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Fig. 1. Quantification of above ground weed biomass in three general categories, (C₃ broadleaf, C₄ broadleaf and C₄ grass) when grown at ambient and elevated (+250 µmol mol^–1) [CO₂] in Round-up Ready soybean without glyphosate application in 2004. Variation for a given weed category was tested by a one-way ANOVA, with three replicates. *, P < 0.05; **, P < 0.01; ***, P < 0.001.