Effect of pesticides on earthworm population dynamics in two ecologically different land use systems of Uttarakhand, India

Ms Rashi Miglani1, Dr Satpal Singh Bisht2

1Kumaun University, Nainital, India, 2Kumaun University, Nainital, India

Earthworms Density and Soil Organic Matter are the two prime aspects of soil ecology which include dynamics of soil properties in terms of nutrients porosity aeration water holding capacity humification and distribution, dispersal and decomposition of soil organic matter generated from various sources. The external inputs in agricultural lands such as fertilizers, and pesticides are likely to increase crop production but it comes at the cost of soil degradation. Earthworm population creates nutrient rich biocover but high precision of pesticides application and exhaustive rotation of pesticides in soil disturbs dynamics of earthworms population. To parameterize the toxic effect of pesticides on earthworm an acute toxicity test of Chemical (Emamectin Benzoate) was performed using a contact filter paper method proposed by OECD (Organization for Economic and Cooperative Development) testing guideline 2016 and earthworm population dynamics were studied for two consecutive years in two different land use systems. In contact filter test the worms were exposed to different concentration of insecticide for 48 h and mortality was recorded and LC50 for Emamectin benzoate i.e. 22.90 μg/cm2 found to be very toxic to earthworm Metaphire posthuma.

Keywords: LC50, Emamectin benzoate, Population Dynamics, Insecticides


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