Influence of selected insecticides on enzyme activities in groundnut (Arachis hypogaea L.) soils.

The influence of acephate and imidacloprid on important soil enzyme activities, such as dehydrogenase and urease in two groundnut (Arachis hypogaea L.) soils, collected from Anantapur District of Andhra Pradesh, India, was studied under laboratory conditions. The activity of dehydrogenase, in terms of formazan formed from triphenyl tetrazolium chloride, was more pronounced in both soils treated with 2.5 kg ha of the acephate and imidacloprid. But higher concentrations (5.0, 7.5 and 10 kg ha) were toxic to dehydrogenase activity. The activity of urease in terms of ammonia formed from hydrolysis of urea was higher in both soils, treated with acephate and imidacloprid at 5.0 kg ha, but higher levels (7.5 and 10 kg ha) were toxic or innocuous to urease activity. _____________________________________________________________________________________________________________

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