Ammonium Sulfate is great source of Nitrogen with the acidifying addition of Sulfur. • Use on Alkaline soils and soils with higher pH. • Use on Trees, Shrubs, Flowers and Vegetables. • 3.25 lb. bag apply 1/2 lb. per 100 sq. ft. for lawns • 16 lb. bag - On Lawns - apply 1/2 lb. per 100 sq. ft. or 5 lbs. per 1,000 sq. ft. • 16 lb. bag will cover 4,000 sq. ft on lawn use • Water Generously After Application! This is the preferred fertilizer of Blueberries, providing the form of Nitrogen that they can use. Always read and follow label directions