Finalis ER, Sri Djangkung SM, Arfiana, Noor I, Suratno H, Rosyadi E, et al. Development of Carbon Based NPK Slow Release Fertilizer using Biochar from Oil Palm Empty Fruits Bunch. IJE [Internet]. 2020 Feb. 28 [cited 2025 Jul. 7];3(1):19-24. Available from: https://ije-pyc.org/IJE/article/view/45