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Water management and methane emission from rice cultivation: A case study in An Giang province, Viet Nam

The objectives of this study was to determine impacts of water management on the emission of CH4 and rice yield. Experiment was conducted in field conditions in An Giang province, Viet Nam with three treatments as continuous flooding (CF), An Giang Alternative Wetting and Drying (AAWD) which is mostly applied by farmers in An Giang province-Viet Nam, and Alternate Wetting and Drying (AWD). | Journal of Science and Technology 54 (2A) (2016) 91-97 WATER MANAGEMENT AND METHANE EMISSION FROM RICE CULTIVATION: A CASE STUDY IN AN GIANG PROVINCE, VIET NAM Duong Mai Linh1, Kenji Ishido2, Tomohiko Taminato3, Nguyen Huu Chiem4, Nguyen Xuan Loc4, * 1 Faculty of Science - Technology - Environment, An Giang University, 18 Ung Van Khiem, Long Xuyen City, An Giang, Vietnam 2 Japan International Research Center for Agriculture Sciences, 1-1 Ohwashi, Tsukuba City, Ibaraki Prefecture, Japan; 3 Agriculture, Forestry and Fishery Department, Cabinet office Okinawa General Bureau, Japan 4 College of Environment and Natural Resources, Can Tho University, 3/2 Street, Ninh Kieu District, Can Tho City, Vietnam * Email: nxloc@ctu.edu.vn Received: 1 April 2016; Accepted for publication: 15 June 2016 ABSTRACT Rice cultivation causes the emission of CH4 consequenced to the global warming. Reduction of irrigation in rice cultivation is not only saving water resources but also reducing greenhouse gases emission. The objectives of this study was to determine impacts of water management on the emission of CH4 and rice yield. Experiment was conducted in field conditions in An Giang province, Viet Nam with three treatments as continuous flooding (CF), An Giang Alternative Wetting and Drying (AAWD) which is mostly applied by farmers in An Giang province-Viet Nam, and Alternate Wetting and Drying (AWD). Water levels in the field +5 cm, ± 5 cm and -15 cm were controlled higher, fluctuated and lower than soil surface, respectively for CF, AAWD and AWD. CH4 emission determined every week during 13 weeks of the experiment. Rice yield was determined in 1 m2 at the end of the experiment. The results showed that AWD and AAWD, respectively decreased 78.7 % (p 0.05) CH4 emission compared to the CF 11.9 mg CH4/m2/h. The rice yield of CF was 6.32 ton/ha lower than AAWD 7.8 ton/ha (p 0.05) with AWD treatment 6.36 ton/ha. Therefore, AWD application should be considered to apply in An Giang .