Earth Science, 25 LB, 5,000 SQFT Coverage, Fast Acting Sulfur, High Quality Sulfur Lowers pH In High Alkaline Soil, Releasing Existing Nutrients & Fertilizers So They May Be Taken Up By The Roots To Feed The Plants, Excellent For Acid Loving Plants Such As Azaleas, Rhododendrons & Berry Plants, Includes Nutri-Lock Technology Which Holds Nutrients In Place For Maximum Effectiveness & Reduction Of Nutrient Run Off, Contains A Rich Source Of Calcium Essential For Plants To Better Take In Nutrients.