Herbicide technique: contact toxicity herbicide. Such herbicides only harm the plants exposed to the agent site, had no effect on the site are not exposed to the agent. The uptake and type of weed type. Such herbicide active ingredient can be absorbed by plant roots, stems, leaves MCPA sodium wholesalers, and quickly transmitted to the whole plant, which kill harmful plants. 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.