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Growth-promoting bacteria in coinoculation in soybean
F S Fulaneti1, M M Ferreira2, R T Vey3
1Universidade Federal de Santa Maria - UFSM, Santa Maria, RS, Brasil.
Brazilian Journal of Biology = Revista Brasleira De Biologia
|September 24, 2025
Summary
Coinoculation with Bradyrhizobium japonicum and Bacillus aryabhattai or Pseudomonas fluorencens significantly boosts soybean yield. These growth-promoting bacteria enhance nodule formation, root development, and nutrient uptake, offering sustainable agricultural solutions.
Area of Science:
- Agricultural Science
- Microbiology
- Agronomy
Background:
- Growth-promoting bacteria are vital for sustainable soybean production.
- Optimizing microbial interactions enhances soybean productivity.
- Research is needed to assess coinoculation strategies.
Purpose of the Study:
- To evaluate the impact of coinoculation with growth-promoting bacteria on soybean grain productivity.
- To identify effective bacterial combinations for enhancing soybean yield.
- To explore the potential for reducing mineral fertilizer use.
Main Methods:
- Five experiments over two harvest seasons using randomized block and factorial designs.
- Evaluated eight treatments including single strains and combinations of Bradyrhizobium japonicum, Azospirillum brasilense, Bacillus aryabhattai, Bacillus megaterium, Biobokashi, and Pseudomonas fluorencens.
- Assessed productivity, grain mass, nodule parameters, soil coverage, and root development under varying irrigation and fertilization levels.
Main Results:
- Coinoculation of Bradyrhizobium japonicum with Pseudomonas fluorencens and Bacillus aryabhattai yielded optimal results.
- Significant increases in nodule number and mass, root growth, and soybean productivity were observed.
- Enhanced root volume and nutrient absorption suggest potential for partial replacement of mineral fertilizers.
Conclusions:
- Coinoculation with specific growth-promoting bacteria, particularly Bradyrhizobium japonicum combined with Pseudomonas fluorencens or Bacillus aryabhattai, is highly effective.
- These synergistic combinations improve soybean yield and offer sustainable agricultural practices.
- Findings support reduced reliance on mineral fertilizers through enhanced microbial-assisted nutrient uptake.
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