Lilly Miller 20 lb. Ammonium Sulfate. It is a straight nitrogen fertilizer that can be used on lawns and gardens. It has a nitrogen content of 21%, a phosphorus content of 0%, and a potassium content of 0%. It has a fast release time and can feed lawns for up to 6 weeks. It has a maximum coverage area of 4000 square feet and a waiting period to seed of 8 weeks.