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Growth-promoting bacteria in coinoculation in soybean.

F S Fulaneti1, M M Ferreira2, R T Vey3

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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.

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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.