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Changes in nitrate (▵ and ▴) and ammonium (○ and ●) concentrations in agricultural soil amended with 300 μg of NH4+ N/g (dry weight) of soil in presence (▵ and ○) and in the absence (▴ and ●) of 4,000 μg of diesel fuel/g (dry weight) of soil. The error bars are smaller than the symbols. dw, dry weight.
