Plants are frequently exposed to different biotic and a biotic environmental stress factors which exert detrimental effects on plant ecosystems. This study was carried out at the West African Portland Cement Co PLC (Lafarge) in Ogun state and Obajana Cement in Kogi state. A 500 x 500m plot was established in a forest at 50m and 3km distance to the cement factories. The parts of plant (bark and leaf) samples of the most abundant species from both locations were collected for chemical (Ca, Fe, K, Mg, N, C, P and Mn) composition examination using an atomic absorption spectrophotometer (AAS) Buck Scientific 210 VGP. Bark samples were taken at the height of 1.5m on the side of the trunk exposed to the cement factory, three samples from each tree. Analytical assessment of the parts of plants (bark and leaf) revealed that the analyzed elemental nutrients in both research locations are higher in concentration when compared with the reference locations (3km away from the research sites) with the exception of manganese in contrast presentation.
