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 |
Mr. Ali Al Hashim
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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. That’s why we call gypsum, saline soil amendment.
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. Agricultural gypsum is safe for nearly all crop types, including grains, vegetables, fruits, turf, and ornamentals. It supplies calcium and sulfur without altering soil pH, making it a gentle and reliable amendment. Read the article “Agricultural Gypsum Application For Different Crops“.
Results can appear within a few weeks, especially in improved soil structure and water infiltration. However, benefits such as reduced salinity, better root growth, and improved yield may take one to two growing seasons depending on soil conditions and climate. Read the article “How Quickly Does Gypsum Work?“.
Yes. Gypsum is compatible with most fertilizers and can be applied together in a single pass. It will not interfere with nutrient availability or change the chemical behavior of common fertilizers. Read the article “Agricultural Gypsum with Organic Fertilizers“.
No. Unlike lime, gypsum does not raise or lower soil pH. It improves soil structure and nutrient balance without altering acidity, making it suitable for a wide range of soils. Read the article “The amazing gypsum effects on soil physical properties“.
Gypsum is especially effective in:
Clay and heavy soils (improves structure and reduces compaction). Read the article “gypsum for clay soils“.
Sodic or saline soils (replaces sodium and improves permeability). Read the article “Gypsum effects on saline and sodic soils“.
Soils with poor drainage
Soils low in calcium or sulfur
Yes, although the benefits differ. In sandy soils, gypsum helps reduce nutrient leaching and provides a stable source of calcium and sulfur for crops. However, structural improvements are more noticeable in clay soils. Read the article “Gypsum in Sandy Soils“.
Most fields benefit from application every 1–3 years, depending on soil type, rainfall, and crop rotation. Sodic or saline soils may require more frequent applications during recovery. Read the article “Best time to apply gypsum for soil“.
Gypsum is generally safe, but excessive application may cause nutrient imbalances—especially magnesium or potassium. Soil testing helps determine the correct rate for your field. Read the article “Avoiding gypsum toxicity for agriculture“.
Yes. Gypsum is one of the most effective amendments for sodic soils. The calcium in gypsum replaces sodium on soil particles, allowing sodium to be washed away and improving soil permeability and root growth. Read the article “Agricultural Gypsum effects in Managing Soil Salinity“.
Natural agricultural gypsum is accepted in many organic farming systems. Always check local or national certification guidelines to verify compliance with your region’s standards. Read the article “Organic farming fertilizer“.
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.
