The aim of this research is to determine the exact dose of oil palm empty bunch (OPEB) compost and NPKMg fertilizer which produced the highest growth and yield of oil palm in Ultisol soil.The study suggestedeffect of composite oil palm empty bunches with cow manure (2:1(w/w)) and NPKMg (13:6:27:4) fertilizer that enriched with trace elements; boron, copper and zinc. The study used a completely …