Solu-Cal 6-12-6 is a fortified blend of SOLU-CAL containing PHCA to ensure seedling development and increase turf vigor, reducing weed pressure. PHCA fortified starter enables SOLU-CAL 6-12-6 w/17% Ca. to perform like 12-24-12. 17% Calcium strengthens plant and enhances seedling vigor. The PHCA helps the plant take in more of the nutrients from the soil.