treatments, driven by mature plant biomass, root exudates, and aerenchyma tissue.
chevron_right Technical Summary
Researchers tested five water management strategies for rice paddies and found that alternate wetting and drying cycles — particularly at shallow depths of 1–5 cm — cut methane emissions by more than half compared to continuous flooding, while also reducing water use by over 40%.
Abstract Preview
BACKGROUND AND OBJECTIVES: Addressing global food security, rice is one of the fundamental food sources, particularly in Southeast Asia where traditional flooded rice cultivation is a major methane...
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