大豆除主茎叶外分枝上也着生了许多叶片,平井(1962)从氮素成分、狄村等(1964)从光合能力方面曾对主茎和分枝叶进行了探讨,指出二者存在质的差别。通常分枝叶是在主茎叶完全展开后开始发育,所以,大豆处于旺盛生长时期时,许多正在发育的分枝叶往往被主茎叶覆盖,因此,在这种大豆田中,茎叶繁茂而子实产量却很低。作者考虑这种情况是否与主茎叶和分枝叶同化的光合产物在运输和分配上存在着差异有关。本实验于成熟期对主茎叶和分枝叶分别喂入~(14)CO_2之后追踪其转移去向。 Soybean also produced many leaves on the branches other than the main stem and leaves. Hirai (1962) discussed the main stem and branch leaves from the photosynthetic abilities of nitrogen components and Di (1964) Qualitative difference Usually the branch leaves begin to develop after the main stem leaves are fully expanded. Therefore, when the soybean is in a vigorous growth period, many developing branch leaves are often covered by the main stem leaves. Therefore, in this soybean field, the stems and leaves are lush and fruiting Yield is low. The authors consider whether this situation is related to differences in the transport and distribution of photosynthetic products assimilated by the main stem and branch leaves. In this experiment, main stem and branch leaves were infused with ~ (14) CO_2 at their maturity stage to follow their migration direction.