MINERALOGICAL AND CHEMICAL CHARACTERISTICS OF SPODOSOLS IN TOBA HIGHLAND, NORTH SUMATRA. Indonesian Journal of Agricultural Science, [S. l.], v. 10, n. 2, p. 54–64, 2016. Disponível em: https://epublikasi.pertanian.go.id/berkala/ijas/article/view/495. Acesso em: 11 sep. 2026.