Grade Classification
Potassium nitrate for agricultural use is classified primarily by its purity, particle size, and intended application. Understanding these classifications helps select the most appropriate product for each situation.
Fertigation Grade (Multi-K)
This premium grade is designed for drip and sprinkler irrigation systems. Its main characteristics include:
- Purity greater than 99%
- Complete dissolution without residues
- Low insoluble content (<0.01%)
- Fine crystals for rapid dissolution
- Compatible with other soluble fertilisers
Granulated Grade
Designed for direct soil application, the granulated grade offers:
- Uniform particles of 2-4 mm
- Good distribution through spreaders
- Less dust during handling
- Gradual nutrient release
Foliar Application Grade
Ultra-fine formulation for leaf spraying:
- Micronised crystals
- Instant dissolution
- No nozzle clogging
- Certified purity for foliar use
Technical Specifications
| Parameter | Multi-K | Granulated | Foliar |
|---|---|---|---|
| Total N | 13.7% | 13.5% | 13.7% |
| K₂O | 46.3% | 45.5% | 46.3% |
| Max Cl | 0.03% | 0.5% | 0.02% |
| Max moisture | 0.1% | 0.3% | 0.05% |
| Insolubles | <0.01% | 0.05% | <0.005% |
Storage Recommendations
To maintain product quality, follow these storage guidelines:
- Store in a cool, dry place
- Keep away from combustible materials
- Protect from moisture and direct sunlight
- Use original sealed packaging
- Rotate inventory (FIFO)
Certifications and Standards
Quality agricultural potassium nitrate should meet several standards:
- Registration as a fertiliser in the country of use
- Batch analysis certification
- Complete production traceability
- Compliance with environmental regulations
Frequently asked questions
What grade of potassium nitrate should I use for fertigation?
For fertigation, use "Multi-K" or equivalent solubility grade, which has high purity and dissolves completely without leaving residues that could clog irrigation systems.
What is the difference between agricultural and technical grade?
Agricultural grade is formulated specifically for use on crops with purity levels appropriate for plants. Technical grade has higher purity but at a higher cost, generally unnecessary for agricultural applications.
Does potassium nitrate come in different particle sizes?
Yes, it is available in crystalline form (for fertigation), granulated (for soil application), and prilled (for specific applications). Particle size affects dissolution rate and ease of application.