Summer sesame seedlings season coincides with high temperature and rainy season, with less roots and weak growth. However, weeds are unearthed quickly, with high density and strong growth, and it is easy to cover the sesame seedlings to form grassland. The corresponding herbicides should be used at different times for removal.
First, the closed soil before seedling treatment. After sowing with sesame seed, use 50% acetochlor EC 100ml or dole (72% metolachlor EC) 200ml water and 50kg evenly to spray, which can control green foxtail, crabgrass, maiden, goosegrass, etc. A variety of annual grass weeds also have certain control effects on broad-leaved weeds that are propagated by a variety of small seeds. Keep the soil moist after the medicine. It is not suitable to loosen the soil in 50 days to avoid destroying the soil layer.
Second, the use of herbicides. Summer weedy field weeds generally emerge 3-10 days earlier than sesame seeds, and grow rapidly, can fully use this period of time before the emergence of sesame, use paraquat to control unearthed weeds, with 20% paraquat per acre agent 200 Add 40 kg of water to the spray. The drug is a contact-killing herbicide that can be quickly absorbed by the plant leaves after the drug, so that photosynthesis and chlorophyll synthesis are quickly terminated. The leaves begin to change color within 2-3 hours after the drug is applied, but they cannot be transmitted, and therefore can only be affected. The drug is partially victimized. The contact between the drug and the soil is inactive and has no residue, and has no effect on the emergence of sesame.
Third, after the emergence of selective herbicides. After the emergence of sesame, weed 2-3 leaf stage, can be used per acre with refined grass gram (5% quizalopyr EC) 70-100 ml or fine stable to kill (15% fluazifop-mercury) 50 Add 40 kg of water to the spray. 4-5 days after the drug, the symptoms of weeds appear yellow and internode browning poisoning. After 7-8 days, the whole plant died. The main prevention and control of wild oats, crabgrass, goosegrass, Acacia, Setaria, Qianjin, etc. Annual grass weeds.
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