Pratiwi, G. R., & Nurrahma, A. H. I. (2024). Biochar and Humic Substances Roles for Nitrogen Transformation in Agriculture. Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering), 13(4), 1442–1452. https://doi.org/10.23960/jtep-l.v13i4.1442-1452