콩과 고추재배지에서 양분 공급원별 N2O 배출량 평가
Evaluation of N2O Emissions by Nutrient Source in Soybean and Pepper Fields
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초록
작물 재배시에 질소비료와 유기물인 헤어리베치 그리고 LCU효과지연성 복합비료 등 질소공급원별로 토양에 시용하여 N2O 배출에 영향을 주는 요인들의 특성을 조사하였다. 그리고 그 요인들이 N2O 배출에 얼마나 영향을 주는지를 정량적으로 밝히고 온실가스 배출의 영향 인자들에 대해 온실가스 감축 효과를 종합적으로 평가하였다. N2O 배출에 영향을 미치는 요인은 토양온도, 토양수분과 무기태질소 등이다. 이 세 가지 요인 중 N2O 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 LCU 효과지연성 복합비료 처리에서 가장 높았다. N2O 배출량은 LCU효과지연성 복합비료와 NPK+헤어리베치 처리에서 차이를 보이지 않아 종합적인 결과는 수량과 비료이용효율 그리고 낮은 N2O 배출량을 보인 LCU효과지연성 복합비료 처리가 가장 양호한 것으로 나타났다. 따라서 앞으로 N2O 배출을 저감할 수 있는 토양 양분관리 기술 개발 연구가 확대되면 온실가스 배출저감 대책에 도움이 될 것으로 기대할 수 있다.
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 N2O emission was quantitatively assessed and the GHGs reduction effect comprehensively evaluated. Among the three factors, the significant factors affecting N2O 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 N2O 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 N2O emission.
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