I. G. Okoro, A. O. Babalola, J. K. Adesodun, A. M. Gbadebo, and O. I. Nwachukwu, “Biochar and poultry manure application effects on selected soil chemical properties and bioaccumulation of heavy metals in maize plant cultivated on degraded soils”, Direct Res. J. Agric. and Food Sci., vol. 13, no. 1, pp. 46–55, Feb. 2025, Accessed: Aug. 14, 2026. [Online]. Available: https://www.journals.directresearchpublisher.org/index.php/drjafs/article/view/31