蔬菜生产受气候条件影响很大,北京地区冬季因温度过低不能进行露地栽培,盛夏高温多雨也不利于许多蔬菜的生长,一年中只有春、秋两季温度适宜、光照充足,是多种蔬菜生长的大好季节,所以多年来北京的蔬菜生产主要是春、秋两大季。生产的季 Vegetable production is greatly affected by climatic conditions. In winter, Beijing can not be cultivated in open field due to low temperature. In summer, hot and rainy weather is not conducive to the growth of many vegetables. In the year, only the spring and autumn temperatures are adequate, Vegetable growing season, so many years of Beijing’s vegetable production is mainly spring and autumn two seasons. Production season