Gypsum is is hydrated calcium sulfate (CaSO4•2H2O), a naturally occurring chemical compound and valuable soil amendment.

All of our gypsum products are OMRI-approved for use in organic agriculture:

  • Cal-CM Plus, Ag Grade Gypsum  
  • Cal-CM Plus, Solution grade gypsum


  • Supplies essential calcium and sulfur for plant cellular strength and uptake
  • Improves soil structure and aeration
  • Decreases soil compaction
  • Amends, conditions and reclaims soils high in sodium and magnesium
  • Enhances microbial activity

Gypsum is water soluble at the rate of 0.205 grams in 100 grams of water. It can be used on any irrigated cropland and is available in various formulations:

Beware of recycled gypsum, which can contain toxic chemicals.

Gypsum is sold in truckload quantities only. Call 855-894-1782 for a quote or email us.