1983年我所自青岛市引进了城杂五号早熟大白菜,经小面积试种折合亩产13000斤,表现出生长快、产量高、品质好等优点。1984～19985年在南昌市郊试种面积近20亩,亩产9000～12000余斤,10月上、中旬收获。因此,增加了秋淡季市场供应的品种,销价也比较高,亩产值千元以上,高的达1500元左右。现将该品种的特性及栽培技术简介如下: 城杂五号是青岛市城阳乡城阳村科技队选育的一代杂种。株高34厘米,开展度50厘米,外叶13～15片叶,叶片浅绿色,叶柄白绿色。结球紧实,整齐一致,净菜率70％左右。叶球白色,炮弹形,球叶合抱。球高 In 1983, I introduced Chengzhao No.5 mature Chinese cabbage from Qingdao and converted it to 13000 kg per mu for a small area, demonstrating the advantages of fast growth, high yield and good quality. From 1984 to 1985, about 20 mu of cultivated area was planted in the suburbs of Nanchang, with a yield of 9,000-12,000 kilograms per mu. Harvesting took place in the middle and early October. Therefore, an increase of autumn and autumn market supply varieties, selling prices are relatively high, more than 1,000 yuan per mu, high of 1,500 yuan. Now the characteristics of the varieties and cultivation techniques are as follows: City hybrid No. 5 is Chengyang Village, Chengyang City, Qingdao City Science and Technology team breed a generation of hybrids. Plant height of 34 cm, the degree of 50 cm, the outer leaves of 13 to 15 leaves, light green leaves, petiole white-green. Knot tight, neat, net food rate of about 70%. Leaf ball white, shell-shaped, cotyledons. Ball high