目前上海郊区采用三种育苗方式,即河泥育苗,营养钵育苗和方格熟土育苗。棉花育苗移栽,可早播早发,延长有效开花结铃期;能培育壮苗,保证密度,通过蹲苗,较易控制蕾期稳长。一般比直播棉花增产1—2成。但是掌握不好,就达不到预期效果。当前在育苗移栽方面还存在一些问题:一是苗床成苗率不高,死苗比较严重。种子质量差,苗床整地粗放,床土湿度过大,尤其是棚内温度掌握不当,温差过大,导致死苗。二是蹲苗时间过长,一般移栽后10天左右开始缓苗(活棵),但不少社队移栽后蹲苗时间长达一个多月,早苗得不到早发(见编者注)。三是晚茬移栽太晚, At present, Shanghai suburb adopts three kinds of nursery methods, namely river nursery, nutrition nursery and box breeding. Cotton seedling transplanting, early sowing early, to extend the effective flowering period; can grow strong seedlings, to ensure density, through the squat seedlings, easier to control the buds of the long term. Generally 1-2% more than direct broadcast cotton. But mastery is not up to the expected results. At present, there are still some problems in transplanted seedlings: First, seedling into the seedling rate is not high, dead seedlings more serious. Poor seed quality, extensive seedbed preparation, bed soil humidity is too large, especially in the greenhouse temperature mismanagement, the temperature difference is too large, leading to dead seedlings. Second, squatting seedling time is too long, generally about 10 days after transplanting began to Huanmiao (live tree), but many commune squatting seedlings after transplanting for up to more than a month, early seedling not get early (see editor’s note). Third, late crop transplanting too late,