Herbicide Classification: classification based on chemical structure. Foliar treatment agent: the herbicide solution watered, with small droplets evenly sprayed on plants such herbicide spraying method used is called foliar treatment agent. Soil treatment agent: the herbicide sprayed on the soil evenly shaped in a certain thickness of the drug layer, when the shoots of weed seeds, seedlings and roots are contacted absorbed and play a role in the cotton fields of herbicide to kill the grass wholesalers, which kind of action herbicides cotton fields herbicide manufacturers, called the soil treatment agent. Improve herbicide effect: Choose the best time spraying. The herbicidal properties herbicide wholesale cotton fields, weeds occurrence period, weeds and crop growth period, medication suitable period selected. Many cotton fields herbicides herbicides, have foliage treatment, soil treatment agent, toxicity herbicides Herbicide, and some apply a pre-emergent weed control, and some apply to leaf weed.