Water resources scarcity is an important factor limiting agricultural development in arid and semi-arid areas. In addition, arid and semi-arid regions are often accompanied by soil salinization. This suggests that water-saving irrigation is necessary in salinized soils. Regulated deficit irrigation (RDI) is an important water-saving irrigation technology. However, for tomato, which has prolonged flowering period and whose yield and quality are both sensitive to water deficit and salt stress, RDI regime for stabilizing yield and improving quality needs to be further explored, especially for salinized soils. In this study, two soil salinity treatments: S3 (mixed salt was added to the soil at 3 g Kg−1 dry soil) and S5 (mixed salt was added to the soil at 5 g Kg−1 dry soil), and two RDI treatments: W1, 60 % θf was set as the upper limit of soil water content during the reproductive growth period; W2, 60 % θf was set as the upper limit of soil water content during fruit ripening. The effect of RDI on water consumption, fruit yield and fruit quality of tomato was studied in mildly and moderately salinized soils. The effect of the period water deficit suffered by fruits in salinized soils on their weight and quality was quantified. Clarified the effectiveness of the single crop coefficient approach in the application of RDI for tomato in salinized soils. Water productivity (WP), fruit dry weight (DW), tatal soluble solids (TSS), sugar-acid ratio (SAR), lycopene (Ly) and color index (CI) of tomato were obtained under different RDI scenarios in salinized soils based on tomato flowering pattern, single crop coefficient approach and quantitative relationship between the period water deficit suffered by fruits and their weight and quality. Different RDI scenarios were evaluated to determine the optimal RDI regime through the CRITIC-TOPSIS integrated evaluation method using tomato WP, DW TSS, SAR, Ly, and CI as evaluation indexes. The results of the CRITIC-TOPSIS comprehensive evaluation showed that water deficit carried out 45–75 days after flowering facilitates water saving and quality improvement with yield assurance in mildly and moderately saline soils.

中文翻译：

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基于单个果实重量和品质对缺水持续时间响应的调节亏缺灌溉制度研究：番茄案例研究


水资源稀缺是制约干旱和半干旱地区农业发展的重要因素。此外，干旱和半干旱地区通常伴随着土壤盐碱化。这表明在盐渍化土壤中，节水灌溉是必要的。调节亏量灌溉 （RDI） 是一种重要的节水灌溉技术。然而，对于开花期延长且产量和质量对水分亏缺和盐胁迫都敏感的番茄，需要进一步探索稳定产量和提高品质的 RDI 机制，尤其是对于盐渍化土壤。在本研究中，两种土壤盐分处理：S3（在 3 g Kg−1 干土中加入混合盐）和 S5（在 5 g Kg−1 干土中加入混合盐），以及两种 RDI 处理：W1,60 % θf 被设定为生殖生长期土壤含水量上限;W2， 60 % θf 被设定为果实成熟过程中土壤含水量的上限。研究了 RDI 对番茄耗水量、果实产量和果实品质的影响 轻度和中度盐渍土壤。量化了盐渍土壤中水果缺水时期对其重量和质量的影响。阐明了单一作物系数方法在盐渍化土壤中对番茄 RDI 应用的有效性。基于番茄开花模式、单一作物系数法和果实缺水期与重量和品质之间的定量关系，在盐渍化土壤中，在不同RDI情景下获得番茄的水分生产力（WP）、果实干重（DW）、塔尔可溶性固形物（TSS）、糖酸比（SAR）、番茄红素（Ly）和色度指数（CI）。 以番茄 WP、DW TSS、SAR、Ly 和 CI 为评价指标，通过 CRITIC-TOPSIS 综合评价方法评估不同的 RDI 情景以确定最佳 RDI 方案。CRITIC-TOPSIS 综合评价结果表明，开花后 45-75 天进行的缺水有助于节水和提高质量，同时在轻度和中度盐渍土壤中保证产量。