Fig 4. Concentrations of NH₄⁺ and NO₃^–, and N₂O percent saturation partitioned according to nitrification rates that are above or below 0.11 μg N L^-1 d^-1.

There are significant differences between the two rate groups for all analyses (NH₄⁺, NO₃^–, and N₂O; Wilcox-Mann-Whitney test, P <0.05). The boxplot and whiskers encompass 95% of the data observed, data points outside of the box and whiskers are outliers. The box itself represents the first and third quartiles, and the center line is the median [65].