Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Emission Characteristics of Methane and Nitrous Oxide by Management of Water and Nutrient in a Rice Paddy Soil

논에서 물과 양분관리에 따른 메탄CH4), 아산화질소(N2O)배출 특성

  • Kim, Gun-Yeob (National Institute of Agricultural Science and Technology, RDA) ;
  • Park, Sang-Il (Department of Agronomy, College of Agriculture, Chungbuk National University) ;
  • Song, Beom-Heon (Department of Agronomy, College of Agriculture, Chungbuk National University) ;
  • Shin, Yong-Kwang (National Institute of Agricultural Science and Technology, RDA)
  • Published : 2002.06.30
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Abstract

Emission of methane and nitrous oxide affected by nitrogen fertilizer materials were measured simultaneously in rice paddy fields under flooding and intermittent irrigation in 2000. Studies focused on mitigating $CH_4$ emission from rice paddy fields are summarized and the possibilities and limits applied to world's rice cultivation are discussed. The mitigation options are water management, soil amendments, organic matter management, different tillage, rotation, and cultivar selection. Altering water management, in particular promoting midseason aeration by short-term drainage, is one of the most promising strategies, although these practices may be limited to the rice paddy fields where the irrigation system is well prepared. The test site was divided into two water managements: a continuously flooded plot which was maintained flooded by constant irrigation from May to September, and an intermittently drained plot in which short-term (20days) draining practices were performed one times during the flooding period. By total emission of GHGs converted by global warming potential (GWP), flooding plots were higher 170$\sim$208% than interimittent irrigation plots. For emission of GHGs in fertilizer materials, it was high in the order of Swine slurry>Urea+Rice straw>Urea>LCU. Basing on GHGs emission of urea fertilization under flooding as baseline GWP of urea fertilization and Latex-coated urea under intermittent irrigation showed lower GHGs emission by 41.4% and 55.8 respectively. In this case fertilizer use efficiency (kg unhulled rice/ of applied N) were 18.2$\sim$20.2 and 18.7$\sim$19.0 and 9.3 and 5.8$\sim$6.6 for Swine slurry and LCU and Urea+Rice straw and Urea in the continuously flooded and intermittently drained plot.

물관리방법을 달리한 상시담수와 간단관개에서 메탄과 아산화질소의 배출 양상과 서로 다른 종류의 유기물원 및 질소비료 시용에 따른 메탄과 아산화질소 배출을 비교하고 저감할 수 있는 방법을 찾기 위해 본 시험을 실시하였다. 물관리 방법으로는 상시담수 (이앙$\sim$출수 35일까지 담수)와 이앙 35일 이후 중간낙수한 간단관개 (중간낙수기간 20일), 그리고 시비방법으로는 토양을 검정한 시비량인 토양검정, 토양 검정시비량+볏짚, 돈분액비, LCU 완효성비료, 그리고 N을 시용하지 않은 대조구 등을 처리하여 메탄 및 아산화질소 배출량을 측정하였다. 메탄 배출량은 간단관개보다 상시담수께서 높았고, 아산화질소 배출량은 이와 반대로 나타났다. 유기물과 비료시용 종류에 따른 메탄과 아산화질소 배출량은 액비와 검정시비+볏짚시용구에서 가장 높았으며, LCU 완효성비료구에서 가장 낮았다. 지구온난화잠재력으로 환산한 온실가스 배출은 물관리 조건에서 상시담수가 간단관개보다 170$\sim$208% 높았으며, 요소를 시용하고 상시담수를 기준 한 것과 간단관개로 물관리하여 각 처리에 따라 온실가스 배출을 비교하면, 요소는 41.4%, LCU 완효성비료 55.8%로 온실가스 배출을 줄일 수 있는 것으로 나타났다. 그리고 비료이용효율은 LCU 완효성비료, 액비>검정시비+볏짚>검정시비 순이었다.

Keywords

References

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