Jonathan Green 18 lb. 5000 Sq. Ft. Coverage Mag-I-Cal Plus Soil Food For Acidic Soil. This natural soil food rapidly adjusts soil pH, helping to loosen heavy, hard-packed soils. It feeds and activates soil microbes, maximizing plant absorption of lawn food nutrients. Fortified with highly soluble calcium carbonate, fast-acting gypsum, humates, iron, and amino acids, this soil food corrects acidic soil and is safe for Bermuda grass. Use with any lawn food or annual lawn program and apply during the growing season when the soil is not frozen. Spread the product on a dry lawn soon after mowing.