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1 品种更新、更换的概念种子是重要的、不可替代的农业生产资料。在诸多的生产措施中,良种所起的作用占全部增产措施的20%～30%,是其他任何措施代替不了的。随着生产条件和栽培条件的改善,良种将会显现出越来越大的经济效益和社会效益。一个优良品种要在生产中占据重要的地位,并能维持较长的年限,除其本身的优良种性外,还要经常进行防杂保纯,不断进行品种的种子更新。
1 species update, the concept of replacement of seeds is an important, irreplaceable means of agricultural production. Among the many production measures, the role played by the elite species accounts for 20% to 30% of the total stimulation measures, which can not be replaced by any other measures. With the improvement of production conditions and cultivation conditions, improved varieties will show more and more economic and social benefits. A good variety to occupy an important position in the production, and can maintain a long life, in addition to their own good nature, but also often anti-hybrid pure, continuous species breed updates.