Date palm (Phoenix dactylifera L.) growth and production in the arid regions is adversely affected by increasing soil and water salinities. Although many aspects of date palm nutrition, physiology, genetics, and many more are extensively researched, the evaluation of salinity impact on date palm growth and productivity are limited to short duration studies and/or focused mostly on the seedling stage. A large gap in understanding salinity impact on mature date palms is therefore very evident. A long-term experiment (2001–2016) was established in 2001 using eighteen local and regional date palm varieties from the Arabian Peninsula on 2.5 ha ^{to evaluate the impact of three levels of irrigation water salinity (5, 10 and 15} dS m^{−1 EC}W^{) on date palm productivity.} Eight years of yield data showed that fruit yield at Rutab and maturity stages was severely reduced at high salinity. Rutab fruit yield ranged from 67 to 146 kg tree-1 at low salinity (5 dS/m) while at the high salinity (15 dS m⁻¹ EC_w) yields ranged from 21 to 98 kg tree-1. At maturity, fruit yield reduction at the high salinity relative to the low salinity reached 67%. The 18 date palm varieties were widely different with regard to the impact of salinity on yield stability. Regression fitting and Principal Component Analysis (PCA) led to the identification of four different groups of date palm varieties in relation to salinity tolerance and thresholds. Group 1, including varieties Lulu and Barhi, are high-yielding varieties with high salinity tolerance; average salinity level at 50% yield reduction was 12 dS m⁻¹ EC_w. The second group includes the varieties Khisab, Sukkari, Jabri, Shahla, which are characterized as high-yielding varieties with sensitivity to increase in salinity, yield decline significantly at elevated salinity. Average salinity level at 50% yield reduction is 10 dS m⁻¹ EC_w. The third group includes varieties Fardh, Um Al Hamam, Naghal, Abu-Maan, Rhothan, which are characterized by medium to high yield potential under low salinity with moderate salinity tolerance. Average salinity level at 50% yield reduction is 9 dS m⁻¹ EC_w. The fourth group includes varieties Shagri, Khnizi, Nabtat Saif, Ajwat Al Madinah, Khalas, Maktoumi which demonstrate low yield potential with low salinity tolerance. Average salinity level at 50% yield reduction is 8 dS m⁻¹ EC_w. The present findings will provide a better understanding of the impact of salinity on date palm yield and guide future work on genetic enhancement and the development of integrated crop management approaches for date palm under marginal conditions.

海枣（Phoenix dactylifera L.）在干旱地区的生长和生产受到土壤和水盐度增加的不利影响。尽管对枣椰树营养、生理学、遗传学等许多方面进行了广泛研究，但盐度对枣椰树生长和生产力影响的评估仅限于短期研究和/或主要集中在幼苗阶段。因此，在理解盐分对成熟枣椰树的影响方面存在很大差距，这一点非常明显。2001 年建立了一项长期实验（2001-2016 年），在 2.5 公顷的土地上使用来自阿拉伯半岛的 18 个当地和区域枣椰树品种^{来评估三个灌溉水盐度水平（5、10 和 15} dS m ^-1欧共体_^{) 对枣椰树生产力的影响。}八年的产量数据显示，在高盐度条件下，芸香和成熟期的果实产量严重下降。在低盐度 (5 dS/m) 而在高盐度 (15 dS m ^-1 EC _w) 产量范围为 21 至 98 公斤 tree-1。成熟时，高盐度相对于低盐度减产达67%。18 个枣椰树品种在盐分对产量稳定性的影响方面存在很大差异。回归拟合和主成分分析 (PCA) 导致确定了与盐度耐受性和阈值相关的四组不同的枣椰树品种。1组，包括品种Lulu和Barhi，是耐盐性高的高产品种；减产 50% 时的平均盐度水平为 12 dS m ^-1 EC _w. 第二组包括Khisab、Sukkari、Jabri、Shahla等品种，这些品种是高产品种，对盐度升高敏感，盐度升高时产量显着下降。减产 50% 时的平均盐度水平为 10 dS m ^-1 EC _w。第三组包括 Fardh、Um Al Hamam、Naghal、Abu-Maan、Rhothan 等品种，其特点是在低盐度下具有中等至高产潜力，耐盐度适中。减产 50% 时的平均盐度水平为 9 dS m ^-1 EC _w. 第四组包括 Shagri、Khnizi、Nabtat Saif、Ajwat Al Madinah、Khalas、Maktoumi 等品种，这些品种表现出低产潜力和低耐盐性。减产 50% 时的平均盐度水平为 8 dS m ^-1 EC _w 。目前的研究结果将更好地了解盐分对枣椰树产量的影响，并指导未来在遗传增强方面的工作以及在边缘条件下开发枣椰树综合作物管理方法。