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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.
Highlights
One of the biggest challenges of modern agriculture is balancing the growing demand for food with the rational use and occupation of the environment
The biopriming of corn seeds with A. brasilense + effective microorganisms (EM) positively affected the plant height only at 30 days after sowing (DAS), so that the plants submitted to this treatment had the highest average for this variable (0.64 m)
This average was significantly higher than that observed for the Control (0.57 m) and for plants submitted to EM only (0.58 m) (Figure 2a, c and e)
Summary
One of the biggest challenges of modern agriculture is balancing the growing demand for food with the rational use and occupation of the environment. In this context, the development and application of technologies that guarantee productivity and that do not generate negative environmental effects have been stimulated. Co-inoculations are intended to associate different functional traits, often expressed by different microorganisms [6, 7, 8] In this way, biological nitrogen fixation (BNF), phytohormone synthesis, the ability of antibiosis to pathogens, as well as solubilization of different nutrients can be achieved with the use of the same inoculant, formulated from the mixture of two or more strains
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