FIGURE 2.

Seasonal integrals of stem water potential (_siSWP) (A), stomatal conductance (_sig_s) (B), leaf net carbon assimilation (_siA_N) (C), and water use efficiency (_siWUE) (D) from Cabernet Sauvignon grapevines (clone FPS08), subjected to different replacements of crop evapotranspiration (25% ET_c, 50% ET_c, and 100% ET_c) for the 2019 and 2020 growing seasons in Oakville, CA, United States. Values represent means ± SEM (n = 6). Different letters indicate significant differences (p ≤ 0.05) between irrigation treatments and year according to two-way ANOVA followed by Duncan’s new multiple range test. ns and * indicate non-significance or significance at 5% probability level, respectively.