The Mitigation in Irrigated Rice Systems in Asia (MIRSA) project is a project of the Paddy Rice Research Group.
The MIRSA project focuses on greenhouse gas mitigation in irrigated rice paddies in South-East Asia. Simultaneous experimental field trials were initiated in Sept 2013 in Jakenan (Indonesia), Nueva Ecija (Philippines), Prachin Buri (Thailand), and Hue (Vietnam), and continued for 6 seasons (3 years) to assess the site-specific feasibility of alternate wetting and drying (AWD) as a mitigation option for CH4 and N2O emissions from irrigated rice fields. The study aims to develop standardised protocols on the effective implementation of alternate wetting and drying at multiple locations in South-East Asia to achieve the emission reduction target of 30% relative to the conventional water management, and to acquire a generalised scientific knowledge about the influence of alternate wetting and drying on GHG emission reduction. The results have shown the effectiveness of alternate wetting and drying to reduce CH4 and N2O emissions.
On completion of the project, the results will be communicated directly to farmers.
The MIRSA project tests three different types of practice:
- Continuous flooding (used as the reference practice)
- Safe alternate wetting and drying: naturally drained until the surface water table is reached at -15cm, then irrigated
- Site-specific alternate wetting and drying: based on scientific experience of each monitoring site (ie, this can differ in the practice among sites)