一研究经过利用杂种优势是农业增产的主要途径之一。在油菜方面,从四十年代以来,国内外就有人从事油菜杂种优势的研究。到现在为止已提出用雄性不育系法、自交不亲和系法等来培育杂交油菜。这些方法均已初步应用于生产,并有一定效果。但是,上述方法的育种过程时间较长,且选育的杂交油菜其产量和适应力尚有局限。因此,在许多地方上述方法尚未推广应 One of the main ways to increase agricultural output through the use of heterosis is to study one. In rapeseed, since the 1940s, some people at home and abroad have been engaged in the study of rape heterosis. Until now, it has been proposed to cultivate hybrid rape using the male sterile line method, the self-incompatible line method and the like. These methods have been initially applied to the production, and have some effect. However, the breeding process of the above method takes a long time, and the yield and adaptability of the selected hybrid rape have some limitations. Therefore, in many places, the above methods have not yet been promoted