S. Idris, M. Adamu, M. M. Maiyaki, A. T. Mahmud, and M. A. Haruna, “ASSESSMENT OF PRODUCTIVITY STATUS OF VERTISOLS IN SUDAN SAVANNA ZONE OF NIGERIA”, FJS, vol. 3, no. 4, pp. 553–561, Apr. 2023, Accessed: Oct. 20, 2025. [Online]. Available: https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/1685