| This experiment was carried out to study the effects of dressing seeds with Molybdenum (Mo) at different concentrations (B0, control,0 g/kg; B1,0.5g/kg; B2,1.0 g/kg; B3,2.0g/kg; B4,4.0g/kg) on soybean's root nodule nitrogen fixation and nitrogen metabolism, photosynthetically physiological characteristics, accumulation and distribution of biomass, and seed yield and quality, by selecting limited-pod type soybeans variety (Gongxuanl#) grown in Sole cropping and Relay strip inter-cropping system. The main results are showed as follows:1. Mo treatments were beneficial to rootsystem of soybean, root volume, the nitrogen contents in root, stem and leaf in both Sole cropping and Relay strip inter-cropping system. Taproot length in Relay strip inter-cropping system were higher than in Sole cropping system, number of first lateral root, root-nodule fresh in Sole cropping system were higher greater than in Relay strip inter-cropping system, weight root volume and number of root-nodule in Sole cropping system were significantly greater than in Relay strip inter-cropping system at the growth stages of R2. In Sole cropping system, taproot length, number of first lateral root, root volume, root-nodule fresh weight, number of root-nodule and the nitrogen contents in root, stem and leaf increased firstly and decreased afterward along with the increment of Mo concentrations. The number of first lateral root, root volume, root-nodule fresh, weight the number of root-nodule and the nitrogen contents in root, stem and leaf reached maximum at B3(2.0g/kg), but the second largest at B2(1.0g/kg). In Relay strip inter-cropping system, all the taproot length, number of first lateral root, root volume, root-nodule fresh weight, number of root-nodule and the nitrogen contents in root, stem and leaf reached maximum at B2(1.0g/kg).2. Mo treatment significantly increased the content of Chl(a+b) and the chla/b ratio. At the same time, Pn, Tr, Ci and Gs increased significantly within the application of Mo treatment. In Relay strip inter-cropping system, the content of Ch1 (a+b) were higher than in Sole cropping system at the growth stages of V5, but the chl a/b ratio in Sole cropping system were higher than in Relay strip inter-cropping system over the growth stages between R2-R4, this changes were related to the increment of Ch1 b content under weak light. At the same time, the net photosynthesis rate (Pn) and transpiration rate (Tr) in Sole cropping system were significantly greater than in Relay strip inter-cropping system, but the concentration of intercellular CO2 (Ci) in Relay strip inter-cropping system was significantly higher than in Sole cropping system, and the stomatal conductance (Gs) in Relay strip inter-cropping system was slightly higher than in Sole cropping system without reaching significant level. In Sole cropping system, the contents of Chl(a+b) across different Mo concentrations showed as B3>B2>B1>B4>B0, the chl a/b ratios showed as B3>B2>B2>B1>BO, and the Pn at B3 (2.0g/kg) was 36.10% higher than control. In Relay strip inter-cropping system, the contents of Chl(a+b) showed as B2>B3>B4>B1>BO, the chl a/b ratios showed as B2>B3>B1>B4>BO, and the Pn at B2 (1.0g/kg) was 34.42% higher than that of control.3. The dry weights of root,stem,leaf,pod, the output and contribution ratios increased significantly within the application of Mo treatments. In Sole cropping system, output and contribution ratio of root, stem, leaf increased firstly and decreased afterward along the increment of Mo concentrations, reaching maximum at B2(1.0g/kg), the output ratios of root, stem and leaf were 34.91%,-4.43%and 6.79%, respectively, and the contribution ratios of root, stem and leaf were 23.19%,-2.07% and 1.46%, respectively; In Relay strip inter-cropping system, output and contribution ratios of root, stem and leaf reached maximum at B2(1.0g/kg), the output ratios of root, stem and leaf were 45.35%,27.00% and 5.80%, respectively, and the contribution ratios of root, stem and leaf were 28.41%,15.81% and 1.35%. In Sole cropping system, as the peak values of dry weights of root, stem, leaf and pod postponed to occur at R6, large amount of nutritious substances stayed in root, stem, leaf, and so the output and contribution ratios of stem appeared minus value, and finally, reduced the seed-filling rate. the output and contribution ratios of root, stem, leaf in Relay strip inter-cropping system was slightly higher than in Sole cropping system.4. Pod number per plant, seed number per pod,100-seed weight and yield per plant increased significantly within the application of Mo treatments. Seed number per pod and yield per plant in Relay strip inter-cropping system were higher than in Sole cropping system. In Sole cropping system, Pod number per plant, seed number per pod and yield per plant as a single apex curve with the increment of Mo concentrations, The peak value at B2, but the second largest at B1, the Pod number per plant, seed number per pod and yield per plant at B2 was 23.38%,35.79%,33.01% higher than control,100-seed weight at B1 was 22.57 g·100-seed-1; In Relay strip inter-cropping system, Pod number per plant, seed number per pod and yield per plant as a single apex curve with the increment of Mo concentrations, The peak value at B2, but the second largest at B3, the Pod number per plant, seed number per pod and yield per plant at B2 was 28.86%,35.83%,39.44% higher than control, 100-seed weight at B2 was 23.03 g-100-seed-15. The protein content of seed in Relay strip inter-cropping system was higher than in Sole cropping system. But the fat content of seed in Sole cropping system was no significantly differences than in Relay strip inter-cropping system and the Mo content of seed in Sole cropping system was higher than in Relay strip inter-cropping system. The protein content and the fat content increased firstly and decreases afterward along with the increment of Mo concentrations. In Sole cropping system, the fat content reached maximum at B2 (1.0g/kg), and the protein content reached maximum at B3 (2.0g/kg); In Relay strip inter-cropping system, the fat content reached maximum at B1(0.5g/kg), the protein content reached maximum at B2 (1.Og/kg). The Mo content in seed decreased firstly and increases afterward along with the increment of Mo concentrations, reached maximum at B4 (4.0g/kg) in both Sole cropping and Relay strip inter-cropping system. |
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