1、適期化控:進入雨季後,棉株極易瘋長,引起蕾鈴脫落,及時用縮節胺或助壯素化控可穩定棉株生長,改善株形,多結蕾鈴。方法是: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,加水25-28公斤噴霧。雨季中期(約7月底8月初),每畝用縮節胺3克左右,加水30-40公斤噴施。噴施縮節胺要求每株頂部和果枝頂部著藥均勻,水量少,以不滴水為準。一般在下午3時以後或上午10時以前噴施,以防高溫蒸發。噴後遇大雨應補噴,用量減半。
2、控製肥水:jinruyuji,mianzhujichangzhiyeyouzengleijieling,duifeishuideyaoqiudayishenggaofeng,yingshishizhuishifeiliao,fangzhituofeizaoshuai。yujiyushuichongzu,youliyugezhongfeiliaofahuifeixiao,daozhimianzhuwangchang、瘋長。對底肥充足,苗肥量大的棉田,應少施或不施肥料,並注意清溝瀝水,嚴防漬澇;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,如尿素用量為每畝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%,應適時灌水。
3、去贅芽打頂心:yujimianzhushengchangkuai,zhuiyayeyifasheng。yutingjianxiyingjishijiangzhuiyamodiao。mianzhuchangzhiyudingzhuxing,youyudingdeguozhishushi,weidapoheyizhidingduanshengchangyoushi,jianshaoshangbuwuxiaoguozhiduiyangfendexiaohao,cujinmianlingfayu,yingshishi(約7月中下旬)打頂。
4、防治病蟲害:各種病蟲害的發生與否,和雨季雨量狀況關係極大。幹旱不利於棉鈴蟲卵的孵化和幼蟲發育,降水多、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。若ruo雨yu季ji降jiang水shui少shao而er均jun勻yun,則ze有you利li於yu棉mian鈴ling蟲chong暴bao發fa。雨yu季ji降jiang水shui少shao、幹gan旱han嚴yan重zhong,有you利li於yu紅hong蜘zhi蛛zhu繁fan衍yan危wei害hai。雨yu季ji出chu現xian連lian續xu陰yin雨yu,棉mian株zhu瘋feng長chang且qie嚴yan重zhong,田tian間jian排pai水shui不bu良liang,極ji易yi發fa生sheng枯ku黃huang萎wei病bing,也ye容rong易yi出chu現xian爛lan鈴ling。棉mian花hua病bing蟲chong害hai的de防fang治zhi,應ying結jie合he雨yu季ji的de天tian氣qi和he病bing蟲chong害hai發fa生sheng情qing況kuang,合he理li選xuan擇ze農nong藥yao。
5、及時應對自然災害:進入雨季後,幹旱、澇漬、冰雹、大da風feng等deng災zai害hai極ji易yi發fa生sheng,要yao在zai加jia強qiang防fang禦yu的de基ji礎chu上shang,對dui無wu法fa抗kang拒ju的de災zai害hai,及ji時shi采cai取qu措cuo施shi加jia以yi挽wan救jiu,以yi減jian輕qing危wei害hai。雹bao災zai發fa生sheng後hou應ying及ji時shi灌guan水shui施shi肥fei,促cu進jin棉mian花hua盡jin快kuai恢hui複fu生sheng機ji,並bing及ji時shi整zheng枝zhi打da頂ding、化控,防治病蟲害。受澇災後,及時清理、疏通排水係統,排除積水;及時中耕鬆土,增施速效肥,防止脫肥早衰;適時防治病蟲害。
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