CalciSoil Agricultural gypsum is a mineral derived from natural gypsum rocks formed centuries ago. Being moderately soluble, it is a good source of essential macronutrients Ca (Calcium) and S (Sulfur). It is also an effective soil amendment as it can improve physical and chemical properties of soil. Chemically speaking, it is calcium sulfate dihydrate CaSO4 2H2O. Other common names: gypsum fertilizer, agricultural gypsum.
Features:
For use in agricultural crops (paddy rice, tomatoes, potatoes, groundnuts, mushrooms, corn, sugarcane etc. ). for lawn, turf, golf course and landscaping; for clearing muddy ponds and many others.
| Purity (CaSO4 2H2O) | 95% min |
| Calcium (Ca) | 23% |
| Sulfur (S) | 17% |
| Chloride (Cl–) | 0.1% max |
| Free Moisture | 1% max |
| pH | 6.7 |
| Solubility | 2.1 (sparingly soluble) |
| Crystal Water (CW) | 20.3 |
| Mesh size | 200 (ultrafine) |
| Color | Off- white |
| Molecular Formula | CaSO4 2H2O |
| Chemical Name | Calcium Sulfate Dihydrate |
| Specific Gravity | 2.30 g/m3 |
| Loose Bulk Density | 850 kg/m3 |
| Compacted Bulk Density | 1220 kg/m3 |
| CAS Number | 13397245 |
| HS Code | 25201010 |
| EINECS | 231- 900- 3 |
| Type | Mineral |
| Trademark | CalciSoil |
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Agricultural gypsum improves soil structure by loosening compacted layers and enhancing aeration and water infiltration.
This creates better conditions for root growth and overall crop development, especially in heavy clay soils.
Gypsum provides plants with readily available calcium and sulfur—two key nutrients for strong cell walls, chlorophyll formation, and protein synthesis.
It enriches soil fertility without altering pH levels, unlike lime.
One of the most significant agronomic benefits of gypsum is its ability to reduce soil salinity and sodicity.
The calcium ions in gypsum replace sodium ions on soil colloids, allowing sodium to be leached away by irrigation or rainfall.
This process improves soil permeability and reduces surface crusting, which are common problems in saline or sodic soils.
As a result, plants can access water and nutrients more efficiently, leading to higher yields and better soil health over time.
The ideal application rate of agricultural gypsum depends on soil texture and salinity level.
In most cases, 1–2 tons per hectare are sufficient for soil conditioning, while severely sodic soils may require up to 4 tons.
A soil test is recommended before application.
Apply gypsum before planting or during soil preparation for best results.
Spread it evenly across the field and incorporate it into the top 10–15 cm of soil.
It works effectively on clay and saline soils, improving structure and drainage over time.
Yes. It is non-toxic and suitable for a wide range of crops including fruits, vegetables, grains, and forage.
You may notice improved soil structure within a few weeks, but complete benefits often appear over one or two growing seasons.
Yes, but avoid mixing with ammonium-based fertilizers in storage to prevent chemical reactions.
No. Gypsum is neutral and does not significantly alter soil pH.
Agricultural gypsum is backed by decades of research from institutions such as the USDA NRCS, showing its effectiveness in reducing phosphorus runoff, improving soil aeration, and supporting sustainable farming practices. Farmers worldwide rely on gypsum for long-term soil health.
