IRA Biotech 
PSB is a microbial biofertilizer formulated with Bacillus megaterium, Bacillus firmus and Pseudomonas striata. The consortium helps solubilize fixed and poorly available forms of phosphorus in the soil, improving phosphorus availability to plants and supporting healthy root development, crop growth and efficient nutrient utilization.
Produced using lyophilization (freeze-drying) technology to enhance microbial viability, stability and shelf life.
Composition
| Parameter | Detail |
|---|---|
| Microorganisms | Bacillus megaterium, Bacillus firmus, Pseudomonas striata |
| Microbial count | 1 × 10¹⁰ CFU |
| Technology | Lyophilization (freeze-drying) |
Mode of Action
Beneficial phosphorus-solubilizing microorganisms establish in the soil and rhizosphere and produce organic acids, enzymes and metabolites that help release phosphorus bound with calcium, iron and aluminium compounds. This biological activity improves phosphorus availability in the root zone and supports efficient nutrient uptake.
Key Benefits
- Solubilizes fixed and unavailable phosphorus in the soil.
- Improves phosphorus availability and nutrient-use efficiency.
- Promotes stronger root development and crop establishment.
- Supports flowering and reproductive development.
- Improves beneficial microbial activity and soil biological fertility.
- Supports reduced dependency on conventional phosphatic fertilizers, with a saving of 25% in fertilizer cost.
- Increases crop yield by up to 15%.
- Safe, organic-certified formulation.
- Enhanced microbial stability through lyophilization technology.
Dosage and Application
Recommended dose: 1 litre per acre.
- Foliar application: dilute 1 litre in 150–200 litres of water per acre and spray uniformly over the crop.
- Drip / fertigation: apply 1 litre per acre through the drip or fertigation system with sufficient irrigation water for uniform distribution.
- Soil application: mix 1 litre with 50–100 kg of well-decomposed compost / FYM or a suitable organic carrier per acre, broadcast uniformly and follow with irrigation.
The best time of application is the evening.
Recommended Crops
Cereals, pulses, vegetables, horticultural crops, fruit crops, plantations, commercial crops and pastures.
Compatibility
Compatible with most biological and organic agricultural inputs. Avoid direct mixing with bactericides, disinfectants or strongly antimicrobial products.
Storage
Store in a cool, dry place away from direct sunlight and excessive heat. Keep the container tightly closed.
