Abstract
A field experiment was conducted at the research farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh to study the effectiveness of Bradyrhizobium japonicum strains on two varieties of soybean viz. Sohag and Bangladesh Soybean-4. The treatments were non inoculated control, seed inoculation with either Bradyrhizobium japonucum strains TAL102, TAL1906 or the mixed culture of strains TAL102 and TAL1906, Nitrogen amount of 25 or 50 kg/ha. Bradyrhizobium inoculation had a significant positive effect on nodulation, nitrogenase activity, growth, dry matter production, N content in shoot, N uptake by shoot, yield attributes, protein content in seed and seed and stover yields of soybean. The highest seed yield of 2511 kg/ha was obtained in Bangladesh Soybean-4 inoculated with Bradyrhizobium japonicum strain TAL102. Treatments consisting of chemical nitrogen fertilizer did not perform well compared to those employing the Bradyrhizobium inoculant.
