YOANMA, A. D.; HARYANTO, A.; OKTAFRI, O.; TRIYONO, S. Effect of Coconut Shell Biochar Application on the Effectivity of NPK Fertilizer in Red Onion (Allium ascalonicum L.) Cultivation. Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering), [S. l.], v. 11, n. 1, p. 1–14, 2022. DOI: 10.23960/jtep-l.v11i1.1-14. Disponível em: https://jurnal.fp.unila.ac.id/index.php/JTP/article/view/5092. Acesso em: 26 nov. 2025.