Effect of Water Saving Irrigation Management Practices on Rice Productivity and Methane Emission from Paddy Field
Effect of Water Saving Irrigation Management Practices on Rice Productivity and Methane Emission from Paddy Field作者机构：Department of Environmental Science Bangladesh Agricultural University Mymensingh Bangladesh
出 版 物：《Journal of Geoscience and Environment Protection》 (地球科学和环境保护期刊（英文）)
年 卷 期：2020年第8卷第9期
页 面：182-196页
主 题：Water Saving AWDI CH4 GWP Rice Paddy
摘 要：Irrigation water supply is one of the vital components for sustainable rice farming, which is becoming a limiting resource in the changing climatic condition. An experiment was conducted at the research field of Bangladesh Agricultural University, Mymensingh during dry season from January-June of 2017 to investigate the suitability of Alternate Wet and Dry Irrigation (AWDI) for sustainable rice production and reducing methane emission. The modern rice variety BINA Dhan 10 was used as test crop. There were five irrigation treatments viz. T1 (saturated condition), T2 (continuous flooded, 5 cm standing water), T3 (AWDI-10 cm;irrigated when water level fell 10 cm from surface), T4 (AWDI-15 cm;irrigated when water level fell 15 cm from surface) and T5 (AWDI-20 cm;irrigated when water level fell 20 cm from surface). Results of the field trial showed satisfactory grain yield and low seasonal methane emission along with significantly high irrigation water savings (%) in AWDI treated field plots. Among the treatments, T3 (AWDI-10 cm) and T4 (AWDI-15 cm) showed higher yield performance (6250kg.ha-1 and 5810 kg.ha-1, respectively) with lower CH4 emission (reduced up to 36% and 40%, respectively) compared to continuous flooded treatment (T2, CF 5 cm water). In AWDI field plots less irrigation frequency (6 - 9) was required which significantly sav
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