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The number of nitrifying bacteria (log cfu/g dry soil) in soil treated with imidacloprid (C: control; FR: 1 mg/kg soil; 10∗FR: 10 mg/kg soil). The data presented are the means and standard deviations of three replicates. Different letters indicate significant differences (P < 0.05, LSD test), considering the effects of the pesticide dosage and time.
