SUMMARY
The productivity of oil palm is highly dependent on the application of fertilization. Fertilizer applications must pay attention to effectiveness and efficiency so that nutrients are absorbed optimally through the right time and dose. research to assess the effectiveness of fertilization time. This study aims to examine the effectiveness of oil palm fertilization which affects the productivity of fresh fruit bunches (FFB) and increases production income. The data used are secondary data including fertilization and productivity of FFB at intervals after fertilization for 6, 7, and 8 months in the Kujan Estate Division, PT Menthobi Makmur Lestari (MMaL), Kujan Village, Nanga Bulik District, Lamandau, Central Kalimantan Province. The data obtained were analyzed using MS software. Excel to describe the dose and time applied for 1 year and the productivity of FFB after 6 months of fertilization. Fertilizer application in months with high rainfall and the long dry season is less effective and efficient for nutrient availability. The productivity of FFB in the second semester after 6 months of fertilization has increased compared to the first semester. The effective application of fertilizers can increase the production of CPO and reduce the total cost of maintaining the oil palm company