中文摘要：

化控是大豆一项重要的增产技术。为探明化控条件下大豆非叶光合器官对粒重相对光合贡献的变化规律，以黑农41和新早-1为材料，采用铝铂遮光法研究了花期麦业丰化控处理（CK、化控1次、化控2次）条件下，大豆鼓粒期间荚、叶柄、叶片对粒重相对光合贡献的变化。结果表明，荚对粒重相对光合贡献依次为4．84％、8．44％、17．58％；叶柄对粒重相对光合贡献依次为5．91％、3．34％、12．92％；叶片对粒重相对光合贡献分别为34．03％、26．29％、17．00％。麦业丰化控提高了荚、叶柄对粒重相对光合贡献，降低了叶片对粒重相对光合贡献。化控技术增产与叶片和豆荚光合性能的改变有关。

英文摘要：

Chemical control is an important technology to increase soybean yield. The objective of current research was to investigate the contribution of non-leaf photosynthetic organs to seed weight under chemical control condition. Heinong 41 and Xinzao-1 were used as materials and aluminum foil shading method was adopted, three Maiyefeng chemical control treatments （CK,onee chemical control, twice chemical control ） were applied at blooming stage. The photosynthetic contribution of pod,petiole and leaf to seed weight were calculated on yield reducing basis when treated by aluminum foil shading method. Under each chemical control treatment, the relative photosynthetic contribution of pod to seed weight was 4. 84%, 8.44% and 17.58% ,respectively;petiole was 5.91% ,3.34% and 12.92% ,respectively;leaf was 34.03% ,26.29% and 17.00%, respectively. The results suggest that Maiyefeng chemical control could improve relative photosynthetic contribution of pod and petiole to seed weight while decrease relative photosynthetic contribution of leaf. Hence, the yield-increasing effect of chemical control may relate with the alternation of photosynthetic contribution between leaf- and non- leaf organs to seed yield.