生菜是莴苣的一种,即食叶莴苣,它以生食为主故叫生菜。生菜原产于地中海沿岸,唐代由海路传人我国广东、广西、福建栽培较多。近几年来,我国沿海许多城市陆续引进试种。我所1990年开展了生菜研究,发现生菜适应性强,一年四季均可种植,特别是夏季种植优越性多。 1.耐高温:华东地区6月份的日平均温度26～28℃,日最高温度可达33～35℃,在上述高温 Lettuce is a kind of lettuce, that is, lettuce leaves, it is mainly raw lettuce. Lettuce native to the Mediterranean coast, passed by the sea in the Tang Dynasty, Guangdong, Guangxi, Fujian, more cultivated. In recent years, many cities in our coastal areas have successively introduced trial planting. I conducted a lettuce study in 1990 and found that lettuce adaptability can be planted throughout the year, especially in the summer planting more advantages. 1. High temperature: East China in June the average daily temperature of 26 ~ 28 ℃, the maximum daily temperature up to 33 ~ 35 ℃, in the high temperature