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논토양에서 바이오차르 투입 및 완효성비료 시용에 따른 메탄발생량과 작물생산량 변화
김대균 ( Dae Gyun Kim ),조광래 ( Kwang Rae Cho ),원태진 ( Tae Jin Won ),박인태 ( In-tae Bak ),유가영 ( Ga Young Yoo ) 한국환경생물학회 2014 환경생물 : 환경생물학회지 Vol.32 No.4
Emission reduction of CH4 (methane gas) from rice paddy soil is a very important measure for climate change mitigation in agricultural sector. In this study, we investigated the changes in crop yield and CH4 emissions in response to application of biochar and fertilizers. The experimental site is located in Hwasung, Kyunggido and experimental design is the split-plot method with three replicates. Treatments included rice straw (RS) and biochar (BC) amendments nested with the conventional NPK fertilizer (NPK) and slow release fertilizer (SRF). Control was also prepared with the soil with the conventional NPK fertilization with no amendment. Measurement of CH4 emission was conducted during the growing season of 2014 using a dynamic chamber method. The results showed that application of rice straw increased daily CH4 emission rate by 15%, while application of biochar reduced daily CH4 emission rate by 38%. When we combined biochar application with slow release fertilizer, CH4 emission was reduced by 45%. Further, the crop yield was also increased in all treatments compared with the control except for the treatment of rice straw application with slow release fertilizer. Overall results imply that biochar amendment to agricultural soil can be an effective strategy to decrease annual CH4 emission with no reduction in crop yield.