Co-inoculation of Bradyrhizobium japonicum and Azospirillum brasilense in the Soybean Crop

The objective of this paper was to evaluate the effect of the co-inoculation of Bradyrhizobium japonicum (B. japonicum) and Azospirillum brasilense (A. brasilense) on the agronomic characteristics of the soybean crop in the central region of State of Rio Grande do Sul (RS). The experiment was conducted during three harvests (2016/2017, 2017/2018, 2018/2019), in the central region of the State of RS. The treatments were: T1-inoculation with 1 dose B. japonicum; T2-co-inoculation with 1 dose of B. japonicum + 1 dose of A. brasilense; T3-co-inoculation with 2 doses of B. japonicum + 1 dose of A. brasilense; T4-co-inoculation with 2 doses of B. japonicum + 2 doses of A. brasilense; T5-co-inoculation with 1 dose of B. japonicum + 2 doses of A. brasilense; T6-without inoculation (control). The determinations were: shoot and root system dry mass, number and dry mass of nodules, and grain yield. It was observed that the use of co-inoculation with 1 dose of B. japonicum + 2 doses of A. brasilense provided a higher dry mass of nodules and grain yield of the soybean crop.