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Relative toxicity of insecticides on growth, reproductive potential and biomolecules composition in earthworm (Eisenia foetida)
(CCSHAU, 2017) Sandeep; Dharambir Singh
The present study of 60 and 90 days was carried out to evaluate the nutrient status of vermicompost and the effect of two insecticides i.e., Phorate and Cartap on growth, reproductive potential and biomolecules composition of earthworm Eisenia foetida. Organic carbon reduced from 13.130% on zero day to 10.780% on 90th day so organic carbon decreased up to 17.89%. Nitrogen, phosphorus and potassium content increased up to 17.90%, 44.73% and 18.24%, respectively. C:N also decreased during up to 32.60% . During the present investigation it was observed that as the concentration and duration of exposure of earthworms to insecticides increased survival rate, cocoon production, juveniles production and reproductive potential of earthworm Eisenia foetida decreased. Maximum decrease was seen in earthworms reared in Cartap @ 2.0 mg/kg followed by worms reared in Phorate + Cartap @ 1.0 + 1.0 mg/kg. Maximum reduction in biomolecules i.e., 6.949% protein, 27.632% lipid and 2.000% carbohydrates was observed with Cartap (2.0 mg/kg) followed by 6.237% protein, 25.981% lipid and 1.410% carbohydrates in Phorate + Cartap (1.0 + 1.0 mg/kg). Among the two insecticides (Phorate and Cartap) under investigation, Cartap was found to have more toxic effect individually as well as in combination with Phorate.