Severe Preveraison and Moderate Postveraison Deficit Irrigation Improves Berry Phenolics in Warm-Climate Pinot noir

Supplemental Table 1   Mean stem water potential (Ψ_stem) response to irrigation treatments during two phenological periods: from treatment imposition to veraison (preveraison), and from veraison to harvest (postveraison). Treatment means (and standard error [SE]) are calculated from pooled data encompassing five to six measurements for each period (n = 3 to 5). P values adjacent to means represent comparisons against WC treatment and are adjusted for multiplicity using Dunnett’s method. Trend analyses for preveraison deficit (ED) and postveraison deficit (LD) trends were conducted on treatments arranged according to water application and excluding dry control (DC) (i.e., ED: WC-ED75-ED50-ED25 and LD: WC-LD75-LD50-LD25), where WC is well-watered control: vines were irrigated at 100% vine evapotranspiration (ET_c) during both pre- and postveraison; the number within each treatment notation (75, 50, and 25) indicates the irrigation rate in % ET_c that the vines received either pre- (ED) or post- (LD) veraison. The vines were irrigated at 100% ET_c for the rest of the season. Breakdown of each pre- and postveraison treatment is detailed in Table 1. 

Supplemental Figure 1   Soil properties of the vineyard site. Data was obtained from the USDA-NRCS Web Soil Survey (https://websoilsurvey.sc.egov.usda.gov). Experimental blocks (B1 to B5) are marked with a red border. Block 1 (B1) was expanded to the right to show the assignment of irrigation treatments. Rectangles in the middle of each treatment plot indicate eight data vines. WC, well-watered control; DC, dry control; LD, late deficit; ED, early deficit. AWS, available water supply.

• 25-016.SupplementalData.pdf