Korean Journal of Agricultural Science (농업과학연구)

Institute of Agricultural Science, CNU (충남대학교 농업과학연구소)
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Assessment of methane emission with application of rice straw in a paddy field

  • Choi, Eun Jung (Department of Agricultural Environment, National Institute of Agricultural Sciences) ;
  • Jeong, Hyun Cheol (Office of the administrator, Rural Development Administration) ;
  • Kim, Gun Yeob (Department of Agricultural Environment, National Institute of Agricultural Sciences) ;
  • Lee, Sun Il (Department of Agricultural Environment, National Institute of Agricultural Sciences) ;
  • Gwon, Hyo Suk (Department of Agricultural Environment, National Institute of Agricultural Sciences) ;
  • Lee, Jong Sik (Department of Agricultural Environment, National Institute of Agricultural Sciences) ;
  • Oh, Taek Keun (Department of Bio-environmental Chemistry, Chungnam National University)
  • Received : 2019.08.14
  • Accepted : 2019.10.16
  • Published : 2019.12.31
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Abstract

A flooded rice field is one of the significant sources of anthropogenic methane (CH4) with the intensity of the emissions dependent on management practices. Incorporation of rice straw, which is one of the organic amendments, induces the increase of methane emissions during the flooding season. In this study, we measured of methane emission according to applications of rice straw in different soil textures during a cultivation period in 2017 and 2018. The fallow treatments were non application of rice straw (NA), spring plowing after spring spreading of rice straw (SPSA), spring plowing after previous autumn spreading of rice straw (SPAA), and autumn plowing after previous autumn spreading of rice straw (APAA). The SPSA treatment emitted the highest total methane from loam soil in both 2017 (596.7 CH4 kg ha-1) and 2018 (795.4 CH4 kg ha-1). The same trend was observed in silt clay loam soil; the SPSA treatment still emitted the highest amount of methane in both 2017 (845.9 CH4 kg ha-1) and 2018 (1,071.7 CH4 kg ha-1). The lowest emission among the rice straw incorporated plots came from the APAA treatment for both soil texture types in all the seasons. The conversion factors of the SPAA were 0.79 and 0.65 from the loam and silt clay loam soils, respectively. Relatedly, the conversion factors of the APAA were 0.71 and 0.43 from the loam and silt clay loam soils, respectively. The above observations mean therefore that incorporation of rice straw early in the fallow reduces methane emissions in the main rice growing season.

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References

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