먹이조건의 차이가 지렁이 생육, 분립생산량 및 체조직으로의 유기물 전환효율에 미치는 영향

The Effects of Different Feeding Conditions on Growth, Cast Production and Conversion Efficiency of Organic Matter to the Earthworm(Eisenia foetida L.)

우분에 왕겨와 볏짚을 1:1, 1:2, 1:3의 부피비율로 혼합한 먹이조건이 지렁이의 생육, 분립생산량, 체조직으로의 유기물 전환율 및 전환효율을 조사하여, 적정 먹이조건을 추정하였다. 1. 우분+왕겨 혼합구가 우분+볏짚 혼합구보다 지렁이의 증체속도, 증식효율 및 분립생산량이 많았다. 특히 우분+왕겨 1:3 혼합비율이 지렁이 생육에 가장 알맞은 먹이조건이었다(Table 2). 2. 우분+왕겨 혼합 구에서 지렁이 체조직으로의 유기물 전환율과 전환효율이 높았던 것은 먹이 중의 휘발성 고형분과 전탄소함량이 높았기 때문이었다(Table 1, 4). 4. 지렁이 분변토는 약알칼리성이고, 전질소함량, 유효인산함량, CEC 및 치환 성 양이온 함량이 높아서 친환경 농자재로 유용하게 활용될 수 있다고 판단된다(Table 5).

This experiment was carried out to investigate the effect of different feed conditions on growth, cast production and conversion efficiency of organic matter to the earthworm. The experiment was tested on cow manure(CM) mixed with rice hulls (RH) or rice straw(RS). The mixture ratios were designed as one time, two times and three times of cow manure volume, respectively. The CM and RH mixtures resulted better on growth rate, reproductive efficiency and wormcast production than those for CM and RS mixtures. Especially on three times of RH mixture showed the highest growth characteristics compared to the other mixtures. Although both were between 20 and 34 on carbon and nitrogen ratio, the result inferred that the difference on the growth might have been caused by feeding conditions. On the mixtures of cow manure with rice hulls(CM+RH) was significantly higher on values on the conversion rate and conversion efficiency of organic matter to earthworm tissues than the mixtures of cow manure with rice straw(CM+RS). The most concerned point of the mixture of earthworm feed is that high contents of volatile solid and total carbon that increases in conversion efficiency of organic matter to earthworm tissues, and also causes the increase in growth rate and reproductive efficiency. The wormcast could be used as a valuable plant growth medium or soil conditioner for sustainable agriculture and it may be due to their high qualities of physico-chemical properties.