Gaia Green Gypsum (Mined Calcium Sulfate) assists with breaking down and improving the structure of clay soils and hard pan, while providing an excellent source of sulfur and calcium for optimal plant nutrition and increase yields. Calcium is essential for most nutrients to be readily absorbed by your plants and will help stimulate root growth. Gaia Green Gypsum also helps treat alkaline soils, aluminum toxicity, improves water infiltration and helps to reduce runoff and erosion.