Indonesian Journal of Oil Palm Research Volume 27 Number 1 Year 2019 is published by presenting articles: Analysis of indonesia's market position in Refined Palm Oil (RPO) market in importer countries; The insecticide effect to the activity and emergence of Elaeidobius kamerunicus Faust (Coleoptera: Curculionidae) on oil palm (Elaeis guineensis Jacq.) male inflorescence; Genetic distance of 47 accessions of oil palm (Elaeis guineensis Jacq.) germplasm from cameroon based on morphological character; Impact of potassium and drought stress on nutrient uptake and production of palm oil (Elaeis gueenensis Jacq.) seedling biomass; and Phenological observation on eight oil palm (Elaeis guineensis Jacq.) varieties using thermal unit concept.