５０年代以来，水稻随着主栽品种的更新换代，产量库容和源强度不断扩增，促使稻谷产量登上新台阶。对不同历史时期主栽品种观测表明：库容增幅大于源强度增幅，从而库源比逐步提高。库客扩增主要靠每穗粒数增加，源强度提高主要靠叶面积扩大。株叶型的改进，确保了半矮秆常规稻和杂交稻的叶面积与群体生长速率得以同步增长。 Since the 1950s, with the upgrading of main cultivars, the yield, storage capacity and source intensity have been constantly expanding, prompting the rice production to a new level. The observation of main cultivars in different historical periods shows that the increase of storage capacity is greater than the increase of source intensity, and the ratio of source to source increases gradually. Bankrupt mainly by grain per spike increased, the main source of strength increased mainly by the expansion of leaf area. The improvement of the plant leaf type ensured that the leaf area and the group growth rate of the semi-dwarf conventional rice and hybrid rice increased synchronously.