Bridgewell Agriculture PAR4® AFEGYPCMPSPR50B Standard Prilled Calcium Sulfate (Gypsum) 50 lbs - PAR4® Prilled Calcium Sulfate (Gypsum) starts with premium quality, finely ground, mined material combined with lignin sulfonate, a water-soluble binding agent used to promote fast prill breakdown after application. PAR4® Prilled Calcium Sulfate (Gypsum) supplies plant-available sulfate sulfur plus calcium, nutrients which are essential for soil and plant health without affecting soil pH. Calcium is vital for the strength and resilience of cell walls, root growth and stress tolerance. It can be used to counteract excessive amounts of sodium and magnesium in soils.