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Relative abundances of main nitrogen-fixing bacterial genera at tasseling (A) and flowering stages (B). Treatment's details were as in Table 1. L, M, and R represent the nitrogen-fixing bacterial genera belonging to free-living nitrogen-fixation, associative nitrogen-fixation and symbiotic nitrogen-fixation, respectively. Values are mean ± SD (n = 4). Asterisk (*p < 0.05) indicates significant difference according to Wilcox test.
