Weeds and wheat are all plants. Herbicides have a limited selectivity. We must ensure that herbicides kill both weeds and wheat, and we must strictly control the amount of herbicides. We must not arbitrarily increase or decrease the amount of herbicides. The amount introduced in the manual should be used and local conditions should be adopted. Soil with high organic matter content and fine soil particles has a large amount of herbicides adsorbed thereon, and the amount of soil microorganisms is large and activities are vigorous. The pesticides are degraded more and the application amount should be increased. The sandy loam particles are relatively large, and the adsorption capacity of the pesticide is relatively small. The drug molecules are mostly in the free state among the soil particles, and have strong activity, are prone to phytotoxicity, and the dosage can be appropriately reduced. Herbicides are more stable in alkaline soils, are not easily decomposed, have a long residual effect period, and are prone to produce phytotoxicity to the crops. Therefore, the application time should be as early as possible in alkaline soils and be used with caution.
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