Fig. 1.

Effects of ambient [CO₂] (400 μmol mol⁻¹, white bars) and elevated [CO₂] (800 μmol mol⁻¹, gray bars) treatments on the levels of mineral nutrients in soybean leaves and seeds. The asterisk means that the value at 800 μmol mol⁻¹ differs significantly from that at 400 μmol mol⁻¹ (P < 0.05).