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

Figure 2. Boxplots illustrating differences in group averages in aboveground plant biomass of maize (A) and soybean (B) at 6 weeks after sowing.

Figure 2

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 aboveground plant biomass of maize after cultivation of Italian ryegrass, hairy vetch, brown mustard cropping or bare fallow, respectively. R.S, V.S, M.S and F.S show the aboveground plant biomass of soybean after cultivation of Italian ryegrass, hairy vetch, brown mustard cropping or bare fallow, respectively. (A) Maize, (B) Soybean.