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Rock Phosphate
Mined phosphate mineral, mostly insoluble until solubilized by acid soil conditions or PSB inoculants. Long-term phosphorus building strategy for organic systems.
Quick Facts
Nitrogen (N)
0%
Phosphorus (P)
25%
Potassium (K)
0%
Microbial Activity
low
Cost / Acre
₹2,000-4,000
Shelf Life
Indefinite (mineral)
Application Guide
Rate: 1-2 t/ha (acid soils best), combine with PSB inoculant
Frequency: Once every 2-3 years
⚠️ Important Notes
- •Slow release — not for immediate P deficiency correction
- •Most effective in acid soil (pH below 6.5)