우분에 깔짚 혼입 수준이 퇴비화 과정중 이화학적 성상 변화와 지렁이 생존에 미치는 영향
Effects of Mixing Ratios of Cow Manure and Stall Bedding on Physico-Chemical Characteristics and Earthworm (Eisenia foetida) Survival
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초록
The present study was conducted to provide basic data for environmentally friendly treatment of manure using vermicomposting by investigating the influence of physiochemical property change during the composting period on the survival of earthworms after mixing cow manure in different levels (0(CSD0), 10(CSD10), 20(CSD20), 30(CSD30), and 40%(CSD40)) with the sawdust that is used bedding in livestock pens. As composting proceeds, earthworms were able to survive in all treatments after 3 weeks. In terms of the C/N ratio by treatment groups, the sawdust mix treatment was significantly higher than the CSD0 treatment (p<0.05). The C/N ratio in the 3rdweek when earthworms started surviving was 23.26-61.05. As composting progressed, pH and electrolytic conductivity were highest in the CSD0 treatment and tended to decrease with higher proportion of sawdust in the mix. It was found that pH and electrolytic conductivity that earthworms starting to survive are 7.4-7.7 and 0.28-1.17 mS/cm respectively. To summarize, when composing cow manure with various levels of sawdust mix, all physiochemical property changes turned out to allow the survival of earthworms, but the results suggest that efficient vermicomposting requires the tests to examine growth and reproduction according to the sawdust mix ratio.
Abstract
The present study was conducted to provide basic data for environmentally friendly treatment of manure using vermicomposting by investigating the influence of physiochemical property change during the composting period on the survival of earthworms after mixing cow manure in different levels (0(CSD0), 10(CSD10), 20(CSD20), 30(CSD30), and 40%(CSD40)) with the sawdust that is used bedding in livestock pens. As composting proceeds, earthworms were able to survive in all treatments after 3 weeks. In terms of the C/N ratio by treatment groups, the sawdust mix treatment was significantly higher than the CSD0 treatment (p<0.05). The C/N ratio in the 3rdweek when earthworms started surviving was 23.26-61.05. As composting progressed, pH and electrolytic conductivity were highest in the CSD0 treatment and tended to decrease with higher proportion of sawdust in the mix. It was found that pH and electrolytic conductivity that earthworms starting to survive are 7.4-7.7 and 0.28-1.17 mS/cm respectively. To summarize, when composing cow manure with various levels of sawdust mix, all physiochemical property changes turned out to allow the survival of earthworms, but the results suggest that efficient vermicomposting requires the tests to examine growth and reproduction according to the sawdust mix ratio.
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