The result of quantity and placement distances of inorganic 15-15-15 fertilizer in improving soil fertility and yield of maize in a tropical rain forest zone of Nigeria. International Journal of Manures and Fertilizers, [S. l.], v. 1, n. 1, p. 135–143, 2012. Disponível em: https://ijpp.org/journal/index.php/ijmf/article/view/267. Acesso em: 23 mar. 2026.