中双4号是我所1988年以普通油菜品种中油821为母本，双低优质品种中双2号为父本，在隔离区内自然授粉后经人工接种菌核病鉴定和单株自交分离而育成的一个优质、高产、多抗的双低甘蓝型冬油菜新品种，1993年5月湖北省品种审定通过，鄂、赣、川等省列为重点推广的双低良种。技术 Shuangzhao 4 was established in 1988 with the common rape variety Zhongyou 821 as the female parent and the double-low quality Zhongzhong 2 as the male parent, which was identified by artificial inoculation sclerotinia and single self in the isolated area after natural pollination Separated and bred a new variety of high quality, high yield, multi-resistant double-low blue cabbage rapeseed varieties approved in Hubei Province in May 1993, Hubei, Jiangxi, Sichuan and other provinces as the focus of the promotion of double-low seed. technology