At present, chemical herbicides have been generally accepted and applied, and it is considered that the herbicides are used in a small amount, quick in effect, labor saving, and cost-saving. However, there are many kinds of herbicide products, and there are pre-treatment agents, post-emergence pre-treatment agents, and seedlings. Post-treatment agents, different herbicides should be applied at different times.
Pre-sow treatment agent: refers to the process of sealing the soil before planting, such as the use of trifluralin in cotton fields and the use of wild wheat in wheat fields. The herbicides are sprayed into the soil before sowing in cotton or wheat, and mixed into the soil. It has a certain depth to absorb the weed roots and shoots, and can prevent or reduce the volatilization and photolysis loss of the herbicide.
Pre-emergence treatment agent after sowing: soil treatment before emergence of crops after sowing. This method is mainly used for weeds and young leaves to absorb herbicides that are transmitted to growth points, and is safe for crop shoots.
Post-emergence treatment agent: refers to spraying the herbicide directly onto the weed plant after the emergence of the weed. Some herbicides such as paraquat and glyphosate can be eliminated in the middle and late stages of weed growth. Herbicide is generally a herbicide that is absorbed by stems and leaves and can be transmitted to Other parts of the plant.
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