Jonathan Green 12201 MAG-I-CAL Soil Food for Lawns in Alkaline Soil, 15000 Sq.FtMAG I CAL Soil Food for Alkaline Soils lowers soil pH. MAG I CALs 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 14 on the pH scale. Standard fertilizer programs are not enough to get a beautiful lawn. They dont address the long term health of the soil, particularly soil pH. Plants growing with improper soil pH levels