AKPAN, A.; UBONG, U. .; OKORI, B. . Effects of different organic manures and NPK fertilizer on soil properties. World Journal of Applied Science & Technology, [S. l.], v. 14, n. 2, p. 1–5, 2023. DOI: 10.4314/wojast.v14i2.1. Disponível em: https://www.ajol.info/index.php/wojast/article/view/247026. Acesso em: 15 oct. 2026.