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2025 Vol.58, Issue 1 Preview Page

Original research article

Methane emission from paddy soil with different transplanting time of rice (Oryza sativa L.) in Gyeongsang region
Sung Un Kim1
,
Hyun Ho Lee2
,
Dong Hyun Kim3
,
Geon Hyeong Lee3
,
Chang Oh Hong4*
1Post-doctoral Research Associate, Department of Life Science and Environmental Biochemistry, Pusan National University, Miryang 50463, Republic of Korea
2Post-doctoral research associate, Institute for Microbiology, Leibniz University Hannover, Hannover, 30419, Germany. Address: Herrenhäuser Str. 2
3Master’s Student, Department of Life Science and Environmental Biochemistry, Pusan National University, Miryang 50463, Republic of Korea
4Professor, Department of Life Science and Environmental Biochemistry, Pusan National University, Miryang 50463, Republic of Korea
*Corresponding Author
28 February 2025. pp. 71-80
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Abstract

Methane (CH4) emissions from paddy soil significantly contribute to global greenhouse gas emissions, with transplanting time being a significant factor influencing CH4 flux. This study evaluated the effects of four different transplanting times with 15 days intervals (1st 2022/05/10, 2nd 2022/05/25, 3rd 2022/06/10, and 4th 2022/06/25) on CH4 emissions in a paddy soil in the Gyeongsang region of South Korea. Using a closed chamber method, CH4 flux was measured weekly throughout the growing season of rice. The results showed that CH₄ emissions increased during the early growing stage, peaked, and subsequently decreased. Cumulative CH4 emissions were highest for the 1st transplanting time (2022/05/10) and decreased significantly with later transplanting times, reaching a 65% reduction for the 4th transplanting time (2022/06/25). The optimal transplanting time when CH4 emissions were minimized in Gyeongsang region, South Korea was on June 25. Correlation analysis indicated a significant correlation between root biomass and cumulative CH₄ emissions. This implied that root biomass of rice was related to CH4 transport and production. The results of this study clearly demonstrated that modifying transplanting time of rice could be an effective strategy for reducing CH4 emissions from paddy soil.

Cumulative CH4 emissions for different transplanting times.
Keywords
Methane
Rice paddy
Root biomass
Transplanting time
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Information
  • Publisher :Korean Society of Soil Science and Fertilizer
  • Publisher(Ko) :한국토양비료학회
  • Journal Title :Korean Journal of Soil Science and Fertilizer
  • Journal Title(Ko) :한국토양비료학회 학회지
  • Volume : 58
  • No :1
  • Pages :71-80
  • Received Date : 2025-01-17
  • Revised Date : 2025-02-13
  • Accepted Date : 2025-02-17
  • DOI :https://doi.org/10.7745/KJSSF.2025.58.1.071
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