UZOMA, A. O.. Urease Enzyme Activity in Surface Soils under Various Land use Types in Minna, Southern Guinea Savanna. Agricultural Extension Journal (AEXTJ), [S.l.], v. 3, n. 2, june 2019. ISSN 2521-0408. Available at: <http://aextj.com/index.php/aextj/article/view/146>. Date accessed: 18 sep. 2019.