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玉米是生产上利用杂交优势最早最广泛的农作物之一，它已经成为增加玉米产量提高经济效益的一项重要途径。但近年来，随着我区玉米自交系数量的增多和繁殖世代的增加，以及选择标准上的差异，使不少自选、外引的自交系在制种过程中不讲究科学管理，在种子经营中不加强监督检验?
Corn is one of the earliest and broadest crops in the production and utilization of hybridization. It has become an important way to increase corn yield and improve economic efficiency. However, in recent years, with the increase of the number of maize inbred lines in our region and the increase of breeding generations, as well as the differences in selection criteria, many self-selected and imported inbred lines do not pay attention to scientific management in the process of seed production. Seed management does not strengthen the supervision and inspection?