A. Kusumastuti, M. Same, Nurhasanah, A. M. H. Zuhdi, and D. L. . Mar’ah, “Second-Year Biochar Residue and NPK Fertilizer Effects on Soil Mesofauna and Microbial Activity in Patchouli (Pogostemon cablin Benth.)”, Acta Solum, vol. 4, no. 2, pp. 100–109, Mar. 2026.