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 nutri-bond 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.