“EFFECT OF ORGANIC MANURE AMENDMENT SOILS ON UPTAKE OF Pb, Cd AND Zn IN SPINACH”. FUDMA JOURNAL OF SCIENCES 2, no. 2 (March 17, 2023): 157–162. Accessed September 11, 2025. http://www.fjsadmin.fudutsinma.edu.ng/index.php/fjs/article/view/1361.