Thanks for the feedback, Christo, and you're right, 4-18-38 has no calcium. That's intentional. Calcium and phosphate react and lock each other up when combined, so a high-phosphate fruiting formula has to leave calcium out to keep the phosphate available. The calcium goes in separately. Our Cal-Mag Plus 2-0-0 is built for that, applied on a separate watering day from the 4-18-38, and that pairing is what prevents blossom end rot. Reach us at questions@greenwaybiotech.com if you'd like help with rates.