... various period of plant-grow npk fertilizer : N+P2O5+K2O 15-15-1520-20-20, 19-19-19+TE, 16-16-16 ... -48-8, 10-52-1018-30-15, 10-40-10, 12-36-1210-10-40, 11-5-40, 15-10-30, 16-8-3213-13 ... -21+2MgO, 15-5-20+2Mg+6S13-15-15, 18-9-18 ... , 15-5-5, 12-5 ...