Agricultural Gypsum (Calcium Sulfate – CaSO₄) is a versatile soil treatment that functions as an amendment, conditioner, and fertilizer. As a high-quality source of calcium and sulfur, it helps improve soil structure and fertility across a range of conditions. Ideal for heavy, waterlogged, or sodic soils, gypsum enhances the structure of clay-bound soils, promotes better drainage and root development, and supports long-term soil health and sustainability in both garden and field applications.
Key things we want you to know
Microna Prill Granular Gypsum Highlights
Adds essential calcium and sulfur nutrients with low dust for easy blending and precision application at reduced rates. Helps leach out harmful salts and improves soil structure. The micronized dihydrate form dissolves rapidly upon watering.
Certifications: CDFA Certified Organic Input Material, WSDA Organic Input Material
Guaranteed Analysis
- Calcium (Ca): 21%
- Sulfur (S): 17%
- Calcium Sulfate Dihydrate (CaSO₄·2H₂O): 92%
Suggested Application Rates
Use as directed by a Logan Labs soil analysis.
- Apply directly to the soil surface or into the seed furrow.
- The consistent size of the round prill allows for convenient blending with other dry amendments and even coverage.
- Accurate in variable-rate applications for commercial farms or home garden beds.
- Can be applied anytime during the year. While it is best to spread and water thoroughly afterward, only small amounts of moisture are necessary to activate the product.
- For building custom soil mixes, see our Water-Only Soil Recipe & Mixing Guide.