Potassium is an essential nutrient and a major constituent of all living cells. Potassium is naturally present in greater concentrations in soils than any other nutrient. However, a large percentage of the potassium is unavailable to plants. The potassium-solubilizing bacteria can solubilize potassium-containing minerals and convert insoluble potassium to soluble forms of potassium that plants can absorb. Chemical fertilizers have a significant negative impact on the environment. Hence, biological fertilizers containing potassium-solubilizing bacteria could be a viable alternative to chemical fertilizers.

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Mechanism of action

Potassium-solubilizing microorganisms such as Bacillus megaterium and Bacillus mucilaginosus solubilize potassium for plants by various mechanisms. The microorganisms dissolve silicate minerals and release potassium through the assembly of organic and inorganic acids, acidolysis, polysaccharides, complex lysis, chelation, and exchange reactions.

Benefits of potassium-solubilizing bacteria

  • It promotes enzyme activation, nitrogen utilization, and the synthesis of sugars and proteins.
  • It promotes the growth of PGP bacteria in the rhizosphere.
  • It promotes natural mechanisms in the soil, thus maintaining soil fertility.


CFU count:  1×108 CFU/Gram, 1×109 CFU/Gram

Dosage of potassium-solubilizing bacteria

CFU Count


1×109 CFU/Gram

100 gm/acre or 250 gm/Ha

1×108 CFU/Gram

1 Kg/acre or 2.5 Kg/Ha

Mode of Application:

Soil Drenching and Drip irrigation.