Figure 1. (A) Net photosynthetic rates and (B) stomatal conductance values obtained during the reproductive period for both container- and ground-grown soybean in open-top chambers. Bars are ± SE, and the smooth lines are the quadratic fit of the data with the coefficients given in Table 2. Treatments were all charcoal-filtered air (CF) with plants grown in the ground (G) or in 21 L containers (C) at current ambient (370 µmol CO₂ mol^–1 air) or elevated (700 µmol CO₂ mol^–1 air) CO₂ concentrations.