Effect of cow dung manure and SP-36 fertilizer on the quality of patchouli oil (Pogostemon cablin Benth.) planted on UltisolSyarifah Renny Fauzi, Syakur and SyafruddinE3S Web Conf., 306 (2021) 05003DOI: https://doi.org/10.1051/e3sconf/202130605003