Department of Soil Science, G.B. Pant University of Agriculture and Technology, Pantnagar, Nainital, U.P., 263145.
Soybean (Glycine max L. Merril, var. PK-416) was raised in pots in two different soils to study the effectiveness and competitiveness of B. japonicum strains. Nodulation, except at 30 DAS, plant biomass, N uptake and grain yield were significantly higher in Haldi loam. S12 and SB31 strains were significantly more effective than TAL94 registering 61.7 and 77.8% more nodules, respectively, at 60 DAS. Strain 812 showed the highest N uptake while SB31 gave higher nitrogenase activity over TAL 94 at 30 DAS. The soils did not differ significantly for nodule occupancy. However, strain 812 and SB31 occupied significantly more nodule than TAL94.
Effectiveness, competitiveness, N2 fixation, nodule occupancy, nitrogenase activity, Bradyrhizobium
