MPOB F4 Premium is formulated based on the nutrient demand to ensure optimum utilization of nutrients to improve soil fertility for oil palm. The formulation is N:11 P2O5:6 K2O:22 MgO:2 and B2O3:0.5 + Organic + 5% Azomite. This well balanced fertiliser ratio is best suited for oil palm planted in various mineral soil especially in Sabah and Sarawak.