The synergistic action of Azospirillum brasilense and effective microorganisms promotes growth and increases the productivity of green corn

Abstract

In view of the current dissemination of even more sustainable techniques, which allow the producer to explore the microbial biodiversity native to the property's soil and obtain effective microorganisms (EM), the hypothesis was tested that the biopriming of corn seeds using the co-inoculation of A. brasilense + EM could promote growth and increase the productivity of green corn. Additionally, the effect of treating seeds with humic acids was evaluated. For this, a field experiment was conducted using the following treatments: A. brasilense; EM; A. brasilense + EM; humic acids (Solo Humics) and Control. Co-inoculation of A. brasilense + EM potentiated the growth-promoting effects of diazotrophic (height and stem diameter increased 30 days after sowing - DAS, fresh and dry mass of aerial part at 90 DAS and dry mass of root at 60 and 90 DAS) and increased productivity of green corn (presented the highest averages for ear weight with and without straw). The treatment of seeds with humic acids showed promising effects only in the initial stages of crop development – when the plants evaluated were at 30 DAS. However, in the final evaluation phase (90 DAS) the effect of these acids became less satisfactory than microbial inoculation. The enrichment of inoculants of A. brasilense with EM is therefore a viable alternative for promoting growth and increasing productivity in the cultivation of green maize in addition to being a low complexity technology and even cheaper than the simple use of commercial inoculants.