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The number of culturable microbes in S1 (control on day 1), S2 (control on day 22), S3 (crude oil-contaminated soil on day 22), S4 (diesel-contaminated soil on day 22), and S5 (gasoline-contaminated soil on day 22) determined at weekly intervals during 22 days. a Culturable bacteria; b culturable fungi. Error bars indicate the standard deviation of triplicate samples
