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Abundances of Nitrobacter- (A) and Nitrospira-like NOB (B) of three soil fractions under different fertilizer treatments. Error bars represent standard error (n = 3) and are followed by a lowercase letter indicating a significant difference among three factions within each fertilizer according to the Tukey test (p < 0.05). T, fertilization treatment; A, soil aggregate size. ∗, indicate a significant difference at p < 0.05, ∗∗, indicate a significant difference at p < 0.01.
