Influence of Seed Treatment with Molybdenum on Soybean Photosynthesis and Yield under Mono-cropping and Relay Strip Intercropping System

The effect of seed treatment with molybdenum on soybean photosynthesis was studied under mono-cropping and relay strip intercropping system. The results showed that the Chl( a + b) content,pods per plant,seeds per pod,100-seed weight,and seeds yield of mono-cropping soybean was lower than those of relay strip intercropping soybean. However,the value of Chl a / b,net photosynthetic rate( net photosynthetic rate,Pn) and transpiration rate( transpiration rate,Tr) of monocropping soybean was higher than that of relay strip intercropping soybean. The Chl( a + b) content,the value of Chl a / b,Pn,stomatal conductance( stomatal conductance,Gs),intercellular CO2concentration( intercellular CO2 concentration,Ci),Tr pods per plant and yield were increased by molybdenum treatment. The above indexes were the highest with 2. 0g·kg- 1molybdenum treatment,and Pn,pods per plant and yield were higher by 36. 14%,27. 32% and 37. 25% respectively as compared with the control under the mono-cropping system,followed by 1. 0 g·kg- 1treatment. Whereas,in the relay strip intercropping system,the above indexes were the highest with 1. 0 g·kg- 1molybdenum treated the seeds,and Pn pods per plant and yield were higher by 34. 46%,68. 00% and 84. 85% respectively as compared with the control,followed by2. 0 g·kg- 1treatment. In a word,seed treatment with molybdenum improved the photosynthetic characteristics and yield of soybean,the molybdenum contribution to soybean yield in the relay strip intercropping system was higher than that in the mono-cropping system,and the optimum concentration of molybdenum in the relay strip intercropping system was lower than that in the mono-cropping system.