生菜又名叶用莴苣,分结球莴苣和长叶莴苣等类型,以薄而柔嫩的叶片为食用器官,稍带苦味,具有特殊的风味,含有丰富的营养物质和多种矿质元素,是群众喜爱的一种速生蔬菜。1 生菜对环境条件的要求生菜喜冷凉气候,种子在4℃开始发芽,发芽适温15～20℃,茎叶生长适温为11～18℃,结球期适温17～18℃,幼苗能耐-5℃低温,气温高于21℃时生长不良。对空气湿度要求不高,而对土壤湿度要求严格,幼苗期土壤以保持湿润为宜,发棵期适当控水,结球期水分要充足。生菜对土壤的适应性较强,在疏松、肥沃的微酸性土壤中生长最好。2 栽培技术要点 Lettuce, also known as leaf lettuce, sub-ball lettuce and romaine lettuce and other types of thin and soft leaves for the edible organs, slightly bitter, with a special flavor, rich in nutrients and a variety of mineral elements, is the masses A favorite fast-growing vegetable. 1 lettuce on the environmental conditions lettuce like cold climate, the seeds began to germinate at 4 ℃, germination suitable temperature 15 ~ 20 ℃, stems and leaves suitable temperature for 11 ~ 18 ℃, the appropriate temperature during heading stage 17 ~ 18 ℃, seedlings Can withstand -5 ℃ low temperature, the temperature is higher than 21 ℃ poor growth. Demands on the air humidity is not high, but strict requirements on soil moisture, soil moisture in seedling stage is appropriate, hair appropriate water control period, water should be adequate during the balling. Lettuce has strong adaptability to the soil and grows best in the loosely and fertile slightly acidic soil. 2 cultivation techniques