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 berries Features NutriBond 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