生菜为半耐寒蔬菜,喜冷凉,不耐高温和严寒。因此,要实现生菜的周年生产和供应,克服高温和低温是关键。 1、克服夏季高温:①低温处理种子。夏季播种生菜时,气温超过30℃难以发芽,故应控制在5—20℃条件下进行浸种和催芽,以提高出苗率。②选择耐热品种。如花 Lettuce is a half hardy vegetables, hi cold, not high temperature and cold. Therefore, to achieve annual production and supply of lettuce, it is crucial to overcome the high temperature and low temperature. 1, to overcome the summer heat: ① low temperature treatment of seeds. Summer sowing lettuce, the temperature exceeds 30 ℃ difficult to germinate, it should be controlled under the conditions of 5-20 ℃ Soaking and germination, in order to improve the emergence rate. ② choose heat-resistant varieties. flowery