Mitigation Potential of Nitrous Oxide Emissions from Irrigated Rice Fields by the DNDC-Rice Model

Abstract

The DNDC-Rice model was used to obtain mitigation potential of N 2 O emission from flooded rice fields under various water management regimes in central Thailand. The alternative water management (midseason drainage, multiple drainage, and local method) emitted approximately 61% of N 2 O emissions higher than conventional water management (continuously flooded). The short drainage period (local method) emitted the lowest emission compared to other treatments. There was no difference in crop carbon, harvest part, shoot and root portion among 4 treatments. Also, the efficiency of nitrogen uptake by the crop of all treatments was not different. The continuously flooded and short drainage period is an interesting candidate for mitigating N 2 O emissions from irrigated rice cultivation. However, multiple drainages are a remarkable effective practice to reduce greenhouse gases (CH 4 and N 2 O) emissions from the rice field.