Fig. 3. Belowground biomass in 1996 and 1997 of perennial peanut (PP) and bahiagrass (BG) grown under 360 or 700 µmol mol^–1 (indicated by ppm, mole fraction) CO₂ for comparison with Fig. 2C and 2D and Fig. 2G and 2H. Adapted from Boote et al. (1999).