Protein content in Glycine max grains influenced by the mixed inoculation of Bradyrhizobium japonicum and Azospirillum brasilense

Soy is mainly valued for high protein content when compared to other crops. However, it had been common to visit genetic materials with the same lower and lower protein levels, a fact that mainly displeased animal feed manufacturers. The objective of this study was to evaluate Azospirillum and Bradyrhizobium on the protein content of soybeans, grown under low latitude. The experimental design was a randomized complete block design with two cultivars (TMG 1288 RR and M 9144 RR) and five doses of Azospirillum brasilense (0, 100, 200, 300 and 400 mL ha -1 ). The evaluation was performed at the R8 stage, where the heavy, weighted and measured variables and the protein content of the grains (%) were analyzed. The mixed use of Bradyrhizobium via seed and Azospirillum via foliar caused an increase in protein levels, in all planting seasons and cultivars. High and precipitated low temperatures contributed to the increase of grain protein contents, when in the presence of Azospirillum , excess of cultures by environmental parameters and genetic factors, but also for the nutritional factors that are metabolized by the plant and assimilated in the form of reserves without grain, due to the application of associative bacteria.