npk fertilizer 1. N+P2O5+K2O 2. NO3-N easily ... . match various period of plant-grow npk fertilizer : N+P2O5+K2O 15-15-1520-20-20, 19-19-19+TE, 16-16 ... 17-17 18-18-18, 12-12-17+MgO, 20-10-12+2MgO.30-10-10,22-5-19+TE ... 23-6-1025-5-10 , 25-7-7+2MgO, 20-10-10+2Zn10-55-10, 12-38-10, 12-48 ... -30, 16-8-3213-13-21+2MgO, 15-5-20+2Mg+6S13-15-15, 18-9-18, 15-5 ... -4-9+2Mg0, 16-16-8+2MgO Soluble npk fertilizer(20-20-20)