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The number of operational taxonomic units (OTUs) (A) and Shannon index (B) of pepper rhizosphere bacterial communities in different treatments. CK, no cover crop; W, wheat; R, wild rocket; B, faba bean; WR, wheat + wild rocket; WB, wheat + faba bean; RB, wild rocket + faba bean; and WRB, wheat + wild rocket + faba bean. Different lowercase letters in each column denote significant differences among the samples (p < 0.05; HSD Tukey test).
