Abstract— The aim of the current study is to assess the initial development of soybean (Glycine max (L.) Merrill) subjected to inoculation and co-inoculation with Bradyrhizobium japonicum and Azospirillum brasilense using phenological parameters such as leaf area and dry matter partitioning of leaves, stems and roots, as well as leaf nitrogen content. The experiment was conducted in a greenhouse at Lagoa da Cruz Farm, a research base belonging to Dom Bosco Catholic University. The soybean variety CD 2728 IPRO, which has a 120-day cycle, was sown in 5,000-ml plastic pots. The experimental design followed a completely randomized methodology, with four treatments and four repetitions, using the inoculation with nitrogen fixing bacteria such as Bradyrhizobium japonicum, Azospirillum brasilense, Bradyrhizobium japonicum + Azospirillum brasilense (co-inoculation), and the witness. The leaf nitrogen content analysis, as well as the phenological measurements of the leaf area and the dry weight of the shoot and root system, were performed 30 days after sowing. According to the herein obtained results, it was possible concluding that the initial soybean development was benefited by the co-inoculation with Azospirillium brasilense + Bradyrhizobium japonicum in the root dry matter partitioning.
Keywords— symbiosis, rhizosphere, nitrogen, partitioning.
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