大棚育苗苗期温度管理是培育壮苗的重要环节。苗期控制温度的基本原则是“三高三低”，即“白天高、夜间低；晴天高、阴天低；出苗前、移苗后高，出苗后、移苗前低”。 除掌握上述基本原则外，还应根据不同蔬菜对温度的不同要求，合理控制温度。甘蓝、莴苣等喜凉类蔬菜苗期白天 Greenhouse nursery seedling temperature management is an important part of nurturing seedlings. Seedling control temperature is the basic principle of “three highs and three low,” that is “high during the day and night at low; sunny high, cloudy low; before emergence, after transplanting high after emergence, low before transplanting.” In addition to master the above basic principles, but also according to the different requirements of different vegetables temperature, temperature control. Cabbage, lettuce and other hi cold vegetables at seedling daytime