Korean Journal of Organic Agriculture (한국유기농업학회지)

Korean Association of Organic Agriculture (한국유기농업학회)
권호 표지

Estimation of Optimal Stocking Rate of Earthworm Populations

지렁이 개체군의 최적 사육밀도 추정

  • Received : 2012.07.24
  • Accepted : 2012.09.18
  • Published : 2012.09.28
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Abstract

This experiment was carried out to investigate the optimal stocking rate of earthworm populations grown under different stocking rates. The stocking rate in terms of ratio of biomass of earthworms to biomass of feeds(organic resources) is an important factors for biomass productivity of earthworms and vermicast production. The different stocking rates were 1:16(S-1), 1:32(S-2), 1:48(S-3) and 1:64(S-4), as the ratios of biomass of earthworm to biomass of organic dairy cow manure, respectively. The stocking rate of 1:32(S-2) and 1:46(S-3) were obtained a higher values on increasing rates and conversion efficiency of organic matter to earthworm biomass than other stocking rates. Thus, a stocking rates of 1:32 and 1:46 estimated an optimal stocking rates for maximum biomass productivity of earthworms. A stocking rate of 1:16(S-1) showed a significantly highest values of vermicast production and ratios of vermicasts during the rearing periods.($$P{\leq_-}0.05$$) A stocking rate of 1:48(S-3) showed a highest values of the number of cocoons and vermicasts production per earthworm biomass among the treatment ($$P{\leq_-}0.05$$) The contents of nitrogen, available phosphorus, cation exchange capacity and exchangeable cations of vermicasts tended to increase with stocking rate and rearing progressed. Vermicasts have a great deal of potential for crop production and protection in sustainable organic cropping systems.

사육밀도를 달리 했을 때 지렁이 개체군의 생체량 증가를 위한 최적 사육밀도를 추정하려고 하였다. 실험결과를 요약하면 다음과 같다. 1. 사육밀도 S-2과 S-3에서 상대증체량, 생체중 증가율과 유기물 전환효율이 높은 값을 나타내어, 지렁이 개체군의 최대 생체량을 얻기 위한 최적 사육밀도로 추정되었다. 이를 지렁이 생체중과 먹이량의 비율로 나타내면 1:32-1:48의 범위였다. 2. 사육밀도 S-1(1:16)에서 모든 조사시기의 분립생산량이 유의하게 많았고 분립비율도 유의하게 높았다($$P{\leq_-}0.05$$). 3. 사육밀도 S-3(1:48)에서 지렁이 생체중당 난포수와 분립생산량이 가장 많았다($$P{\leq_-}0.05$$). 4. 사육밀도가 높아지고 사육기간이 길어짐에 따라 분립의 전 질소함량, 유효인산함량, 양이온치환능력(CEC) 및 양이온 함량이 증가되는 경향이었다. 5. 유기농업에서 지렁이 분립은 상토 재와 토양개량제 및 작물보호를 위한 농자재로서 잠재적 유용성은 매우 높다고 판단된다.

Keywords

References

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