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ISSN : 2456-8643

Title:
SOIL PROPERTIES AS INFLUENCED BY INTERACTION OF CRUDE OIL POLLUTION LEVELS WITH PLANT SPECIES IN THE TROPICAL RAIN-FOREST BELT, NIGERIA

Authors:
Christiana James Ijah , Otobong Benjamin Iren and Anthony Egrinya Eneji

Abstract:
A study was conducted at the screen house of the Teaching and Research Farm of Akwa Ibom State University, to evaluate the effects of crude oil pollution levels grown with different native plant species on some physicochemical properties of the soil. A 13 x 4 factorial comprising of twelve varieties of native plant species (Axonopus compressus, Pennisetum purpureum, Eleusine indica, Panicum maximum, Leuceana leucocephala, Gliricidia sepium, Talinum fructicosum, Chromoleana odorota, Cyperus rotundus, Calapogonium mucunoides, Jatropha curcas, Centrosema pubescens) and a control, polluted with four levels (0, 2.5, 5.0 and 7.5 %) of crude oil (w/w) were fitted into Completely Randomized Design with three replications. Significant interactions were observed between crude oil pollution levels and different plant species used on the soil chemical properties while there was no significant effect on the texture of the soil irrespective of the plant species used. Different plant species interact differently in crude oil polluted soils. At 2 and 4 months after crude oil pollution, increase in crude oil pollution level significantly (P < 0.05) decreased the values of soil pH, available phosphorus, exchangeable bases and effective cation exchange capacity (ECEC) while organic carbon, total nitrogen and base saturation were significantly (P < 0.05) increased relative to the control (unpolluted soil)

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