Fig. 3. Mean water potential data for the 1985 nonirrigated plots from tensiometers and gypsum blocks; (a) water potentials for plots where soil rooting depth >0.50 m and (b) water potentials for plots with soil rooting depth <0.50 m. The symbols T and S indicate timing of 50% tasseling and silking respectively. The calibrated range of the gypsum blocks did not extend to matric potentials more negative than -1500 kPa.