| Abstrakt: |
Co‐inoculation of soybean with plant growth‐promoting microorganisms has the potential to increase yield, and the Amazon is a biome rich in these beneficial microorganisms. Soybean is the most important grain crop in Brazil and is highly benefited by inoculation with Bradyrhizobiumspp. strains, both of which represent exotic symbiotic partners. The objective of this study was to evaluate the effects of soybean co‐inoculation with Amazonian strains of Trichoderma asperellumand Bacillus amyloliquefaciens. Greenhouse and field experiments were conducted during the 2020 and 2021 crop seasons in Brazil, respectively. The experimental design was completely randomized in the greenhouse, and randomized blocks were used in the field, both with 3 × 2 factorial schemes. Standard inoculation with Bradyrhizobiumand co‐inoculation with T. asperellumand B. amyloliquefacienswas considered the first factor, and the second factor was represented by phosphate fertilization (0 and 100 kg ha−1of P2O5). The root system volumes were 25% and 17% higher than those of the standard inoculation with T. asperellumand B. amyloliquefaciens, respectively. In 2020, co‐inoculation with T. asperellumincreased yield by 15%, plant height by 27%, and net profit by up to 121 USD compared with standard inoculation. In 2021, co‐inoculation with T. asperellumand B. amyloliquefaciensresulted in increases in several growth parameters compared to those with standard inoculation, including 7% and 13% greater yields, and 159 USD and 309 USD increases in net profit, respectively. Our results indicate the possibility of expanding soybean co‐inoculation with local strains of Bacillusand Trichoderma, with benefits for productivity and profitability. It is possible to expand the co‐inoculation of soybean with other microorganisms.Regionalized strains can benefit soybean productivity and profitability.Amazonian strains in soybean co‐inoculation promote increased root volume. |
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