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Phosphorus solubilizing bacteria

PSB Biofertilizers – A Best substitute of DAP Fertilizers

PSB Biofertilizers (Phosphorus solubilizing bacteria)  Act as the bio fertilizer capable of solubilizing inorganic Phosphorus from insoluble compounds. Solubilization ability of rhizosphere microorganisms is considered to be one of the most important traits associated with plant Phosphorus nutrition.

PSB has been introduced to the Agricultural community as Phosphorus Biofertilizer

Phosphorus is one of the major essential macronutrients for plants and is applied to soil in the form of Phosphorus fertilizers. The Phosphorus level in the soil is about 0.05%. 

It is generally accepted that the mechanism of mineral Phosphorus solubilization by Phosphorus solubilizing bacteria (PSB Biofertilizers) strains is associated with the release of low molecular weight organic acids such as  such as formic, acetic, propionic, lactic, glycolic, fumaric, and succinic acids and acidic phosphatases like phytase synthesized by soil microorganisms in soil.



Nowadays a large portion of soluble inorganic Phosphorus which is applied to the soil as chemical fertilizer is immobilized rapidly and becomes unavailable to plants But Currently, the main purpose in managing soil Phosphorus is to optimize crop production and minimize P loss from soils.

PSB have attracted the attention of agriculturists as soil inoculums to improve the plant growth and yield. 


Benefits of PSB Biofertilizers :-

    • The use of Phosphorus or PSB biofertilizers is a promising approach to improving food production through enhancing agricultural yield as it is better to use an environmentally friendly approach.
    • Phosphorus solubilizing bacteria may also aid the growth of plants. 
    • Increase micronutrients availability to plant from the soil like Mn, Mg, Fe, Mo, B, Zn and Cu in addition to P2O5.
    • Encourage faster root growth for water and nutrient uptake.
    • produce organic acids like malic, succinic, fumaric, citric, tartaric acid and acetic acid which fasten the P2O5 up take, maturity and increase yield.
    • Increase resistance towards diseases and drought tolerance due to rapid cell development in the plants.
    • Compatible to other beneficial microbes with the plant like growth promoting substance.
    • Reduce 25 – 30% phosphatic fertilizer requirement.
  • The NPK uptake and management can be improved by the use of PSB.


Target Crops:-

Wheat, Rice, Pigeon Pea, Chick Pea, Lentil, Pea, Sorghum, Paddy, Millets, Oil seeds, Pulses & Vegetables.

Dosage: PSB can be used for all crops including paddy, millets, oilseeds, pulses and vegetables. Methods recommended for application are: 

Seed treatment: For 1 kg seed mix 10 ml/10gm of formulation/PSB in sufficient water and coat the seeds well with this solution and dry under shade before sowing. blend the mixture well and broadcast for 1-acre area near to root zone.

Soil application: Mix 1kg PSB inoculant with 50 kg finely powdered FYM. Broad cast this mixture at the time of last ploughing.

Dosage: 1kg/Acre

Note: In case of PSB, best results are obtained when applied with well decomposed organic manure.

 How PSB Fulfil the DAP requirement and Perform Better:

  • Rock Phosphorus, which is Major source of Phosphorus is made available to the plant with the help of Phosphorus Solublising Bacteria.
  • Use of Phosphorus Solubilising Bacteria or PSB Biofertilizers decreases the detrimental effects of Phosphorus fertilizers on crop and soil health.

 How PEP-PSB Different from the PSB Available in the market:       

They solubilize the insoluble forms of Phosphoruss like tricalcium, iron, and aluminium Phosphoruss into available forms.

They scavenge Phosphorus from soil layers.

They produce hormones and anti-metabolites which promote root growth.

They decompose organic matter and help in mineralization in soil.

When applied to seed or soil, bio fertilizers increase the availability of nutrients and improve the yields by 10 to 25% without adversely affecting the soil and environment.

This is some important point regarding Phosphorus Solubilising Bacteria or PSB Biofertilizers and its uses. You can follow our product page  of PSB Biofertilizers