2025. The Effect of Giving NPK and Biochar from Palm Oil Fronds on Palm Oil Main Nursery Seedlings: NPK and Biochar from Palm Oil Fronds on Palm Oil Main Nursery Seedlings. TROPICAL WETLAND JOURNAL. 10, 2 (Jan. 2025), 19–29. DOI:https://doi.org/10.20527/twj.v10i2.132.