Journal of FARM SCIENCES, Vol 21, No 1 (2008)

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Effect of Salt and Sewage Water on the Survival and Reproduction of Three Earthworm Species used in Vermicomposting

K. Dayananda, R.S. Giraddi, S.K. Gali

Abstract


An experiment was conducted in the laboratory to study the effect of salt and sewage water on the survival and development of three species of earthworms used in vermicomposting. Higher number of cocoons, non-clitellate and clitellate worms were observed in treatment with potable water followed by sewage water-potable water mixture (1:5 proportion). Water with RSC of < 2.5 MeL-1, EC of 2 dSm-1 and swage water-potable water (1:2 proportion) were moderate in their effect on the development of the worms. Direct application of sewage water adversely affected the worms resulting in to significantly lower number of cocoons, non- clitellate and clitellate worms. Whereas, water with EC of 8 dSm-1 and RSC of 10 meL-1 caused immediate mortality of the introduced worms indicating the toxicity of salt water on the three species of worms.

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