21-0-0 Ammonium Sulfate Lawn Fertilizer21 0 0 Ammonium Sulfate Lawn Fertilizer 21 0 0 Ammonium Sulfate delivers 21% nitrogen and 24% sulfur in a free flowing granular form designed for sulfur deficient and alkaline soils. This non leaching formula is particularly effective for rice, wheat, and pastures while serving as an excellent choice for lawns, gardens, and ornamental plantings where phosphorus and potassium levels are already adequate. The ammoniacal nitrogen source resists leaching,