一、butongpinzhongdemianzhongzaitongyimiaochuangshangbozhongchumiaoyouchiyouzao
，shengchanshangjingchanghuichuxian，bunengyouciduandingchumiaochidepinzhongzhongzizhiliangcha。zheshiyinweibutongpinzhongbozhongzhichumiaoduihuodongjiwen（等於或大於　10℃　持續期內的日平均氣溫的累積值）的要求不一樣
，有的品種在活動積溫達　80℃　時就可以出苗，有的品種要求活動積溫達　100℃　才(cai)能(neng)出(chu)苗(miao)。另(ling)外(wai)，不(bu)同(tong)品(pin)種(zhong)的(de)棉(mian)種(zhong)種(zhong)殼(ke)厚(hou)薄(bo)程(cheng)度(du)有(you)差(cha)異(yi)，吸(xi)收(shou)水(shui)分(fen)的(de)速(su)度(du)也(ye)有(you)差(cha)異(yi)。不(bu)同(tong)品(pin)種(zhong)的(de)棉(mian)種(zhong)最(zui)好(hao)不(bu)要(yao)在(zai)同(tong)一(yi)苗(miao)床(chuang)播(bo)種(zhong)
，以(yi)便(bian)一(yi)播(bo)全(quan)苗(miao)。　　 

    二、xiangtongpinzhongdemianzhongzaitongyimiaochuangshangchumiaoyouhaoyoucha，duoyubozhongqianhouyingyangbotudeshirunchengduyouguan。yibanjiaoshuijiaozu
，nengmanzumianzhongfayasuoxushuifendemiaochuangchumiaojiaohao
，ertongyimiaochuangshangjiaoshuibujunyun，chumiaojiuhenbuyiyang。zaijiaoshuibuzudemiaochuang
，changchangpengmoliangcechumiaojiaohao，zhongjianchumiaojiaocha。zheshiyinweipengmoshangdeshuizhengqiningjuchengshuizhuhouyanzhepengmoliuruliangcedeyingyangbozhong

，shizhebufenmianmiaoxishuijiaozu，ermiaochuangzhongjiandeyingyangboxishuijiaoshao。yinci，bohoumiaochuangyaoyicijiaozushui

，cujinqimiao
，miaobuchuqibujiekaisuliaobomo。　　 

    三、 棉花苗床發生爛種，通常有三方麵原因。一是種子質量不高，特別是破籽和嫩籽播後易爛種
；二是用尿素作底肥，種子萌動後胚芽受灼傷易爛種；三是澆水過量。苗床發生死苗的原因，主要有生理失調、肥料濃度過高、病菌侵染、低溫冷害、高溫熱害等，要根據實際情況具體分析。預防棉花爛種死苗
，一是要購買發芽率高的棉種

，剔除破籽和嫩籽；二是要用腐熟有機肥或適量複合肥作底肥，不能施用尿素；三是水分管理要適度；四是搞好缽土、蓋籽土的消毒；五是棉苗子葉展開後要立即噴施殺菌劑，防止病菌侵入。　　 

    四
、棉花苗床常出現的畸形苗有帶殼苗
、翹腳苗、胖腳苗、suoyemiaodeng。daikemiaoyibanshijiaoshuibuzu，ziyeweinengchongfenpengzhangtuichumiankezaochengde
，buchongshuifenhouziyeshenzhanjiunengtuoke。qiaojiaomiaoshibohoufutuguoboyinqide
，tongchangfutuhoududa1.5厘li米mi就jiu可ke以yi避bi免mian出chu現xian。胖pang腳jiao苗miao是shi播bo後hou覆fu土tu過guo深shen造zao成cheng的de
，幼you苗miao為wei了le出chu土tu而er將jiang養yang分fen集ji中zhong向xiang幼you莖jing基ji部bu輸shu送song
，使shi幼you莖jing肥fei大da
，隻zhi要yao覆fu土tu厚hou度du適shi中zhong就jiu能neng避bi免mian出chu現xian。縮suo葉ye苗miao除chu蚜ya蟲chong危wei害hai導dao致zhi外wai，一yi般ban是shi真zhen葉ye受shou凍dong的de表biao現xian
，幼you苗miao出chu齊qi後hou遇yu寒han潮chao要yao提ti早zao蓋gai嚴yan薄bo膜mo。