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一、改良城杂五号早中熟大白菜 曾在上海、江苏、甘肃、湖南等地大面积种植,一度成为当地的主栽品种。近年来,因城杂五号抗病性一般,病害时有发生,致使栽培面积逐年下降,亩产值减少。鉴于上述原因,青岛市蔬菜良种开发中心科技人员对原杂交组合进行改良,培育出改良城杂五号。该品种比城杂五号抗病性明显增强,而且单株重有所提高。1994年秋在上海青浦县赵屯乡进行了22个中晚熟品种比较试验,改良城杂五号表现最好,不仅比其他品种抗病,而且单株重也超过城杂五号。该品种在上海地区很受菜农的欢迎。
First, to improve the city on the 5th Early maturing Chinese cabbage in Shanghai, Jiangsu, Gansu, Hunan and other places planted a large area, once a local cultivars. In recent years, due to the urban disease resistance on the 5th general, diseases have occurred from time to time, resulting in declining cultivation area, reduced mu output. In view of the above reasons, Qingdao vegetable seed development center of science and technology personnel to improve the original hybrid combination, breed improved city hybrid V. The variety than City hybrid five significantly increased disease resistance, and the weight per plant has been increased. In the autumn of 1994, 22 middle and late-maturing varieties were compared in Zhaotun Township, Qingpu County, Shanghai. The improved No.5 hybrid was the best, not only resistant to disease than the other varieties, but also weighed more than the No. 5 in City. The variety is very popular with vegetable growers in Shanghai.