Rock Phosphate
Also known as: Phosphate Rock, Natural Phosphate Rock, Typical Grade: 28–40% P₂O₅ (varies by origin and beneficiation)
Rock Phosphate is a naturally occurring mineral fertilizer and the primary raw material for almost all commercial phosphate fertilizers. It is mined from sedimentary or igneous phosphate deposits and can be used either directly as a slow-release phosphorus source or further processed into higher-analysis fertilizers such as SSP, TSP, MAP, and DAP.
When applied directly, rock phosphate acts as a slow-release phosphorus fertilizer, particularly effective in acidic soils where it gradually becomes available to plants over time.
Technical Specifications
| Parameter | Unit | Typical Range / Value |
|---|---|---|
| Total Phosphate (P₂O₅) | % | 28–40 (commonly 30–34 after beneficiation) |
| Bone Phosphate of Lime (BPL) | % | 60–75 (depending on grade) |
| Calcium Oxide (CaO) | % | 45–52 |
| Moisture | % | ≤ 3–5 |
| Fluorine (F) | % | Typically 2–4 |
| Silica (SiO₂) | % | Variable (often 4–12) |
| Appearance | — | Grey, brown, or off-white powder or granules |
| Form | — | Powdered (fine ground) or granular |
| Water Solubility | — | Very low |
| Citric Acid / Formic Acid Solubility | — | Moderate (varies by origin and fineness) |
Typical Physical Properties
- Low water solubility — acts as a slow-release phosphorus source
- Best performance in acidic to neutral soils
- Available in finely ground powder (for maximum reactivity) or granulated form
- Natural product suitable for organic farming systems (certain grades)
Key Benefits
- Natural slow-release phosphorus — Provides a sustained supply of phosphorus over an extended period, reducing the need for frequent applications.
- Cost-effective long-term fertility — Economical source of phosphorus for building soil phosphorus reserves.
- Calcium contribution — Adds significant calcium to the soil.
- Suitable for organic agriculture — Many grades are accepted in organic farming systems as a natural phosphate source.
- Soil health support — Improves long-term soil fertility and can enhance microbial activity when used appropriately.
- Raw material versatility — Also used as feedstock for the production of phosphoric acid and concentrated phosphate fertilizers.
Recommended Applications
Direct application as fertilizer is most effective for:
- Acidic to neutral soils (pH < 7)
- Long-term soil phosphorus building programs
- Organic and sustainable farming systems
- Perennial crops, pastures, orchards, and plantations
- Situations where a slow, steady phosphorus supply is preferred
Less effective in:
- Highly alkaline or calcareous soils (low solubility and availability)
- Crops requiring rapid, immediate phosphorus supply (prefer water-soluble sources such as MAP, DAP, or TSP)
Application Methods:
- Broadcast and thoroughly incorporated into the soil before planting
- Finely ground powder for higher reactivity
- Granular form for easier handling and reduced dust
- Often mixed with organic matter or compost to improve availability
- Rates based on soil tests, crop needs, and desired residual effect (typically higher than soluble phosphate fertilizers)
Packaging Options
- 25 kg or 50 kg bags
- 500–1,000 kg (or larger) jumbo bags (FIBC)
- Bulk (loose) delivery by truck, rail, or vessel for large-scale operations
Storage & Handling Recommendations
- Store in a cool, dry, well-ventilated area protected from moisture.
- Keep bags sealed and stacked on pallets.
- Finely ground material can generate dust — use appropriate personal protective equipment (dust mask, gloves, eye protection).
- Avoid prolonged exposure to high humidity.
Summary
Rock Phosphate is a natural, slow-release phosphorus fertilizer and the fundamental raw material of the phosphate industry. Its gradual nutrient release, calcium content, and suitability for organic systems make it a valuable option for long-term soil fertility management, particularly in acidic soils and sustainable farming practices.
For commercial inquiries, current availability (powder or granular), origin details, or technical data sheets, please contact us.
Contact: +91-9999999538, +91-9999099538 (WA), +91-9999156157 (WA) | Email: [email protected]
