Pesticides (Brominal, Cuprosan and Fenvalerate) at 10 and 50 ppm suppressed growth, respiration and nitrogenase
activity of Azotobacter chroococcum, AzospiriIIum brasilense and Azospirillum ]ipos The inhibitory effect
on respiration of Asm. Iipoferum was most pronounced after 3 and 4 days.