_____________________________________________________________________________________________________ *Corresponding author: E-mail: sawminster@gmail.com; Email: martin.rulik@upol.cz; International Journal of Plant & Soil Science 32(19): 22-37, 2020; Article no.IJPSS.63865 ISSN: 2320-7035 Effects of Different Water Management and Fertilizer Applications on CO 2 Fluxes from a Selected Myanmar Rice (Oryza sativa L.) Cultivar Saw Min 1* and Martin Rulik 1 1 Department of Ecology and Environmental Sciences, Palacký University Olomouc, Czech Republic. Authors’ contributions This work was carried out in collaboration between both authors. Authors SM and MR conceived the study design. Author SM implemented the greenhouse experiment, collected and analyzed the statistical data. Author SM wrote the first draft of the manuscript with the help author MR. Author MR commented on and edited the manuscript. Both authors have read and agreed to final version of the manuscript. Article Information DOI: 10.9734/IJPSS/2020/v32i1930394 Editor(s): (1) Dr. Francisco Cruz-Sosa, Metropolitan Autonomous University, México. Reviewers: (1) Ricardo Rafael Ribeiro da Silva, Federal University of São Carlos, Brazil. (2) Márcia Denise Rossarolla, Federal University of Santa Catarina, Brazil. Complete Peer review History: http://www.sdiarticle4.com/review-history/63865 Received 24 October 2020 Accepted 29 December 2020 Published 31 December 2020 ABSTRACT The application of nitrogen fertilizer and the water management practices are important to optimize potential yields in rice cultivation. Moreover, they may affect the emissions patterns of methane (CH 4 ) and carbon dioxide (CO 2 ) emission. Compared to methane, knowledge about the combined effects of different fertilizer rates together with different water management practices on CO 2 fluxes are scarce. Therefore, this study aims to assess CO 2 fluxes of a selected rice cultivar in response to different fertilizer applications and water management practices. The treatments included two different applications of inorganic fertilizer (recommended rate and farmer’s practice), organic manure application and water management practices; continuous flooding (CF) and alternate wetting and drying (AWD). Mean total CO 2 flux in CF was -30.82 g CO 2 m -2 d -1 during daytime and 29.64 g CO 2 m -2 d -1 during nighttime. Surprisingly, the average net CO 2 fluxes were negative under both CF (-49 mg CO 2 m -2 h -1 ) and AWD practices (-127 mg CO 2 m -2 h -1 ), indicating a net CO 2 uptake by the rice plants. Inorganic fertilizer applications led to considerably higher net CO 2 emissions compared to the control under both CF and AWD. Conversely, CO 2 emission fluxes in the treatment with organic manure showed negative net CO 2 fluxes under both water management practices and Original Research Article