Growth and Physical Quality of Oil Palm (<em>Elaeis guineensis</em> Jacq.) Pre-Nursery on Several Growing Media Fertilized with Organic Liquid Ecoenzyme

Oil palm nurseries generally have two stages: pre-nursery and main nursery. This nursery system requires a large amount of topsoil. To prevent damage to the topsoil ecosystem, this study used ultisol soil mixed with compost and cow manure as the M2, M3, and M4 nursery media. M1, using topsoil, served as a control. The pre-nursery oil palm seedlings grew to a height of 19.0-20.5cm, a stem diameter of 1.0-1.2cm, a leaf number of 4.0-4.3 strands. a root length of 21.6-25.0cm, a root volume of 3.5-3.7mL3, dry weight of stem+ leaves of 1.1-1.3g, and a root dry weight of 0.3-0.4g in M1, M2, M3, and M4 nursery media. The quality index of oil palm seedlings ranges from 0.06 to 0.08 in four types of nursery media. Pre-nursery oil palm seedlings grow and develop in four types media because these media contain 0.12-0.25% N, 10.81-81.81 ppm P2O5, and 0.19-0.35cmolkg-1 K. Ecoenzyme liquid organic fertilizer contains 0.20% N, 0.04% P, and 0.14% K. The best growth and physical quality of pre-nursery oil palm seedlings are in M2 media made from 70% ultisol soil mixed with 30% compost and 100 mL of ecoenzyme liquid fertilizer.