Indonesian Journal of Oil Palm Research Volume 34 Number 1 Year 2026 is published by presenting articles: Growth Responses and Phosphate Nutrient Uptake of Oil Palm Nursery (Elaeis guineensis Jacq.) on Peat Media Applied Ameliorants and Biofertilizers, Implementation of YOLOv5 for Estimating the Number of Oil Palm (Elaeis guineensis Jacq.) Trees, The Ideal Age Composition in Oil Palm Plantation, The Effect of Water on The Changes in Physical, Chemical, and Microstructural Properties of Oil Palm Empty Fruit Bunch Biochar, and The Impact of Company Size, Beta, and ESG Ratings on the Efficiency of Palm Oil Companies Listed on the IDX during Crisis Periods.