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. • Use on Lawns for a quick, long lasting green. Covers up to 5,000 sq ft. • Water in After Application! This is the preferred fertilizer of Blueberries, providing the form of Nitrogen that they can use. Always read and follow label directions