Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Evaluation of N2O Emissions by Nutrient Source in Soybean and Pepper Fields

콩과 고추재배지에서 양분 공급원별 N2O 배출량 평가

  • 김건엽 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 이선일 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 이종식 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 정현철 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 최은정 (농촌진흥청 국립농업과학원 기후변화생태과)
  • Received : 2018.11.20
  • Accepted : 2018.12.18
  • Published : 2018.12.31
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Abstract

Nitrogen fertilizers, hairy vetch, and slow-release complex fertilizers were applied to the soil during the cultivation of crops. The impact of these factors on $N_2O$ emission was quantitatively assessed and the GHGs reduction effect comprehensively evaluated. Among the three factors, the significant factors affecting $N_2O$ emission were mineral nitrogen>soil moisture>temperature. Yield and fertilizer utilization efficiency were highest in the slow-release complex fertilizer treatment. There was no significant difference in $N_2O$ emissions between the slow-release complex fertilizer treatments and the NPK+hairy vetch treatments. Comprehensive results showed that slow-release complex fertilizers treatment has high yield and fertilizer utilization efficiency but low $N_2O$ emission.

작물 재배시에 질소비료와 유기물인 헤어리베치 그리고 LCU효과지연성 복합비료 등 질소공급원별로 토양에 시용하여 $N_2O$ 배출에 영향을 주는 요인들의 특성을 조사하였다. 그리고 그 요인들이 $N_2O$ 배출에 얼마나 영향을 주는지를 정량적으로 밝히고 온실가스 배출의 영향 인자들에 대해 온실가스 감축 효과를 종합적으로 평가하였다. $N_2O$ 배출에 영향을 미치는 요인은 토양온도, 토양수분과 무기태질소 등이다. 이 세 가지 요인 중 $N_2O$ 배출에 가장 크게 영향을 미치는 요인은 무기태질소(콩 65.5%, 51.2%)>토양수분함량(콩 19.2%, 고추 28.8%)>토양온도(콩 15.2%, 고추 22.0%) 순으로 나타났다. 수량과 비료이용효율은 LCU효과지연성 복합비료 처리에서 가장 높았다. $N_2O$ 배출량은 LCU효과지연성 복합비료와 NPK+헤어리베치 처리에서 차이를 보이지 않아 종합적인 결과는 수량과 비료이용효율 그리고 낮은 $N_2O$ 배출량을 보인 LCU효과지연성 복합비료 처리가 가장 양호한 것으로 나타났다. 따라서 앞으로 $N_2O$ 배출을 저감할 수 있는 토양 양분관리 기술 개발 연구가 확대되면 온실가스 배출저감 대책에 도움이 될 것으로 기대할 수 있다.

Keywords

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