ISHS Acta Horticulturae 664: IV International Symposium on Irrigation of Horticultural Crops
EFFECT OF WATER STRESS INDUCED AT DIFFERENT GROWTH STAGES ON GRAPEVINE CV. CHARDONNAY ON PRODUCTION AND WINE QUALITY |
| Authors: | R. Ferreyra, G. Sellés, R.S. Ruiz, I.M. Sellés |
| Keywords: | Water use efficiency, Vitis vinifera, regulated irrigation deficit (RDI) |
| Abstract:
During growing seasons 1998/1999, 1999/2001 and 2000/2001 a field trial on irrigated grape vines cv. Chardonnay was carried out. The main objective was the evaluation of the effects of water stress on yield, wine quality, plant water status and nutritional reserves on roots. The following treatments were applied: T1, 100% of water evapotranspiration (Etc) all over the season; T2, 40% of Etc all over the season; T3, no irrigation since bud burst to veraison and irrigation at a 100% of Etc the rest of the season, until harvest; T4, irrigation of 100% of Etc since bud burst to veraison and no irrigation from then on up to harvest. Water shortage significantly decreased shoot growth and berry size. As a result yield reduction was observed. The growing period from bud burst to veraison showed the largest reduction in yield total acidity, global wine quality and phenols measured on the wine did not change with water stress, a different behavior as compared to red wines. Stem water potential (SWP), measured at noon, of plants under no water stress showed a higher SWP of – 0.8 Mpa as compared to those plants under water stress that showed -1.2 Mpa.. Finally, the water deficit induced a reduction of carbohydrate reserves of the root system. | |
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