“THE EFFECT OF ZINC TREATED SOIL ON THE GROWTH AND DEVELOPMENT OF VERNONIA AMYGDALINA DEL. PLANT”. FUDMA JOURNAL OF SCIENCES 3, no. 2 (April 7, 2023): 250–258. Accessed September 8, 2025. https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/1511.