Used primarily as a nitrogen-sulfur fertilizer in agriculture, promoting healthy plant growth, especially in sulfur-deficient soils. Enhances crop yield in rice, wheat, and corn by providing essential nutrients. In laboratories, it serves as a precipitating agent in protein purification through ammonium sulfate fractionation. Commonly used in water treatment to remove impurities and as a flame retardant in wood-based products. Also found in some fire extinguisher formulations and as a food additive for dough conditioning in baking.