Combination of Azospirillum and Bradyrhizobium on Inoculant Formulation Improve Nitrogen Biological Fixation in Soybean

Co-inoculation in soybean with Azospirillum brasilense and Bradyrhizobium spp. is a consolidated practice to ensure nitrogen supply maximize productivity sustainability. This study aimed evaluate the agronomic efficiency of co-inoculation soybean, via seed or in-furrow, doses mixed inoculant containing A. same formulation. The experiments were conducted under field conditions four different edaphoclimatic regions compare seven treatments: Control without (N) (T1), 200 kg ha-1 mineral N fertilizer (T2), 100 mL standard liquid (T3) 50 kg-1 seeds, (T4) (T5) (T6) 300 (T7) applied in-furrow. Nodulation characteristics (number mass nodules) carbon metabolism (dry mass, content, accumulation aerial part) evaluated at phenological stage R2 (full flowering—there an open flower one two uppermost nodes). At maturity (R8—full maturity—95% pods have reached their full mature color), yield, 1,000 grains, content grain export measured. data submitted analysis variance using F test comparison means was performed Duncan (5%). Under conditions, in-furrow equivalent superior for total number nodules, export, productivity, grains. use formulation meets demand resulted increases 28%, 18% 7.4% compared control nitrogen, respectively.