Indonesian Journal of Oil Palm Research Volume 24 Number 2 Year 2016 is published by presenting articles Suspected symptoms of deep-seated depression and homozygosity levels of self-pollinated palm oil population generation 4 SP540T and 5th generation Dura Deli, (Elaeis guineensis Jacq.) of eight varieties of PPKS, Optimization of DNA extraction protocol Elaeidobius kamerunicus, Relation of rainfall patterns and oil palm plant performance on Sumatra Island and Kalimantan during El Niño 2015, Development of utilization of avocado seed extract (Persea americana Mill .) to decrease the content of free fatty acids (ALB) in crude palm oil.