Fig. 2. Midday canopy water potential (_C) simulated (lines) and measured (symbols) in sorghum during the growing seasons of (a) 1998 and (b) 1999 under control wet, free air CO₂ enrichment (FACE) wet, control dry, and FACE dry treatments. Arrows indicate dates of irrigation in wet and dry treatments. For irrigation schedules, see Table 1. Measured data from Wall et al. (2001b).