“有了优良品种,即不增加劳动力、肥料,也可获得较多的收成”。这是毛泽东同志很早就提出来的,说明选种工作的重要。的确选种是生产发展的首要问题,基本问题。这个问题既如此重要,我国古代和现代,对这方面的理论、原则和方法是怎样的呢? “With good varieties, that is, without increasing labor, fertilizer, but also get more harvest.” This is what Comrade Mao Tse-tung put forward very early on, explaining the importance of the work of selecting plants. Indeed, the selection of species is the primary issue of production and development and the basic issue. This issue is so important. What are the theories, principles and methods in ancient and modern China?