What Is Ammonium Sulfate (21-0-0) Used For?

What You Need to Know

Ammonium sulfate provides 21% nitrogen and 24% sulfur while acidifying soil. Used for acid-loving plants (blueberries, azaleas, centipede grass), correcting alkaline soils, and providing nitrogen with sulfur supplementation. Less volatile than urea, doesn't require immediate watering

Apply 4.8 lbs per 1,000 sq ft for 1 lb of nitrogen. Popular choice for centipede grass and blueberry fertilization.

For personalized recommendations based on your specific garden size and fertilizer, use our fertilizer calculator.