Rice is one of the most water‑intensive crops in the world, with traditional continuous flooding methods consuming up to 3,000 liters of water per kilogram produced. As water scarcity and climate pressures intensify, farmers are adopting Alternate Wetting and Drying (AWD), a sustainable irrigation technique that conserves water while maintaining yields.
AWD works by allowing rice fields to dry intermittently before being re‑flooded. Farmers use a simple perforated PVC tube to monitor subsurface water levels and irrigate only when the water drops 15 centimeters below the soil surface. This cycle reduces pumping costs, improves water‑use efficiency, and supports climate‑resilient farming.
The benefits are significant. AWD can cut irrigation water use by 15–30% compared to continuous flooding, while reducing methane emissions by up to 70%. It also enhances soil nutrient dynamics, improving nitrogen and zinc uptake and boosting soil quality. Farmers report comparable yields with lower input costs, making AWD both economically and environmentally beneficial.
Training and demonstration plots have been crucial in shifting perceptions, as many rice‑growing communities traditionally believed rice must remain submerged. With proper guidance, AWD is proving to be a scalable solution that reduces water consumption, lowers greenhouse gas emissions, and strengthens soil health.
As climate variability increases, AWD offers a practical pathway toward sustainable rice intensification, ensuring food security while protecting vital water resources.
