G. C. Obiechefu and K. U. Emerson, “Changes in properties of tropical ferruginous soils under long-term fertility management and continuous cultivation”, ijeab, vol. 6, no. 4, Aug. 2021, Accessed: Dec. 04, 2024. [Online]. Available: https://journal-repository.com/index.php/ijeab/article/view/3987