This study addresses water-saving irrigation strategies, including deficit irrigation (DI) at 70% and 50% crop evapotranspiration, ET c (DI70 and DI50, respectively), and partial root-zone drying (PRD) at 70% and 50% ET c (PRD 70 and PRD 50, respectively) to investigate the response of the tomato ( Lycopersicon esculentum L.) using a surface drip system in the field on a sandy loam soil during years 2017 and 2018. Full irrigation (FI) at 100% ET c was used as the control treatment. Results revealed that the soil water content values for the DI and PRD treatments were lower than those in the FI treatment. The net photosynthesis rate, stomatal conductance, and transpiration rate decreased with decreasing irrigation water, whereas the xylem abscisic acid content increased. A significant decrease in fresh and dry vegetative parts for DI and PRD treatments was detected compared to the FI treatment in 2017, whereas there were no significant differences in 2018. Both DI70 and PRD70 treatments had fresh and dry tomato yields similar to the ones in the FI treatment, whereas the corresponding yields were significantly lower under DI50 and PRD50 treatments. This resulted in a water productivity increase by, on average, 28.15% and 38.24%, for DI70 and PRD70 treatments, respectively, compared to the FI treatment. The DI and PRD treatments significantly affected the tomato fruit quality. Fruits under DI and PRD treatments accumulated higher amounts of total soluble solids, vitamin C, and titratable acidity compared to FI Fruits. Therefore, the use of water-saving practices is feasible for tomato production in areas where water supply is limited.

中文翻译：

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部分根区干燥和亏缺滴灌技术番茄土壤水分状况与生长

本研究涉及节水灌溉策略，包括 70% 和 50% 作物蒸发量的亏缺灌溉 (DI)、ET c（分别为 DI70 和 DI50）以及 70% 和 50% ET 的部分根区干燥 (PRD) c（分别为 PRD 70 和 PRD 50）以研究 2017 年和 2018 年期间在沙壤土上使用地表滴灌系统的番茄 (Lycopersicon esculentum L.) 的响应。100% 的全灌溉 (FI) ET c 用作对照处理。结果表明，DI和PRD处理的土壤含水量值低于FI处理。净光合速率、气孔导度和蒸腾速率随着灌溉水的减少而降低，而木质部脱落酸含量增加。与 FI 处理相比，2017 年检测到 DI 和 PRD 处理的新鲜和干燥营养部分显着减少，而 2018 年没有显着差异。 DI70 和 PRD70 处理的新鲜和干番茄产量与FI 处理，而在 DI50 和 PRD50 处理下相应的产量显着降低。与 FI 处理相比，DI70 和 PRD70 处理的水生产率平均分别提高了 28.15% 和 38.24%。DI和PRD处理显着影响番茄果实品质。与 FI 水果相比，DI 和 PRD 处理下的水果积累了更多的总可溶性固体、维生素 C 和可滴定酸度。所以，