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Soil blocking before sowing can be done with 48% trifluralin EC 100 to 150 ml (used per acre, the same below), 48% dimethoamine EC 200 ml, 33% herbicide EC 100 to 150 ml, 50% acetochlor Emulsifiable concentrate 75 to 150 ml, spray 50 kg of water separately. Trifluralin is easy to photolyze and volatilize, reducing the efficacy of the drug, and immediately after the spray is applied to the soil 2 to 3 cm. These herbicides have better control effects on barnyardgrass, green foxtail, and tendongrass, and have certain control effects on broad-leaved weeds such as barnyardgrass, earthworms, and mussels.