FEBRIANTI, F.; ASRIDAWATI, S. The Role of Charcoal from Oil Palm Trunks for Improving Macro Nutrients Content of Corn (Zea mays, L.).: Peranan Arang Batang Kelapa Sawit dalam Peningkatan Kadar Hara Makro Tanaman Jagung (Zea mays, L.). JURNAL AGRONOMI TANAMAN TROPIKA (JUATIKA), v. 1, n. 2, p. 67-72, 4 Jul. 2019.