Shaw markets agricultural gypsum in a partnership with National Gypsum. Produced from fine screenings, agricultural gypsum is used as a soil amendment and is a source of both calcium and sulphur. Gypsum improves the structure of fine, textural soils, without altering the soil pH balance. The solubility of gypsum is 100 times greater than limestone of equal fineness. It improves the chemical composition of saline soils and does not contain Magnesium.
Agricultural gypsum is blue-grey in colour, loose, granular, and uniformity graded with particles ranging from 3/8″ to dust. It is always available in bulk and is applied directly to agricultural land by a mechanical spreader.