棉田杂草种类多,危害重,常使棉花减产10%左右,严重时可达50%以上,为了提高棉田化学除草效果,必须正确掌握化学除草技术。一、土壤处理。在棉花播种后出苗前或营养钵移栽前施药,以禾本科杂草为主的棉田,用48%氟乐灵乳油,每亩100—150毫升,兑水25—30公斤,施于土表及时混土,除草效果可达90%,持效期40天以上;或用48%拉索乳油每亩150—200毫升,兑水25—40公斤处理土壤。禾本科杂草与阔叶杂草混生的棉田,可用40%地乐胺乳油每亩100—150毫升、兑水20—40公斤。播种后出苗前施于土表,随后用钉耙浅耙轻耙,药后30天除草效果90%;或用72% Cotton weed species, endanger heavy, often make the cotton cut about 10%, serious up to 50% above, in order to improve the cotton weed chemical effect, we must correctly grasp the chemical weeding technology. First, soil treatment. Pre-emergence after cotton sowing or nutrition bowl transplanting before spraying, weed-based cotton fields with 48% trifluralin, 100-150 ml per acre, watered 25-30 kg, applied to the soil Table timely mixing, weeding effect of up to 90%, holding period of 40 days or more; or with 48% corduroy 150-200 ml per acre, watered 25-40 kg of soil treatment. Gramineous weeds and broadleaf weed mixed cotton fields, available 40% toleramide EC 100-150 ml per mu, watered 20-40 kg. Pre-emergence sowing applied to the soil surface, followed by rake shallow rake rake light, 30 days after the herb weed effect of 90%; or 72%