ISSN: 2222-6990
Open access
Spent engine oil is the hydrocarbon product of crude oil and it is unsatisfactory for plant growth due to insufficient reaction of the soil and the microbes because of the displacement of air from spaces between soil particles This research looked at two major trees used as park plants (Azerdirachta indica and Gliricidia sepium) in Ogbomoso North environment of Oyo State. Leaf samples were collected from three different mechanic workshops and three different farmlands in the study area.
The leaf samples collected were analyzed using the following parameters, Weight of leaf, Stomata quantity, Leaf area, Leaf acidity and Leaf color difference.
The result of the analysis for Azerdirachta indica indicated that leaf weight of polluted trees had a higher average weight of 1.84mm2 compared to that of the unpolluted tree 1.75mm2. The leaf stomata (upper surface) of polluted trees had a higher average value 38mm-2. Results for leaf acidity indicated that unpolluted trees had a greater value of 0.142ug/g compared to the average acidity value of 1.423ug/g for polluted trees. Measuring the colour difference; Azerdirachta indica (A. Juss) on unpolluted site had the highest colour difference of 0.1566ug/g
The result of the analysis for Gliricidia sepium (Jacq.) indicated that leaf weight of polluted trees had a higher average weight of 2.81mm2 compared to that of unpolluted trees 1.42mm2. The leaf stomata (upper surface) of polluted trees had a higher average value of 58mm-2. Result s for leaf acidity indicated that unpolluted trees had a greater value of 0.142ug/g compared to the average acidity value of 1.423ug/g for polluted trees. Measuring the colour difference; Gliricidia sepium on unpolluted site had the highest colour difference of 0.1566ug/g. The generic composition of these trees may change over time due to the level of pollution recorded it is therefore recommended that the mechanics should build their workshops far away from trees and the general public should be educated on the danger of using the park plants medicinal purposes.
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