Associação de Bradyrhizobium, Azospirillum e Pseudomonas no tratamento de sementes de soja

Abstract

Soybean [Glycine max (L.) Merril] is currently one of the most produced crops in the world, with Brazil being one of the largest producers of the grain, holding, in the last crop year (2020/2021), approximately 37% of the world production. In view of this, the use of new technologies in the production chain are fundamental for increasing productivity. Therefore, the use of biological agents has been increasing in culture and has contributed to a more sustainable production process. The present work aimed to evaluate the efficiency of the association of Bradyrhizobium, Azospirillum and Pseudomonas in the treatment of soybean seeds. The research was carried out at the experimental area of the Federal University of Technology, Dois Vizinhos campus, during the 2020/2021 crop year, consisting of 4 treatments: 1) Bradyrhizobium japonicum; 2) Bradyrhizobium japonicum + Azzospirillum brasilense; 3) Bradyrhizobium japonicum + Pseudomonas fluorescens and; 4) Bradyrhizobium japonicum + Azospirillum brasilense + Pseudomonas fluorescens. The experimental design was randomized blocks, in 4 replications, with plots of 24m2. The variables nodulation and number of branches per plant were analyzed at 60 days after emergence, counting 20 plants per plot. The parameters plant height (cm), number of pods per plant and productivity (Kg há-1) were performed at the time of harvest, also considering 20 plants per plot, except for productivity, considered the entire plot. The results demonstrate that the association of Bradyrhizobium japonicum + Azospirillum brasilense + Pseudomonas fluorescens is efficient, differing significantly in the parameters plant height (cm), number of pods per plant and productivity (Kg ha-1) of the other treatments.