kongzhifeishui。jinruyuji,mianhuajichangzhiyeyouzengleijieling,duifeishuidexuqiudadaogaofeng,yingshishizhuifei,jinfangtuofeizaoshuai。danyouyuyujiyushuixiangduipianfeng,jiliyugezhongfeixiaodefahuierdaozhimianzhuwangchang、瘋長。因而,在追肥的同時還應做到:1.對底肥充足、苗肥量大的棉田應少施或不施,並注意清溝瀝水,謹防漬澇。2.對棉株發育遲緩,紅莖到頂,葉小色黃的棉田宜早施並加大肥料用量,如尿素用量每畝可在8公斤左右。另外,若發生連續幹旱,土壤含水量低於田間持水量的60%時,應適時隔溝補水。
shiqihuakong。jinruyujihou,mianzhujiyifashengfengchang,yinqileilingtuoluo,erjishiyongsuojieanhuozhuzhuangsuhuakongkewendingmianzhushengchang,gaishanzhuxing,duozengleijieling。qifangfashi:雨季初期棉花初開花時,每畝用助壯素6-8毫升或縮節胺1.5-2克,對水30-40公斤,全田噴施。進入雨季中期,約在7月底8月初,可畝用縮節胺原粉3克左右,對水40-50公斤噴施。
勤(qin)整(zheng)枝(zhi)打(da)頂(ding)。由(you)於(yu)雨(yu)季(ji)棉(mian)株(zhu)生(sheng)長(chang)加(jia)快(kuai),其(qi)贅(zhui)芽(ya)也(ye)易(yi)發(fa)生(sheng)。因(yin)而(er),應(ying)於(yu)雨(yu)停(ting)間(jian)隙(xi)及(ji)時(shi)人(ren)工(gong)抹(mo)掉(diao)。當(dang)棉(mian)株(zhu)長(chang)到(dao)預(yu)定(ding)的(de)株(zhu)型(xing)高(gao)度(du)時(shi),為(wei)打(da)破(po)和(he)抑(yi)製(zhi)頂(ding)端(duan)優(you)勢(shi),減(jian)少(shao)上(shang)部(bu)無(wu)效(xiao)果(guo)枝(zhi)對(dui)養(yang)分(fen)的(de)無(wu)謂(wei)消(xiao)耗(hao),促(cu)進(jin)棉(mian)鈴(ling)發(fa)育(yu)等(deng),應(ying)適(shi)時(shi)(約在7月中下旬)打頂。
科ke學xue治zhi蟲chong病bing。各ge種zhong病bing蟲chong害hai的de發fa生sheng與yu否fou,和he雨yu季ji雨yu量liang狀zhuang況kuang關guan係xi極ji大da。如ru若ruo幹gan旱han就jiu不bu利li於yu棉mian鈴ling蟲chong卵luan的de孵fu化hua和he幼you蟲chong發fa育yu,但dan降jiang水shui多duo雨yu量liang大da也ye會hui阻zu礙ai其qi卵luan的de孵fu化hua,尤you其qi是shi暴bao雨yu對dui蟲chong卵luan及ji初chu孵fu幼you蟲chong有you較jiao強qiang的de衝chong刷shua作zuo用yong。倘tang若ruo雨yu季ji降jiang水shui少shao而er均jun勻yun,則ze利li於yu棉mian鈴ling蟲chong暴bao發fa流liu行xing。然ran而er,若ruo雨yu季ji降jiang水shui少shao、幹旱嚴重,則利於紅蜘蛛繁衍危害。相反,若雨季出現連續陰雨,棉株旺長,瘋長嚴重,且田間排水不良,棉株極易患枯、黃萎病,同時又引發爛鈴病出現等。因此,棉花病蟲害的防治,應結合雨季的天氣情況,合理選擇農藥,科學防治,方能事半功倍。
適防自然災害。進入雨季是諸如幹旱、漬澇、冰雹、dafengdengzaihaideyifaqi,zaijiaqiangfangyudejichushang,haiyingduiwufakangjudezaihai,caiqucuoshijiayiwanjiu,yijianqingweihai。ruduiyubingbaoweihaihoudemiantianyingjishijiaoshuizhuifei,cuqijinkuaihuifushengji;其次是及時整枝打頂、化控,並注意防治病蟲害。對於受澇災後的棉花,一是及早清理、疏通排水係統,排除積水;其次是中耕鬆土,增施肥料,防止脫肥旱衰。
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