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Summary of significant results for qPCR analysis, including the measure of nosZ gene density on day 90 (A) and relative abundance of nirS with respect to 16S rRNA on day 21 (B). Note the different y axes. Significant differences between treatments are represented by different lowercase letters. Furthermore, significant differences from the two-way ANOVA on ST treatments are depicted above panel B: *, P < 0.05; **, P < 0.01.
