以早稻品种中嘉早17为试验材料，研究了叠盘出苗低温炼芽对薄膜覆盖育秧和露天育秧早稻秧苗素质的影响。结果表明，露天育秧下，相比不经低温炼芽的处理，低温炼芽处理的秧苗成苗率增加8.8%，秧苗素质也更高，其中，露天育秧15 d和30 d秧苗的叶绿素含量分别增加8.7%和37.1%，秧苗干物质量分别增加23.2%和12.5%，秧苗充实度分别提高15.5%和6.9%；在薄膜覆盖育秧下，是否低温炼芽对成苗率影响不显著，但经低温炼芽后的秧苗叶绿素含量和干物质积累量呈下降趋势。结果可为早稻育秧缓解低温伤害提供技术参考。

The effect of low-temperature hardening with tray overlapping on the quality of seedling in film overlay and open-air seedling raising was explored with the early rice variety Zhongjiazao 17 as the experimental material. The results showed that under open-air seedling raising condition, compared to the treatment without low-temperature hardening, the seedling rate of low-temperature hardening treatment increased by 8.8%, and the seedling quality was also higher, the chlorophyll content of seedlings of open-air seedling raising 15 d and 30 d treatments increased 8.7% and 37.1%, the dry weight increased 23.2% and 12.5%, and the seedling fullness increased 15.5% and 6.9%, respectively. Under the condition of film overlay raising, compared with no low-temperature hardening, the effect of low-temperature hardening on the seedling rate was not significant, but the chlorophyll content and dry matter accumulation of the seedlings showed a downward trend. The results provide technical reference for early rice seedling rasing to alleviate low-temperature damage.