In order to investigate the quantitative response of yield, fruit quality and economic return of table grapes grown in greenhouses under deficit irrigation applied at various growth stages, experiments were conducted in 2017 and 2018. Three irrigation levels (full irrigation, 2/3 and 1/3-full irrigation) were applied at the fruit setting–swelling (stage 2), veraison (stage 4) and whole growth stages. The comprehensive fruit quality index (Q_c) was determined in order to evaluate the overall quality of the berries and its effect on economic return. The results showed that deficit irrigation significantly decreased evapotranspiration (ET) and yield, and improved water use efficiency (WUE), individual quality parameters and Q_c. Fruit quality was more sensitive to water deficit at stage 4 than at stage 2. Significant linear functions were found between a relative decrease in yield, berry quality parameters, Q_c and a relative seasonal ET deficit. Net income under deficit irrigation was related to the price proportional coefficient (R). Higher net income was mainly determined by a higher yield when R was less than 1, while higher net income was determined by a higher Q_c when R was greater than 3. An appropriate water deficit level at stages 2 and 4 (F_2/3V_2/3) is recommended as an optimal treatment as it produces a higher Q_c, the highest WUE and net income without a significant decrease in yield.

中文翻译：

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在生长的各个阶段进行适当的亏缺灌溉可以保持产量，提高温室种植鲜食葡萄的综合果实品质和经济效益*

为了研究温室鲜食葡萄在亏缺灌溉下不同生长阶段的产量、果实品质和经济效益的定量响应，分别于 2017 年和 2018 年进行了试验。三种灌溉水平（全灌、2/3 和 1 /3-全灌）在坐果-膨大（第2阶段）、转色（第4阶段）和整个生长阶段施用。为评价浆果的整体质量及其对经济效益的影响，确定了综合果实质量指数（Q _{c ）。}结果表明，亏缺灌溉显着降低了蒸散量（ET）和产量，提高了水分利用效率（WUE）、个体质量参数和Q _c. 果实品质在第 4 阶段比在第 2 阶段对水分亏缺更敏感。在产量、浆果质量参数、 Q _c和相对季节性 ET 亏缺之间发现了显着的线性函数。亏灌净收入与价格比例系数（R）有关。当R小于 1 时，较高的净收入主要由较高的产量决定，而当R大于 3 时，较高的净收入主要由较高的Q _c决定。在第 2 和第 4 阶段适当的缺水水平（F _2/3 V _2/3 ) 被推荐为最佳处理，因为它产生更高的Q _c，最高的 WUE 和净收入没有显着下降的产量。