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. 2019 Feb 8;7:e6403. doi: 10.7717/peerj.6403

Figure 4. Boxplots illustrating differences in group averages regarding (A) operational taxonomic unit (OTU) richness, (B) Shannon index (H’) and (C) Simpson index (1/D) in the roots of maize and soybean at 6 weeks after sowing.

Figure 4

Bold horizontal lines represent median values; box margins ± SE and vertical lines represent minimum and maximum values of the groups. 1) Different letters in the maize or soybean plot among the cover crop treatments show a significant difference according to Tukey’s test at the 5% level. 2) R.M, V.M, M.M and F.M show the OTU diversity of maize after Italian ryegrass, hairy vetch, brown mustard cropping or bare fallow, respectively. R.S, V.S, M.S and F.S show the OTU diversity of soybean after Italian ryegrass, hairy vetch, brown mustard cropping or bare fallow, respectively.