Microbial Strains & Biological Function
Bio-fertilizers contain live or latent beneficial microorganisms that colonize the rhizosphere or interior of plant tissues. Unlike synthetic fertilizers that supply direct chemical salts, biofertilizers mobilize locked nutrients organically.
Formulations are governed under Schedule III of the Fertilizer Control Order (FCO), 1985, which specifies minimum viable colony forming units (CFU count) and zero pathogenic contaminants.
- Nitrogen Fixers: Azotobacter (free-living in non-legumes) and Rhizobium (symbiotic in pulse root nodules)
- Phosphate Solubilizing Bacteria (PSB): Bacillus and Pseudomonas species that solubilize fixed tricalcium phosphates
- Potash & Zinc Mobilizers: Frateuria aurantia and zinc-solubilizing bacterial strains mobilizing soil minerals
- Vesicular Arbuscular Mycorrhizae (VAM): Fungal hyphae that extend root reach by up to 100 times for moisture and phosphorus
Soil Application, Seed Treatment & Fertigation
Microbial inoculants must be applied correctly to ensure bacterial survival. They are distributed as carrier-based powders (lignite/peat) or advanced liquid formulations with extended shelf life.
Inoculate seeds in shaded areas using jaggery (gur) slurry as a natural sticking agent, or mix with well-rotted farmyard manure (FYM) or vermicompost for broad broadcast across moist fields.
- Seed Treatment: Mix 10 ml liquid or 50g powder per kg of seed with cool jaggery water; dry in shade before sowing
- Soil Enrichment: Mix 1 to 2 liters of liquid biofertilizer with 100 kg moist FYM; incubate for 5 days before broadcasting
- Drip Fertigation: Inject liquid formulations through drip irrigation during early morning hours in moist soils
- Avoid Chemical Contact: Never mix bio-fertilizers directly with chemical fungicides, insecticides, or raw chemical urea
Organic Certification & Environmental Benefits
Integrating bio-fertilizers into continuous cropping systems restores soil organic carbon, improves soil crumb structure, and reduces chemical fertilizer expenditure by 20% to 25%.
Formulations certified under the National Centre for Organic and Natural Farming (NCONF) and NPOP guidelines are fully compliant with zero-budget and certified organic export frameworks.
- Chemical Reduction: Safely replaces 20% to 25% of synthetic nitrogen and phosphatic fertilizer requirements
- Soil Structure: Bacterial exopolysaccharides aggregate soil particles, improving aeration and water holding capacity
- Regulatory Compliance: Verify valid FCO Form O certification and minimum viable bacterial counts on the container
Official source
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National Centre for Organic and Natural Farming (NCONF) ↗Related on KisanPe
Common questions
Why should bio-fertilizers be kept away from direct sunlight?
Direct sunlight and ultraviolet radiation kill live bacterial and fungal spores; bio-fertilizers should always be stored in cool, shaded spaces and applied during evening hours.
Can bio-fertilizers be mixed with chemical fungicides?
No, chemical fungicides will destroy beneficial fungi (like Trichoderma or VAM) and reduce bacterial viability; maintain at least a 24- to 48-hour gap between treatments.
What is the shelf life of liquid bio-fertilizers?
Modern liquid bio-fertilizers formulated with dormant spore-forming technologies typically have a shelf life of 12 to 24 months when stored below 30°C.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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