Gypsum is primarily used a soil amendment that loosens up hard, compacted soil and allows water and plant roots to reach farther down into the soil profile. The biological systems also release and balance soil nutrients for the crop. gypsum is also an excellent source of sulfur and calcium for soils. A typical analysis for gypsum (dry weight basis) indicates GYPSUM supplies 22 percent calcium and 16 percent sulfur. For Indiana and Iowa growers.
Is gypsum a fertilizer?