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The purpose of this study was to evaluate the application dosage of oil palm empty fruit bunch and the most efficient application area in contributing to maintaining soil nutrients, especially bases K, Ca, Mg. This research was conducted at PT. Sawit Graha Manunggal (SGM), Paju Epat Subdistrict, East Barito Regency, Central Kalimantan Province, which has a dominant type of soil Spodosol (Typic plachortod). This research uses a factorial split-plot design with 2 treatment factors. The first factor is where the application of oil palm empty fruit bunches as the main plot consists of 2 levels, namely G1 = palm inter-row, G2 = palm circle. The second factor is the dose of oil palm empty fruit bunches as subplots consisting of 3 levels namely, E1 = 30 mt / ha, E2 = 35 mt / ha, E3 = 40 mt / ha. The analysis was carried out after the application of oil palm empty fruit bunches for five years. The results showed that the most efficient application site was in the oil palm inter-row and the best application of oil palm bunches was 30 mt / ha.

Dynamics of K, Ca, Mg in Spodosol Land that is Applied Oil Palm Empty Fruit Bunch on Oil Palm Cultivation Land (Elaeis guineensis Jacq.) In Central Kalimantan