ADENIYAN, O.; OJENIYI, S. Effect of poultry manure, NPK 15-15-15 and combination of their reduced levels on maize growth and soil chemical properties. Nigerian Journal of Soil Science, [S. l.], v. 15, n. 1, p. 34–41, 2006. DOI: 10.4314/njss.v15i1.37444. Disponível em: https://www.ajol.info/index.php/njss/article/view/37444. Acesso em: 8 nov. 2026.