Effects of the composition of poultry manure and rock phosphate on soil available and yield of maize and cowpea. International Journal of Manures and Fertilizers, [S. l.], v. 1, n. 1, p. 171–175, 2012. Disponível em: https://ijpp.org/journal/index.php/ijmf/article/view/272. Acesso em: 23 mar. 2026.