The extensive applications of organophosphorous herbicides are nowadays integral part of modern agrotechnical methods due to their advantages for weeds control. Herbicides may negatively or positively interact with soil microorganisms and consequently reduce or increase their beneficial effects on soil fertility. The effect of herbicides on soil microorganisms varies with chemical composition and the susceptibility of different microorganisms. The observed increased biodegradation of pesticides after repeated application is due to the selection of pesticide degrading microorganisms....