THE EFFECT OF ZINC TREATED SOIL ON THE GROWTH AND DEVELOPMENT OF VERNONIA AMYGDALINA DEL. PLANT. FUDMA JOURNAL OF SCIENCES, [S. l.], v. 3, n. 2, p. 250–258, 2023. Disponível em: https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/1511. Acesso em: 8 sep. 2025.