Indonesian Journal of Oil Palm Research Volume 28 Number 1 Year 2020 is published by presenting articles: Distribution of vascular bundles and physical properties analysis of variety DxP oil palm trunk based on various zones and trunk heights, Validation of zeatin analysis method using ultra high performance liquid chromatography (UHPLC) technique on oil palm (Elaeis guineensis Jacq.) In vitro culture study, The effect of exposure time of plant growth regulator to abnormality rate of oil palm clones, Characteristics of CO₂ emission on peatland under oil palm trees, and Application of cow manure to improve soil chemical characteristics and promote vegetative growth of oil palm (Elaeis guineensis Jacq.) seedling on sub soil media.