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Canonical correspondence analysis relating oligotypes and urea amendment concentration to abundance of nitrification genes at 21 days post-treatment. Relative abundance of the oligotype within the genus was used for analysis for (A) Nitrobacter, (B) Nitrospira, (C) Nitrosospira, or (D) Nitrososphaera. Only those oligotypes that showed significant Spearman correlations (P < 0.05) with nitrification genes are shown.
