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강제 호기 호흡계를 이용한 녹비 및 유기자재 처리 토양의미생물 활성 실시간 모니터링과 분해율 평가
정석호, 박종찬, 이은진, 조진웅, 정덕영, 이상은, 유진희, 강항원, 한광현 忠北大學校 農業科學硏究所 2014 農業科學硏究 Vol.30 No.2
Soil organic matter plays an important role in sustaining soil fertility due to its improvement of physical, chemical, and biological functions of soil. For external organic matter amended to provide those benefits, decomposition of the organic matter is the most important prerequisite, which is often done by soil microorganism and affected by numerous environmental as well as substrate-dependent factors. We have devised an advanced respirometer that can minimize fluctuations in soil environmental variables and measure precisely CO2 emission fluxes from organic matter-amended soils.Among examined green manure (barley, rye, hairy vetch, and milk vetch), barley and rye showed most high CO2 emission rates, regardless of their C/N ratios, which suggestsproportion of labile organic C and application dosewere the dominantcontrolling factors, rather than apparent C content and bulk C/N ratio. Similarly, the examined leguminous green manure, in spite of their high N contents, showed a significant lag time before active decomposition started.On the other hand, organic fertilizers examined (oil cake and animal-manure compost) emitted less CO2 than green manure. However, when these organic fertilizers were co-applied with green manure, their decomposition rates and associated microbial activity increased significantly. This synergetic enhancement can largely be explained by priming effect of boomed microbial population that utilize labile C pools of green manure, and partly by high contents of inorganic N in the organic fertilizers.