棉花在利用塑料薄膜育苗过程中,有时在揭膜以后出现子叶萎蔫下垂,轻则在盖膜以后自然恢复,重则造成子叶干枯脱落,这种现象群众称为棉苗“晒秧”。棉苗“晒秧”是怎样发生的呢?客观因素与用塑料薄膜复盖有关,主观因素是苗床管理工作中通风掌握不好造成的。塑料薄膜复盖苗床的特点是增温快、保温 Cotton in the use of plastic film nursery process, sometimes after cotyledons withering drooping, ranging from the natural recovery after the cover film, while causing the cotyledons dry off, this phenomenon is called the cotton seedlings “sun seedlings.” Cotton seedling “sun seedling” is how it happened? Objective factors and covered with plastic film, subjective factors is the seedbed management work caused by poor ventilation. Plastic film covered seedbed is characterized by rapid warming, thermal insulation