The effect of two concentrations of aldicarb and endosulfan was evaluated through the dilution in series and urease activity methods. Aldicarb was inhibitory to actinomycetes at 2 ppm, but caused a slight stimulation at 20 ppm. A stimulation on the actinomycete population was also observed at 2 and 20 ppm of endosulfan. Aldicarb was inhibitory to bacteria in both concentrations but, on the other hand, endosulfan caused stimulation of bacteria and fungi populations; aldicarb was found to have no effect on fungi number. The protozoa were drasticaly affected by both insecticides. The results have shown that both insecticides had no effect on urease activity.
aldicarb; endosulfan; microorganisms; urease