NPK high efficiency compound fertilizer. Executive standard: Total Index %N-P-K IndexPhysical ... from high quality soluble materials.apply through fertigation or foliar.2,20-20-20 general formula widely used on ... of crops/apple trees at different growing stages.3,Adding TE, chelated Iron, Copper,Manganese,and Zinc and soluble ... requirements.4,Other formulas are available upon your demand. NPK 10-10-15