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轉基因抗蟲棉的源庫關係失調，突出表現在易早衰等問題由於抗蟲基因（Bt）的de導dao入ru，新xin的de抗kang蟲chong基ji因yin給gei棉mian株zhu帶dai來lai額e外wai的de生sheng理li消xiao耗hao，如ru植zhi株zhu的de棉mian鈴ling重zhong增zeng加jia而er葉ye源yuan和he根gen量liang均jun下xia降jiang，根gen係xi生sheng理li活huo性xing較jiao弱ruo，尤you其qi在zai結jie鈴ling後hou期qi，抗kang蟲chong棉mian根gen係xi生sheng理li活huo性xing全quan麵mian下xia降jiang，而er根gen係xi是shi整zheng個ge棉mian株zhu生sheng育yu健jian壯zhuang的de基ji礎chu，在zai根gen庫ku下xia降jiang的de同tong時shi，抗kang蟲chong棉mian株zhu地di上shang部bu庫ku器qi官guan的de活huo性xing可ke增zeng強qiang了le，如ru單dan株zhu成cheng鈴ling率lv高gao，結jie鈴ling較jiao早zao，內nei圍wei和he下xia位wei結jie鈴ling率lv高gao等deng，這zhe樣yang一yi來lai，由you於yu源yuan庫ku關guan係xi的de失shi調tiao，抗kang蟲chong棉mian普pu遍bian表biao現xian出chu易yi早zao衰shuai的de問wen題ti。另ling外wai，抗kang蟲chong棉mian在zai結jie鈴ling盛sheng期qi後hou的de碳tan氮dan代dai謝xie也ye出chu現xian失shi調tiao，在zai初chu花hua期qi和he盛sheng花hua期qi根gen係xi吸xi收shou力li還hai強qiang，表biao現xian氮dan素su代dai謝xie旺wang盛sheng，而er之zhi後hou，“根源”的de吸xi收shou，同tong化hua運yun輸shu功gong能neng的de降jiang低di，同tong樣yang要yao表biao現xian出chu早zao衰shuai現xian象xiang。可ke以yi說shuo，源yuan庫ku關guan係xi失shi調tiao是shi導dao致zhi抗kang蟲chong棉mian容rong易yi早zao衰shuai的de直zhi接jie原yuan因yin。根gen係xi功gong能neng的de過guo早zao降jiang低di和he碳tan氮dan代dai謝xie失shi衡heng是shi棉mian株zhu早zao衰shuai的de根gen本ben原yuan因yin。
抗(kang)蟲(chong)棉(mian)對(dui)鉀(jia)肥(fei)的(de)供(gong)應(ying)比(bi)較(jiao)敏(min)感(gan)在(zai)生(sheng)產(chan)中(zhong)農(nong)技(ji)員(yuan)和(he)棉(mian)農(nong)們(men)均(jun)已(yi)發(fa)現(xian)抗(kang)蟲(chong)棉(mian)比(bi)常(chang)規(gui)棉(mian)更(geng)容(rong)易(yi)出(chu)現(xian)缺(que)鉀(jia)症(zheng)狀(zhuang)，通(tong)過(guo)試(shi)驗(yan)證(zheng)明(ming)，在(zai)低(di)鉀(jia)水(shui)平(ping)時(shi)，抗(kang)蟲(chong)棉(mian)（如新棉99B）的幹物重顯著降低，而且降低的幅度比常規棉（如中棉所36、35）要多降50%～60%，kangchongmianduidijiamingandezhuyaoyuanyin，shigenxixingtaijixijianenglidejiangdi。suizheshengchanzhongzhuanjiyinkangchongmiandedamianjituiguang，gengjiazhonglemiantianquejiadexianzhuang。erqie，kejijiechuburenwei，quejiakenengshidangqianmianhuazaoshuaidezhongyaoyuanyinzhiyi。yinweijinnianlaideyixieshifeishiyanjieguobiaoming，jiafeigongyingchongzukeyiyanhuanyepiandeshuailao，youdeshiyanjieguohaizhengming，guanjianshiqigongjiachongzukeyishimianlingfayuqiyanchang25天左右，單鈴重增加0.2～0.5克。這說明合理施鉀肥可以防止棉花早衰。
鉀(jia)肥(fei)的(de)施(shi)用(yong)時(shi)期(qi)針(zhen)對(dui)施(shi)鉀(jia)可(ke)以(yi)緩(huan)解(jie)抗(kang)蟲(chong)棉(mian)的(de)早(zao)衰(shuai)問(wen)題(ti)而(er)有(you)利(li)於(yu)提(ti)高(gao)棉(mian)花(hua)產(chan)量(liang)，農(nong)業(ye)大(da)學(xue)化(hua)控(kong)研(yan)究(jiu)組(zu)又(you)進(jin)一(yi)步(bu)對(dui)鉀(jia)肥(fei)施(shi)用(yong)時(shi)期(qi)和(he)施(shi)用(yong)量(liang)的(de)分(fen)配(pei)等(deng)運(yun)籌(chou)問(wen)題(ti)進(jin)行(xing)了(le)探(tan)討(tao)，結(jie)果(guo)說(shuo)明(ming)，在(zai)施(shi)鉀(jia)量(liang)為(wei)6～8公斤K2O/mudeshuipingxia，liusuanjiadexiaoguohaoyulvhuajia，weilekefumianzhuzaoshuaiwenti，jiafeideshiyongshiqiyaofenjifeihezhuifeiliangcijinxing，erqie，zhuifeiyaoyanzhishenghuaqishijiaweiyi。liangcijiafeidefenpeibiliyi“40%基肥+60%追肥（盛花期追施）”為優。這種鉀肥施用時期上的“前輕後重”defenpeitedian，shizhenduiyanhuanzaoshuaiwentide，weilechongfenliyongjiayingyangdeshengligongneng，qianghuakangchongmianhouqiguanghechanwudehechengheyunshusuoshejide。qihelixingshitongguodaliangshiyanjieguodebijiaoershaixuanchulaide。zhezhongshijiajishuyuyiwangdebutong，zaijiafeiyunchoushangduijifeishijiadebizhongmingxiantiaoxiaole，jifeishijiazhizhan40%，而追肥施鉀的比重增加到60%，而且，將追施鉀肥的時期調晚到盛花期。如果回望一下，與以往高產棉花的施鉀分配有3方麵的不同點，一是施鉀量普遍提高了；二是基追鉀的比例是基肥輕、追肥重；三是追肥時期後延至盛花期，而過去高產棉花管理強調，追肥要在蕾期進行。
