amallya, Lutfia, and Siti Aisyah. 2026. “Analysis of Soil Heavy Metal Absorption With the Application of Biochar Based on Oil Palm (Elaeis Guineensis Jacq.) Frond Waste ”. JURNAL AGRONOMI TANAMAN TROPIKA (JUATIKA) 8 (3), 817 -. https://doi.org/10.36378/juatika.v8i3.5845.