Effects of Application of Nitrogen Fertilizers on Methane Emission in a Paddy Soil

논 토양에서 질소비종이 CH4 배출에 미치는 영향

  • Lee, Kyeong-Bo (National Honam Agricultural Experiment Station, RDA) ;
  • Lee, Deog-Bae (National Honam Agricultural Experiment Station, RDA) ;
  • Kim, Jong-Gu (National Honam Agricultural Experiment Station, RDA) ;
  • Lee, Sang-Bok (National Honam Agricultural Experiment Station, RDA) ;
  • Kim, Jae-Duk (National Honam Agricultural Experiment Station, RDA) ;
  • Han, Sang-Su (National Honam Agricultural Experiment Station, RDA)
  • Published : 2000.06.30

Abstract

This study was conducted to investigate methane emission among nitrogen fertilizers in paddy soil(Jeonbug series, occurring on fluvio-alluvial plain). The application rates of rice straw was $5,000kg\;ha^{-1}$ with $110kg\;N\;ha^{-1}$ as chemical fertilizer. It was found that the methane flux tended to be lower in ammonium sulfate than in urea and latex coated urea(LCU). The seasonal variations of the methane emission flux was high during the heading stage of the rice plant. Methane concentration in the soil solution was the highest at 5cm depth, but decreased with upper and lower depth. Methane emission under rice straw application was $0.265g\;m^{-2}\;day^{-1}$ by urea application. $0.207g\;m^{-2}\;day^{-1}$ by ammonium sulfate application, $0.318g\;m^{-2}\;day^{-1}$ by latex coated urea(LCU) application while methane emission under non rice straw application was $0.192g\;m^{-2}\;day^{-1}$ by urea application, $0.165g\;m^{-2}\;day^{-1}$ by ammonium sulfate application, $0.179g\;m^{-2}\;day^{-1}$ by latex coated urea(LCU) application.