Fig. 5. Response of plant biomass to CO₂ concentration, normalized to 330 µmol mol^-1 (rice, soybean, wheat) or 350 µmol mol^-1 CO₂ (Abutilon). Data for rice, soybean, wheat, and Abutilon are from Baker et al. (1990a), Allen et al. (1991), Neales and Nicholls (1978), and Dippery et al. (1995), respectively.

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