Influence of Soil Particle Size and Arbuscular Mycorrhizal Fungi (AMF) in the Performance of Phaseolus vulgaris Grown under Crude Oil Contaminated Soil
Journal Title: Universal Journal of Environmental Research and Technology - Year 2013, Vol 3, Issue 2
Abstract
Biotic processes represent the major route responsible for the ecological recovery of hydrocarbon contaminated sites. An experiment was conducted to assess the influence of soil textural class and arbuscular mycorrhizal (AM) fungi in the performance of Phaseolus vulgaris under crude oil contaminated soil. Three soils of different textural class viz: clay loam soil (clay 52%), sandy clay soil (clay 30%), sandy loamy soil (clay 8%) were used to grow P. vulgaris under 2%, 4% and 8% (v/w) crude oil contamination. The experimental units were biostimulated with 2 g NPK fertilizer pot-1 and were inoculated with 12 g AM inoculum pot-1. Non inoculated pots served as control. The results obtained showed that AM inoculated pots recorded higher and significantly (P<0.05) different dry matter yields and chlorophyll content than non AM inoculated pots. Residual total petroleum hydrocarbon (TPH) increased as percent crude oil contamination increased at each soil textural class. Total petroleum hydrocarbon decomposition and removal was highest at 52% clay textural class (2.57mg/g) and significantly differed from 30% clay (3.26 mg/g) and 8% (4.26 mg/g). With AM colonization, physiological characteristics of P.vulgaris and TPH decomposition improved. This is evinced by the linear regression analysis between colonization and TPH (R2=0.77).
Authors and Affiliations
Chris O. Nwokoa, Peter N. Okekea and Princewill C. Ogbonnab
Keywords
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