EKPO, Timothy; EKPO, Nse. Soil Fertility Maintenance In Niger Delta Region Of Nigeria: Issues, Trends And Challenges: Academic Discourse: An International Journal, Volume 9, No. 1. Afrischolar Discovery Repository (Annex), [S. l.], p. 283–291, 2016. DOI: 10.60951/afrischolar-488. Disponível em: https://publications.afrischolar.net/index.php/home/article/view/488. Acesso em: 29 jan. 2026.