EFFECT OF BIO FERTILIZER ON MATURE OIL PALM IN NORTH SUMATRA AND RIAU. Indonesian Journal of Agricultural Science, [S. l.], v. 7, n. 1, p. 20–26, 2016. Disponível em: https://epublikasi.pertanian.go.id/berkala/ijas/article/view/427. Acesso em: 11 sep. 2026.