Grapevine growing in areas with low rainfall as the Brazilian semi-arid requires irrigation to full fill plant water demand. The objective of this study was to evaluate the physiological and yield responses of grapevine to irrigation strategies in the Lower Middle São Francisco Valley, in Petrolina, State of Pernambuco, Brazil. The experiment was carried out over three consecutive growing seasons of drip irrigated 'Syrah' grapevine, grafted on 1103 Paulsen and planted in an Ultisol (Soil Taxonomy, USA). Full irrigation (FI), regulated deficit irrigation (RDI), and deficit irrigation (DI) treatments were designed in a randomized block with four replications. Mostly soil moisture depletion was observed until 0.6 m soil depth while higher moisture values and their small variation over the time were observed below 0.6 m and until 1.20 m depth as consequence of dense soil layers. RDI and DI promoted moderate water stress in plants (pre-dawn water potential from −0.2 to 0.4 MPa), reducing water consumption and gas exchange. Intrinsic water use efficiency was higher in RDI and DI (121 and 115 µmol CO₂ mol H₂0^−1, respectively). Tritratable acidity reduced to 5.81 and 6.28 g L⁻¹ tartaric acid as water deficit increased, except in the third season. Soluble solids were influenced by treatments only in the second season, when it decreased in FI plants (22.6° brix). Weight of 100 berries was influenced by treatments in all seasons, with lower values for DI and RDI grapevines (less than 155 g). Number (15) and weight (2.2 kg) of cluster per grapevine and yield (7284 kg) were significantly higher in FI only in the third growing season, while average cluster weight was greater in FI in the first and third seasons (84 and 149 g, respectively). Irrigation water productivity did not differ among irrigation strategies. Deficit irrigation strategies allowed water saving.

葡萄生长在降雨量低的地区，因为巴西半干旱地区需要灌溉才能充分满足植物对水的需求。本研究的目的是评估葡萄藤对巴西伯南布哥州彼得罗利纳中下圣弗朗西斯科河谷灌溉策略的生理和产量响应。该试验是在连续三个生长季节进行滴灌“西拉”葡萄藤，嫁接在 1103 Paulsen 上并种植在 Ultisol（土壤分类法，美国）中。全灌溉 (FI)、调节亏缺灌溉 (RDI) 和亏缺灌溉 (DI) 处理在随机区组中设计，重复四次。在 0.6 m 土壤深度之前观察到大部分土壤水分耗竭，而在 0.6 m 以下和 1 之前观察到较高的水分值及其随时间的微小变化。20 m 深，因为土层致密。RDI 和 DI 促进植物中度水分胁迫（黎明前水势从 -0.2 到 0.4 MPa），减少耗水量和气体交换。RDI 和 DI（121 和 115 µmol CO₂ mol H ₂ 0 ^-1）。Tritratable 酸度降低到 5.81 和 6.28 g L ^-1酒石酸随着水分亏缺的增加而增加，除了第三季。可溶性固形物仅在第二季受到处理的影响，当它在 FI 植物中下降（22.6° 白利糖度）时。100 个浆果的重量在所有季节都受到处理的影响，DI 和 RDI 葡萄藤的值较低（小于 155 克）。仅在第三个生长季节，FI 的每个葡萄藤的簇数 (15) 和重量 (2.2 kg) 和产量 (7284 kg) 显着更高，而 FI 的平均簇重在第一和第三个季节（84 和 149 g)。灌溉水生产力在灌溉策略之间没有差异。赤字灌溉策略可以节约用水。