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. 2016 Aug 25;4:e2385. doi: 10.7717/peerj.2385

Figure 2. Ryegrass growth response effect size as a function of biochar addition rate.

Figure 2

The relative effect size (response ratio–RR) of biochar treatment for aboveground biomass (A), belowground biomass (B), and leaf area (C) of ryegrass, as a function of biochar addition rate. Effect size is calculated as RR = ln(B/C), where B is mean response of the biochar treated plants, and C is the mean response of the non-biochar treated control plants. Regressions were performed for each biochar type (MB, SB, MFT); significant linear relationships are denoted with asterisks (P = < 0.05*, < 0.01**, 0.001***).