Department of Agricultural Education, Faculty of Agricultural Sciences, Botswana College of Agriculture, Botswana. International Journal of Manures and Fertilizers, [S. l.], v. 1, n. 1, p. 199–207, 2012. Disponível em: https://ijpp.org/journal/index.php/ijmf/article/view/283. Acesso em: 23 mar. 2026.