Phosphate Solubilizing Bio fertilizer

CFU – 5 X 10^7 per gm, 1 x 10^8 per ml

Mode of action:
- Due to immobilization of phosphate by mineral ions such as Fe, Al and Ca and organic acids, the rate of available phosphate in soil is well below plant needs. Chemical fertilizers are also immobilized in the soil, immediately so that only 20% of added fertilizer is absorbed by plants.
- It helps in converting insoluble phosphatic compounds such as rock phosphate, bone meal and basic slag particularly the chemically fixed soil phosphorus into available form.
- Such organism not only assimilates phosphorus but also cause a large amount of soluble phosphate to be released in excess of their own requirements and saves P2O5 up to 30 – 50 Kg/ ha.
- activity is determined by the ability of microbes to release metabolites such as organic acid (lactic acid, malic acid, gluconic acid, fumaric acid, succinic and acetic acid).
- Inorganic phosphorus is solubilized by action of organic (gluconic, ketogluconic) and inorganic acids (Hcl) secreted by PSB and maintain the soil pH. The pH of rhizosphere is lowered the bio-carbonates release (anions/cation balance) and oxygen/carbon oxide gaseous exchange. Phosphorus solubilizing ability Of it has direct correlation with pH of the medium.

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.
it 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.

Ingredients Used in Production	Percentage
Base Carrier based*	in form of moist/dry powder or granules, or liquid based – Dextrose
Viable cell count CFU	min. 5×10^7 cell/g of powder, granules or carrier material or 1×10^8 cell/ml of liquid
Contamination level	No contamination at 10^5 dilution
pH	6.5-7.5 for moist/dry powder, granulated carrier based and 5.0 – 7.5 for liquid based
Particles size in case of carrier based material	All material shall pass through 0.15-0.212mm IS sieve
Moisture % by weight	30-40% maximum in case of carrier based
Efficiency character	The strain should have phosphate solubilizing capacity in the range of minimum 30%, when tested spectrophotometrically. In terms of zone formation, minimum 5mm solubilization zone in prescribed media having at least 3mm thickness.

*Types of Carrier:- The carrier material such as peat, lignite, peat soil, humus, wood, Charcoal or similar material favouring growth of the organism.
PSB Bio Fertilizer Target crops: Cereals (Wheat, Paddy, Maize, Barley),Pulses(Soybean, Green gram, Chickpea, Black gram, Pigeon pea Pea), Oil seeds (Sunflower, Ground Nut, Mustard, Coconut, Safflower), Fibrous(Cotton, Jute), Vegetables, Fruit and Plantation crops

Seed Treatment – Apply 10 ml PSB Bio Fertilizer in 1.0 kg of seeds and add sufficient quantity of water. Mix the entire seed with prepared mixture for coating the seeds, dry under shade and sow the seed at early morning or late evening.
Soil Treatment – Apply 500ml – 1 lit. /acre PSB Bio Fertilizer in 50kg well decomposed Fym/compost/vermi compost/field soil thoroughly and broadcast in the field before sowing/planting or in the standing crop.
Seedlings Treatment – Mix 100 ml Bio Fertilizer PSB in 10 lit. of water and dip the seedlings root for 20 – 30 minutes before transplant the seedling.

Soil Treatment – Apply 4 kg/acre PSB Bio Fertilizer in 50kg well decomposed Fym/compost/vermi compost/field soil thoroughly and broadcast in the field before sowing/planting or in the standing crop.
Incompatibility: Avoid treating the seed with Antibiotics.

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