叶用莴苣 别称生菜。菊科莴苣属以叶片供食的品种。有长叶莴苣、皱叶莴苣、结球莴苣等。原产地中海沿岸。因西餐中均习惯于剥叶生食，故称为生菜。
叶用莴苣属喜冷凉蔬菜，在炎热的季节栽培，植株往往遭受伤害或生长不良。
Adapted to cool climate, lettuce (Lactuca sativa L. ) is liable to be heat injured or grow poorly when grown in hot seasons.
种质耐热性鉴定是在炎热季节选择相对适宜品种和培育耐热叶用莴苣品种的一项基础工作。
Heat resistance identification is the basic job in variety selection for hot seasons, as well as for breeding of heat resistant varieties.
在叶用莴苣采收前一周，将营养液换成清水，对叶用莴苣产量影响不大，叶用莴苣完全可以利用前期吸收的营养维持生长，硝酸盐累积大量减少，可有效的控制硝酸盐含量，改善品质。
Nutrient solution had been replaced water before lettuce was reaped for a week, which can reduce effectively accumulation of nitrate in lettuce, moreover, the effect of the yields isn't apparent.
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