Fig. 2. Changes in gas-exchange WUE in 2003. Irrigation treatments were applied from 27 June through 8 September for the summer treatment period, and then again from 1 October to 1 November for the fall treatment period. (A) General changes in WUE in response to varying levels of deficit irrigation averaged across all three bentgrass species. Symbols indicate the irrigation treatment as a percentage of ET measurements using weighing minilysimeters. (B) General species changes in WUE averaged across the different levels of deficit irrigation. Vertical bars are LSD values (P 0.05) indicating statistically significant differences for irrigation and species treatment comparisons at a given day of treatment.