Study on the Application of Alternate Wetting and Drying (AWD) Technique to Reduce Methane Emissions

Abstract

   Study on evaluating the effectiveness of alternate wetting and drying (AWD) irrigation technique in rice cultivation to save water and reduce methane (CH₄) emissions, a pilot project was implemented in Minh Son, Do Luong, Nghe An, utilizing a monitoring tube system to track groundwater levels. The results indicated that alternating between flooded and dry periods in the rice fields helps prevent prolonged anaerobic conditions, thereby significantly reducing greenhouse gas emissions without affecting rice yield. At the same time, AWD reduced irrigation water use by 15 - 30%, saving on water pumping and energy costs, making it suitable for smallholder farmers. Effective implementation of the technique requires coordination among management agencies, local technicians, and farmers, with training, technical guidance, and sharing of successful models playing a key role. The study contributes to the realization of strategic goals in greenhouse gas emission reduction, climate change adaptation, and sustainable agricultural development in Vietnam.