目前辽宁省水稻育苗覆盖材料主要是聚乙烯塑料薄膜，即通常所说的农膜。用农膜做覆盖材料的苗床内昼夜温差大，温度变化剧烈，因而必须进行人工通风炼苗，但操作过程既繁琐费工费力，又很难准确把握操作尺度，常因控制不住温度，导致秧苗滞长或徒长，给培育壮秧带来很大困难。 At present, Liaoning province rice seedling covering material is mainly polyethylene plastic film, which is commonly referred to as plastic sheeting. Cover with plastic sheeting made of seedbed temperature difference between day and night, the temperature changes violently, which must be artificial aeration Lianmiao, but the operation is complicated and laborious effort, it is difficult to accurately grasp the operating scale, often unable to control the temperature, resulting in Seedlings stagflation or leggy, to cultivate strong seedlings bring great difficulties.