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Soil H2O% at depths of 5 to 25 cm (A) and 25 to 55 cm (B) in plots of maize growing under ambient (○) and elevated CO2 (•) during 2004 at SoyFACE. Each point is the mean (±se) of the replicate plots measured at that time (n = 4). C, The ratio of H2O% in elevated [CO2] compared to ambient [CO2] treatments, at 5 to 25 cm (dashed line) and 25 to 55 cm (solid line). P values indicate statistical significance of CO2 × time interaction effects.
