本文根据1978—1983年大豆高产栽培材料,探讨了亩产200—250kg高产群体叶面积消长规律、光合势、净同化率与产量的关系。分析结果表明,光合势对经济产量的贡献率高达64.3％,而净同化率的贡献率仅占13.8％。用判别法判别分析结果表明,由亩产200kg提高到250kg产量水平,在目前栽培条件下,主要靠生育中、后期的光合势,而改善净同化率条件创高产的难度较大。 Based on the high-yield soybean cultivars from 1978 to 1983, the relationship between leaf area, photosynthetic potential, net assimilation rate and yield of high-yielding population of 200-250 kg per mu was studied. The results show that the contribution rate of photosynthesis to economic output is as high as 64.3%, while the net assimilation rate contributes only 13.8%. Judgment by discriminant analysis results show that from 200kg per mu to 250kg output level, under the current cultivation conditions, mainly by the growth of the late photosynthetic potential, while improving the net assimilation rate of high yield is more difficult.