ISHS Acta Horticulturae 646: International Symposium on Irrigation and Water Relations in Grapevine and Fruit Trees
EFFECT OF WATER STRESS APPLIED AT DIFFERENT DEVELOPMENT PERIODS OF CABERNET SAUVIGNON GRAPEVINE ON PRODUCTION AND WINE QUALITY |
| Authors: | R.E. Ferreyra, G.V. Selles, J.A. Peralta, J.B. Valenzuela |
| Keywords: | Water Stress, Cabernet Sauvignon grapevine, Stem Water Potential |
| Abstract:
Water stress treatments were applied to Cabernet Sauvignon vines during the 1994/95 and 95/96 seasons at La Platina Research Centre, Santiago (33º34’ S ; 70º38’ W). Treatments were 100% (control, T1); 40% (T2) of the crop evapotranspiration (ETc) during the whole season, no irrigation from budburst to veraison followed by 100% ETc until harvest (T3), and 100% ETc from budburst to veraison and no irrigation until harvest (T4). Stressed treatments (T2, T3 and T4) significantly reduced weight and size of berries. Yield was consequently reduced mainly when no water was applied between budburst and veraison (T3). In addition, floral induction was affected by water stress in the ongoing growing season. Wine colour intensity, phenols and anthocyanin concentration were higher in the stressed treatments, while acidity was increased when water stress was applied between veraison and harvest. T4 also increased the overall quality of wine. The Stem Water Potential (SWP) and Plant Water Stress Index (WSI) were adequate indicators of plant water status. SWP differences among plants with and without appropriate water supply were -0.6 MPa at sunrise and -0.5 MPa at noon. Unstressed plants showed SWP greater than -0.35 MPa at sunrise and -1.0 MPa at noon. Normally watered vines showed WSI lower than 0.2, from 0.2 to 1.0 when subjected to a partial water deficit, and grater than 1.0 when not irrigated in some phenological periods. | |
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