“Comparative Assessment of the Levels of Some Metal Ions in Soil Rhizosphere of Onion and Onion Bulb (Allium Cepa L) Cultivated in Danbam Local Government Area: North East Nigeria”. Communication In Physical Sciences 7, no. 1 (March 29, 2021). Accessed August 10, 2026. https://journalcps.com/index.php/volumes/article/view/419.