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采用大白菜自交不亲和系选育及杂种优势测定的方法，选育出大白菜一代杂种郑白４号。其特点：①多抗性：经人工接种鉴定，高抗病毒病，抗霜霉病、黑斑病，田间鉴定还抗软腐病。②丰产稳产：净菜产量７０９４．２～９７７９．０ｋｇ／６６７ｍ２，比对照豫白菜１号、丰抗７０增产８．３７％～３０．４０％。③品质佳：球叶含糖２．５％，粗纤维０．５７％。软叶率７０．６８％，熟食易烂，生食甜脆。④商品性状优：外叶浅绿，矮桩叠抱，结球紧实度达９８％。叶球黄白色，耐贮运。⑤高效益：１９９１～１９９４年在全国十余个省推广总面积４．０７万ｈｍ２，新增产值１．７６亿元。
Chinese cabbage selfing incompatibility breeding and heterosis determination methods, breeding a new generation of Chinese cabbage Zheng Bai 4. Its characteristics: ① multi-resistance: identification by artificial inoculation, high anti-virus disease, anti downy mildew, black spot disease, field identification also anti-soft rot. ② High yield and stable yield: Net yield 7094.2 ~ 9779.0kg / 667m2, compared with the control Yu cabbage 1, Feng anti-70 yield 8.37% ~ 30.40%. ③ good quality: sugarcane candy 2.5%, crude fiber 0.57%. Soft-leaf rate of 70.68%, cooked food easy to rotten, raw crisp food. Good commodity traits: outer leaves light green, short pile stacked embrace, the ball tightness of 98%. Leaves yellow-white, resistant to storage and transportation. ⑤ high efficiency: From 1991 to 1994 in more than ten provinces to promote a total area of 40,700 hm2, the new output value of 176 million yuan.