莴笋在生产上可进行春、秋两季栽培。由于长江流域春莴笋收获期正值多雨季节,不利于苔茎晾晒干制,在栽培上以秋栽为主。秋莴笋对热量和光照的要求较为严格,为了不收霜后菜,沿江地区一般都需在8月下旬左右播种。此时正值高温炎热季节,温度多在29℃以上,严重地影响了种子的发芽和出苗。因此,如何在高温期打破休眠,促进种子发芽和出苗,乃是秋莴笋栽培中的关键所在。针对这一问题,我们经过了反复试验,找出了 Lettuce in the production of spring and autumn can be cultivated. As the harvest of the spring lettuce in the Yangtze River valley coincided with the rainy season, is not conducive to dry stem mulberry drying, mainly in autumn planting planted. Autumn lettuce on the heat and light of the more stringent requirements, in order not to frost dish, along the river are generally required to sow around late August. At this time positive high temperature hot season, the temperature more than 29 ℃, seriously affecting the germination and seedling emergence. Therefore, how to break dormancy in high temperature and promote seed germination and emergence, but the key to autumn lettuce cultivation. In response to this problem, we have been tested repeatedly and found out