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随着农业科技的不断发展,新的品种层出不穷。以水稻为例,从高秆常规稻——矮秆常规稻——三系杂交稻——二系杂交稻。每一次改革都使粮食产量大幅度增加。因此,良种在诸多增产因素中的比重也越来越大。据统计,我国目前良种的增产因素为30％,发达国家已达到40％左右。1995年9月召开的全国种子工作会上,国务院副总理姜春云指出,良种在粮、棉增产中的贡献率要提高到35％～40％。
With the continuous development of agricultural science and technology, an endless stream of new varieties. Take rice as an example, from high-stalk conventional rice-dwarf conventional rice-three-line hybrid rice-two-line hybrid rice. Every reform has resulted in a substantial increase in grain output. Therefore, the improved varieties in many factors also increase the proportion of more and more. According to statistics, the yield-raising factor of current seed production in China is 30%, and the developed countries have reached about 40%. At the National Seeds Work Conference held in September 1995, Jiang Chunyun, vice premier of the State Council pointed out that the contribution rate of fine varieties to grain and cotton production should be raised to 35% to 40%.