SEBAYANG, L. Efect of palm oil factory sludge manure on the growth and yield of cabbage. Jurnal Online Pertanian Tropik, [S. l.], v. 6, n. 3, p. 371–374, 2019. DOI: 10.32734/jopt.v6i3.3167. Disponível em: https://idjpcr.usu.ac.id/jpt/article/view/3167. Acesso em: 4 aug. 2025.