一、冬茬莴笋栽培技术1.育苗:选用抗病、高产的优良品种水挂丝,于8月下旬—9月下旬在拱棚内播种育苗。白天拱棚内主要采取棚膜通底风及遮阳等措施来降低温度,夜间没阴雨天气时通底风,分苗至缓苗阶段,白天必须遮荫,尽量创造适合莴笋生长的环境 First, winter stalks lettuce cultivation techniques 1 nursery: selection of disease-resistant, high yield varieties of fine silk hanging wire, in late August - late September in the arch shed seeding nursery. During the daytime, the main shed in the arch shed adopts the measures of covering the bottom wind and sunshade to reduce the temperature. When there is no rainy weather at night, it will end the bottom. During the day, the seedlings must be covered with shade, and try to create an environment suitable for the growth of lettuce