논토양에서 바이오차르 투입 및 완효성비료 시용에 따른 메탄발생량과 작물생산량 변화
Changes in Crop Yield and CH4 Emission from Rice Paddy Soils Applied with Biochar and Slow-release Fertilizer
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Emission reduction of CH4 (methane gas) from rice paddy soil is a very important measurefor climate change mitigation in agricultural sector. In this study, we investigated the changesin crop yield and CH4 emissions in response to application of biochar and fertilizers. The experimentalsite is located in Hwasung, Kyunggido and experimental design is the split-plot methodwith three replicates. Treatments included rice straw (RS) and biochar (BC) amendments nestedwith the conventional NPK fertilizer (NPK) and slow release fertilizer (SRF). Control was alsoprepared with the soil with the conventional NPK fertilization with no amendment. Measurementof 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 biocharapplication with slow release fertilizer, CH4 emission was reduced by 45%. Further, the cropyield was also increased in all treatments compared with the control except for the treatment ofrice straw application with slow release fertilizer. Overall results imply that biochar amendmentto agricultural soil can be an effective strategy to decrease annual CH4 emission with no reductionin crop yield.
Abstract
Emission reduction of CH4 (methane gas) from rice paddy soil is a very important measurefor climate change mitigation in agricultural sector. In this study, we investigated the changesin crop yield and CH4 emissions in response to application of biochar and fertilizers. The experimentalsite is located in Hwasung, Kyunggido and experimental design is the split-plot methodwith three replicates. Treatments included rice straw (RS) and biochar (BC) amendments nestedwith the conventional NPK fertilizer (NPK) and slow release fertilizer (SRF). Control was alsoprepared with the soil with the conventional NPK fertilization with no amendment. Measurementof 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 biocharapplication with slow release fertilizer, CH4 emission was reduced by 45%. Further, the cropyield was also increased in all treatments compared with the control except for the treatment ofrice straw application with slow release fertilizer. Overall results imply that biochar amendmentto agricultural soil can be an effective strategy to decrease annual CH4 emission with no reductionin crop yield.
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