Ammonium Sulfate 21-24 is a high-quality inorganic nitrogen-sulfur compound fertilizer, the classic agrochemical with fixed nutrient content of 21% total nitrogen (N) and 24% available sulfur (S), presented as white crystalline powder or granular solid. It features high water solubility, rapid nutrient release and easy crop absorption, suitable for all soil types especially sulfur-deficient acidic soils. Widely applied in grain, cash, fruit and vegetable crops, it supplies dual N-S nutrition, promotes crop growth and improves yield, a staple fertilizer for agricultural production with mature production process and stable quality.