In order to protect agricultural ecological environment and optimize the dosage of herbicides, 40% cyanamide acetochlor herbicide was used in this experiment to set up three different doses for treatment, in order to obtain the ideal effective dose for reduction. The results showed that 40% cyanamide acetochlor herbicide was reduced by 15% on the basis of conventional dosage, which had the same effect as the conventional dosage, the emergence rate was 91.53%, the control efficiency which the number of weeds...