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一封是雜草芽前封閉
苗床(chuang)(chuang)封閉時間選(xuan)(xuan)在棉(mian)花(hua)苗床(chuang)(chuang)播種(zhong)覆土后蓋膜前(qian)(qian)，可選(xuan)(xuan)擇的除(chu)(chu)草(cao)(cao)(cao)劑品種(zhong)和(he)用法(fa)：每667平(ping)方米可選(xuan)(xuan)用90%禾耐斯（乙草(cao)(cao)(cao)胺(an)）乳油40毫(hao)(hao)升～50毫(hao)(hao)升、或50%乙草(cao)(cao)(cao)胺(an)乳油75毫(hao)(hao)升～9o毫(hao)(hao)升、或48%拉索(suo)（甲草(cao)(cao)(cao)胺(an)）乳油150毫(hao)(hao)升～200毫(hao)(hao)升、或72%都爾乳油100毫(hao)(hao)升～200毫(hao)(hao)升、或24%果(guo)爾（乙氧氟草(cao)(cao)(cao)醚(mi)）12毫(hao)(hao)升一18毫(hao)(hao)升對(dui)水噴霧。大(da)田(tian)封閉視棉(mian)田(tian)類(lei)型而定，冬閑(xian)田(tian)雜草(cao)(cao)(cao)多而密(mi)，應在棉(mian)花(hua)移(yi)栽(zai)前(qian)(qian)20天～30天，結合(he)使用草(cao)(cao)(cao)甘膦或百草(cao)(cao)(cao)枯(ku)類(lei)除(chu)(chu)草(cao)(cao)(cao)劑防除(chu)(chu)冬季雜草(cao)(cao)(cao)，選(xuan)(xuan)用上述芽(ya)前(qian)(qian)除(chu)(chu)草(cao)(cao)(cao)劑混(hun)合(he)使用。對(dui)于有前(qian)(qian)茬(cha)作物的棉(mian)田(tian)，在前(qian)(qian)茬(cha)作物收獲(huo)后，立即選(xuan)(xuan)用上述芽(ya)前(qian)(qian)除(chu)(chu)草(cao)(cao)(cao)劑加20%百草(cao)(cao)(cao)枯(ku)類(lei)（如克無蹤、一把火(huo)）除(chu)(chu)草(cao)(cao)(cao)劑混(hun)合(he)噴施，此時最好不要用草(cao)(cao)(cao)甘膦類(lei)除(chu)(chu)草(cao)(cao)(cao)劑。
二殺是雜草苗后莖葉處理
①在未使用(yong)(yong)芽前除(chu)(chu)(chu)草(cao)(cao)(cao)(cao)(cao)(cao)劑(ji)(ji)處理(li)或(huo)(huo)遇到(dao)干旱天氣芽前處理(li)效果不(bu)理(li)想的棉(mian)花苗(miao)床(chuang)或(huo)(huo)大田(tian)，當(dang)雜草(cao)(cao)(cao)(cao)(cao)(cao)生長達到(dao)3葉期(qi)～6葉期(qi)時(shi)，進(jin)行莖葉處理(li)除(chu)(chu)(chu)草(cao)(cao)(cao)(cao)(cao)(cao)。苗(miao)床(chuang)或(huo)(huo)棉(mian)苗(miao)株(zhu)高(gao)(gao)不(bu)足35厘米(mi)的移(yi)栽(zai)(zai)大田(tian)，只(zhi)能使用(yong)(yong)對棉(mian)花安(an)全的選擇性除(chu)(chu)(chu)草(cao)(cao)(cao)(cao)(cao)(cao)劑(ji)(ji)除(chu)(chu)(chu)草(cao)(cao)(cao)(cao)(cao)(cao)。品種和用(yong)(yong)法：每667平方米(mi)用(yong)(yong)5%精禾草(cao)(cao)(cao)(cao)(cao)(cao)克(ke)乳(ru)(ru)油(you)4o毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)～60毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)、或(huo)(huo)10.8%高(gao)(gao)效蓋草(cao)(cao)(cao)(cao)(cao)(cao)能乳(ru)(ru)油(you)20毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)～30毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)、或(huo)(huo)15%精穩殺得乳(ru)(ru)油(you)4o毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)枷毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)對水(shui)15公(gong)(gong)斤～30公(gong)(gong)斤噴霧(wu)。②棉(mian)花蕾期(qi)且株(zhu)高(gao)(gao)在35厘米(mi)以上(shang)的移(yi)栽(zai)(zai)棉(mian)田(tian)除(chu)(chu)(chu)草(cao)(cao)(cao)(cao)(cao)(cao)技(ji)術(shu)：選用(yong)(yong)草(cao)(cao)(cao)(cao)(cao)(cao)甘膦類(lei)滅生性除(chu)(chu)(chu)草(cao)(cao)(cao)(cao)(cao)(cao)劑(ji)(ji)進(jin)行行間(jian)定(ding)向噴霧(wu)除(chu)(chu)(chu)草(cao)(cao)(cao)(cao)(cao)(cao)，每667平方米(mi)用(yong)(yong)41%草(cao)(cao)(cao)(cao)(cao)(cao)甘膦水(shui)劑(ji)(ji)（農達、農旺(wang)等）loo毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)～200毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)或(huo)(huo)10%草(cao)(cao)(cao)(cao)(cao)(cao)甘膦水(shui)劑(ji)(ji)450毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)～800毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)。施(shi)藥時(shi)要在噴頭上(shang)加防護罩，壓低噴頭，避免藥液漂移(yi)到(dao)棉(mian)花葉片上(shang)產生藥害(hai)。每667平方米(mi)用(yong)(yong)5%精禾草(cao)(cao)(cao)(cao)(cao)(cao)克(ke)乳(ru)(ru)油(you)60毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)～80毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)+90%禾耐斯(si)乳(ru)(ru)油(you)60毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)、或(huo)(huo)5%精禾草(cao)(cao)(cao)(cao)(cao)(cao)克(ke)乳(ru)(ru)油(you)60毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)～80毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)加10%乙羧(suo)氟草(cao)(cao)(cao)(cao)(cao)(cao)醚20毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)～30毫(hao)(hao)(hao)(hao)升(sheng)(sheng)(sheng)(sheng)對水(shui)30公(gong)(gong)斤噴霧(wu)。此時(shi)期(qi)行間(jian)定(ding)向除(chu)(chu)(chu)草(cao)(cao)(cao)(cao)(cao)(cao)慎用(yong)(yong)百草(cao)(cao)(cao)(cao)(cao)(cao)枯類(lei)除(chu)(chu)(chu)草(cao)(cao)(cao)(cao)(cao)(cao)劑(ji)(ji)，否則棉(mian)苗(miao)容易產生藥害(hai)。
三補是棉花大田花鈴期補施除草劑
對于田間零星的雜草(cao)，可(ke)以選用滅生性(xing)除(chu)草(cao)劑草(cao)甘(gan)膦類，采取(qu)點片(pian)結合的方(fang)法補施除(chu)草(cao)劑，用法同蕾期施用方(fang)法，用量視面(mian)積大小而定。