MAG-I-CAL® soil food for alkaline soils lowers soil pH. MAG-I-CAL® fine particles break-down quickly in the soil and is formulated for superior performance to help improve fertilizer efficiency. Your soil is considered alkaline if it reads between 7 to 14 on the pH scale. Standard fertilizer programs are not enough to get a beautiful lawn. They don't address the long term health of the soil, particularly soil pH. Plants growing with improper soil pH levels will not thrive because certain nutrients become tied-up in the soil and are unavailable to the plants. Lowering soil pH may take a number of applications to reach desirable levels. A gradual reduction in soil pH is preferred because a dramatic reduction can result in plant stress. Applying MAG-I-CAL® helps balance the soil pH and, at the same time, helps the lawn to grow greener and healthier.