SIMAMORA, J.; MARPAUNG, P.; LUBIS, A. DETERMINATION TYPE OF ALLOPHANE ON ANDISOL IN DOLAT RAKYAT VILLAGE TIGA PANAH DISTRICT, REGENCY OF KARO. Jurnal Online Pertanian Tropik, [S. l.], v. 2, n. 3, p. 228–238, 2015. DOI: 10.32734/jopt.v2i3.2916. Disponível em: https://idjpcr.usu.ac.id/jpt/article/view/2916. Acesso em: 5 aug. 2025.