Rice Yield and Methane Emission in Response to Rice Variety and Irrigation Managements

A scarcity of available water resources for rice production makes the evaluation of rice yield and greenhouse gas emission. Three forms of irrigation management (normal amount [NA], 70% of NA [NA70%], and 30% of NA [NA30%]) and 2 rice varieties (Oryza sativa L. cv. Hanyou 8 and Huayou 14) were examined to determine the effects of variety use and irrigation amount on rice yield and CH₄ emission. Hanyou 8 is a rice variety characterized by its ability to resist drought, while Huayou 14 is a common rice variety. Consequently, NA70% and NA30% significantly decreased rice yield by 6.3% and 10.1%, respectively, for Huayou 14 when compared with NA. Conversely, we observed no statistically significant differences in rice yield when different irrigation amounts were applied for the Hanyou 8 variety. NA30% decreased total CH₄ emission by 51.0 -76.7% for Hanyou 8 and 51.4 -52.9% for Huayou 14 when compared with NA.