PENGARUH ZAT PENGATUR TUMBUH ALAMI DAN SINTETIK TERHADAP PERTUMBUHAN BIBIT KELAPA SAWIT (Elaeis guineensis Jacq) DI PRE NUSERY

Natural growth regulators can increase the growth of plant seeds. This experiment aims to obtain the best natural and artificial growth regulators for developing oil palm seedlings in the pre-nursery. The investigation was carried out in the experimental garden of the Faculty of Agriculture, Tamansiswa University, Padang, at a height of 7 m above sea level. The experiment starts from May-September 2022. This experiment uses a completely randomized design with treatments without growth regulators, tomato extract, coconut water, green bean sprout extract, atonic, and grow one. Each experimental unit was repeated four times so that there were 24 experimental units. The parameters observed were plant height, stem diameter, number of leaves per plant, leaf area, crown-to-root ratio, root length, number of roots, leaf color, and seedling normality. The results of the experiment can be concluded that using natural and synthetic growth regulators can increase the growth of oil palm seedlings in pre-nursery in terms of leaf area, root length, number of roots, and shoot and root ratio with the best growth regulator, namely tomato extract with a concentration of 10 ml/L.