Herbicide injury prevention: the use of technology master herbicide operating points. To be flat. Spraying precision farming plots to ensure that the floor leveling herbicide Xinxiang cotton fields, cotton fields Luoyang no big clods herbicide, no potholes. Drug on the carrier to mix evenly, spray or spread toxic soil should be uniform. Look growth of the seedlings, grass conditions, weather, soil. Herbicides Condition: antagonism. Antagonism refers to two herbicides herbicidal effect is less than the actual calculated based on the relevant model two herbicides alone herbicidal effects combined. Interaction judgment: According to the above definition of the different types of interactions, determine the type of interaction between herbicides Herbicides affect the calculation method of the combined effects of the theoretical value (correlation model) by.