Effects of Mixture Ratios of Cow Manure and Sawdust on the Growth of Earthworm(Eisenia foetida) and Cast Production

우분에 톱밥 혼합 수준이 지렁이의 생육과 분립 생산에 미치는 영향

This study was conducted to develope efficient vermicomposting using of different mixture ratios of cow manure and sawdust by feeding these to earthworm and then by studying the growth and reproductive efficiency of earthworm, and the chemical composition of worm cast and its production. The results are summarized as follows. C/N ratio of feed was $20.43{\sim}45.20$ and it increased according to the higher proportion of sawdust, and survival of earthworm was $97.6{\sim}100%$. Number of young worms were significantly higher in 30 and 40% addition of sawdust (number of 899.6 and 927.8) than number of 769 of real cow manure treatment (P<0.05). Fresh weight of young worms was $8.00{\sim}14.35g$ and it was significantly higher in 40% addition of sawdust than other treatments(P<0.05). The cast production of earthworm was showed in the tendency of becoming lower in the 40% addition of sawdust than in $10{\sim}30%$ addition of that, but digested matters were significantly higher in $10{\sim}40%$ addition of sawdust than real cow manure treatment(P<0.05).

본 실험에서는 우분과 톱밥의 혼합수준을 달리하여 지렁이 먹이로 이용하였을 때, 지렁이 생육과 증식에 미치는 영향과 지렁이 분립의 생산량 및 화학적 조성을 조사하여 우분의 효율적인 Vermicomposting의 기초자료로 이용하고자 실시하였다. 그 결과를 요약하면 다음과 같다. 먹이의 탄질율은 $20.43{\sim}45.20$으로 톱밥 혼합 수준이 증가함에 따라 탄질비도 높아졌으며 실험기간 동안 지렁이의 생존율은 $97.6{\sim}100%$로 나타났다. 산자수는 톱밥을 30과 40% 혼합한 구에서 각각 899.6과 927.8 마리로 우분 100%구의 769 마리보다는 유의하게 높게 나타났다(P<0.05). 산자중은 $8.00{\sim}14.35g$으로 톱밥 혼합 수준이 높을수록 유의하게 높아져 톱밥 40% 혼합구가 가장 높았다(P<0.05). 지렁이 분립생산은 톱밥 혼합 수준이 높을수록 낮게 나타났으며 소화량은 이와는 반대로 톱밥 혼합 수준이 높을수록 유의하게 높게 나타났다.