A natural potassium alternative
Glauconite has been used as a potassium fertilizer for over 100 years, and El-Gedida material meets the published fertilizer criteria.
Slow-release potassium
Lower solubility than KCl/K₂SO₄ means less leaching; release improves when mixed with compost.
Soil structure
Uniform grains, high cation exchange and pellet micropores raise water and nutrient retention.
No acidification or salinization
pH 6.71–7.59 and salinity 0.056–0.128 dS/m, far below nitrogen fertilizers (up to 12 dS/m).
Micronutrients
Supplies Fe, Mg and traces of Zn, Co, Ni, Mn that support metabolism and N-fixation.
Land reclamation
Suited to new sandy lands thanks to water and nutrient retention.
Optional thermal activation
Roasting with CaCl₂ at 750–850 °C converts K into leachable KCl.
Heavy-metal safety (ppm)
| Sample | Cu | Pb | Zn | Ni | As | Cd | Co | Cr |
|---|---|---|---|---|---|---|---|---|
| El-Gedida E | 3.7 | 2.0 | 86 | 15.4 | 2.4 | <0.1 | 25.8 | 110 |
| El-Gedida W | 2.4 | 0.3 | 208 | 30.7 | 2.2 | <0.1 | 28.0 | 130 |
| CFIA limit | 400 | 150 | 700 | 62 | 13 | 3 | 34 | 210 |
All eight elements in both El-Gedida samples are below the CFIA limits, so the Bahariya Oasis ore meets the CFIA heavy-metal specification. Agronomic performance still needs field trials on Egyptian crops.
From mine overburden to fertilizer
Turning mine overburden from waste into a fertilizer product.
Mining
Recover greensand during overburden stripping.
Comminution
Crush and grind to −1 mm; simple grain contacts ease liberation.
Sieving
Take the −250+125 µm cut and reject clay fines.
Quality control
Test K₂O, heavy metals, pH and salinity.
Products
Agri-K-Organic: natural K fertilizer and soil conditioner.
Get technical guidance for your soil and crop
Share your crop, soil type and area, and we will recommend a suitable program.