Indonesian Journal of Oil Palm Research Volume 31 Number 1 Year 2023 is published by presenting articles: Validation of Early Infection Markers for Ganoderma in Oil Palm at Three Endemic Ganoderma Locations, The Effect of Oil Palm Empty Fruit Bunch and Kernel Meal Composition as Black Soldier Fly Larvae (Hermetia Illucens) Feedstock on Driving the Changes in Larval Fatty Acids Composition, Improvement of Soil Chemical Properties and Growth of TM-1 Oil Palm with Combination of Inorganic-Organic Fertilizer and Asystasia gangetica (L.) T. Anderson as Cover Crop, Evaluation of Indigenous Plant Growth-Promoting Bacteria (PGPB) From The Oil Palm Rhizosphere in Oil Palm Nursery, and Social Sustainability Assessment of Oil Palm Smallholders Business Partnership and Its Relation to The Achievement of Sustainable Development Goals: Case Study in North Sumatra Province.