Herbicide technique: contact toxicity herbicide. Such herbicides only harm the plants exposed to the agent site MCPA salt factory, 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 the roots, stems and leaves wholesale MCPA sodium salt, and quickly transmitted to the whole plant, which kill harmful plants. Herbicide technique: strict herbicide methods. The use of herbicides have foliage treatment, soil treatment and herbicide film weeding method. The most commonly used method is foliar and soil treatment after sowing seedling growth period. Growth of foliage treatment, is in a growth phase after crop emergence, the spraying of herbicides on weed stems and leaves of the method.