The Photosynthetic Physiology Responses of Intercropping Soybean Under Different Planting Density

In order to improve the intercropping soybean production,the effects of different planting densities on photosynthetic characteristics of soybean cultivar of Qiandou 7 under intercropping with maize were studied.The results showed that: 1) Under different density of intercropping soybean,the photosynthetic rate,transpiration rate,stomatal conductance and intercellular CO2 concentration between each treatment had no significant difference to corn,but had significant difference to soybean.The photosynthetic rate increased with the increase of density in a certain extent,while decreased if exceeded,other indexes had no regular variation with the change of density.2) The treatment 4(167 000 plants/hm2) had the highest photosynthetic rate,and was conducive to the construction of rational soybean group and thus enhanced soybean yield.