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日平均气温可稳定通过10℃时(丹东地区一般在4月20日左右)覆膜育苗床内的温度在35℃以上的时间每天可持续3～4小时,为防止烟苗生长嫩弱,抗逆性降低,应及时揭膜炼苗.炼苗可以使烟草根系发达,抑制徒长,提高移栽成活率.
The average daily temperature can be stabilized at 10 ℃ (Dandong area generally around April 20) lamination seedbed bed temperature above 35 ℃ for 3 to 4 hours a day, in order to prevent the growth of weak, weak seedlings Inverted sexual decline, it should promptly expose the film hardening. Hardening can make the tobacco roots developed to curb leggy and improve the survival rate of transplanting.