Synthesis of Nitrogen Slow Released Fertilizer Based Biochar Derived from Durian ShellChattreeya Booncharern, Teerat Boontha, Kulthida Thongnam and Duangkanok TanangteerapongE3S Web Conf., 620 (2025) 05001DOI: https://doi.org/10.1051/e3sconf/202562005001