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Production and variation of total biomass. (A) Annual total biomass of five mixtures: M-1 (black points), M-2 (red points), M-3 (yellow points), M-4 (blue squares) and M-5 (green squares). Values are mean ± standard error. (B) Mean inter-annual CVs of annual total biomass per mixture. Values are mean ± standard error. Different letters indicate significant differences (P < 0.05). DM, dry matter.
