Osadebe, A.U., Chikere, C.B. and Okpokwasili, G.C. 2023. Impact of Chronic Crude Oil Pollution on Nitrification in Edaphic Systems. Ecotoxicology and Environmental Contamination. 17, 2 (Mar. 2023), 50–63. DOI:https://doi.org/10.5132/eec.2022.02.07.