大同市栽培西瓜历史悠久,但一直是当地大型瓜品种,晚熟,糖分低,品质差,易空心,为了使全市人民吃到早熟和品质优良的西瓜,1977年4月从中国农业科学院引进中育1号、中育2号、北京无籽22号和北京2号(四倍体)四个早熟的小型瓜品科,选 Datong City, has a long history of cultivation of watermelon, but has always been a large local varieties of melon, late maturing, low sugar, poor quality, easy to hollow, in order to make the city people eat early and good quality watermelon, April 1977 from the Chinese Academy of Agricultural Sciences No.1, Zhongyu No.2, Beijing No.22 and Beijing No.2 (Tetraploid), four precocious small melon products