大豆品种的混杂和退化是当前生产上的一个重要问题。为防止大豆品种的混杂退化,必须认真贯彻执行「自繁、自选、自留、自用,辅之以必要的调剂」的种子工作方针,建立和健全良种繁育体系,种好管好大豆种子田,同时要加强品种的提纯复壮工作。大豆品种提纯复壮常用的方法是「混 Mixed and degenerate soybean varieties is an important issue in current production. In order to prevent the hybrid degeneration of soybean varieties, we must conscientiously implement the working principle of “self-propagation, self-selection, self-preservation and self-use, supplemented by the necessary adjustments” to establish and perfect a thoroughbred breeding system, At the same time to strengthen the variety of rejuvenation work. Common method of purification and rejuvenation of soybean varieties is "mixed