Jonathan Green 5000 sq. ft. Coverage Mag-I-Cal Plus Soil Food. It is a natural soil food for lawns that rapidly adjusts soil pH, helping to loosen heavy, hard-packed soils. This improves root penetration and promotes growth by increasing biological activity and releasing nutrients trapped in the soil. Fortified with calcium sulfate dihydrate, humic acid, fast-acting gypsum, and humates, it helps to lower soil pH to increase grass nutrient absorption. Safe to apply when seeding or sodding, it is best applied during the growing season when the soil is not frozen. Spread the product on a dry lawn soon after mowing.