As broad-leaved weeds and broad-leaved vegetables belong to the same dicotyledonous plant, shoots (seedlings) are used to pre-treat broadleaf weeds. If there are more weeds before planting, we should first treat the big grass in the field with herbicides such as paraquat and glyphosate. After the weeds die, we must prepare the soil again. In order to effectively prevent the fields from being harmed by weeds, they should be sown immediately or transplanted. At this time, weeds can be controlled by pre-emergence treatment. The use of pesticides to prevent broad-leaved weeds after emergence and colonization of vegetables depends on the circumstances. If the seedlings and weeds grow without obvious boundaries in the field, they are mixed together and generally can only be removed manually. If weeds are mainly grown in rows or in furrows in vegetable cultivation, weed herbicides can be used (such as paraquat).
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