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Heat stress, low mango yields and inconsistent fruit quality are main challenges for growers. Recently, licorice-root extract (LRE) has been utilized to enhance vegetative growth, yield, and tolerance abiotic stresses fruit trees. Potassium sorbate (PS) also plays a significant role in various physiological and biochemical processes that are essential for mango growth, quality and abiotic stress tolerance. This work aimed to elucidate the effects of foliar sprays containing (LRE) and (PS) on the growth, yield, fruit quality, total chlorophyll content, and antioxidant enzymes of 'Osteen' mango trees. The mango trees were sprayed with (LRE) at 0, 2, 4 and 6g/l and PS 0, 1, 2, and 3mM. In mid-May, the mango trees were sprayed with a foliar solution, followed by monthly applications until one month before harvest. The results showed that trees with the highest concentration (6 g/L) of LRE exhibited the maximum leaf area, followed by those treated with the highest concentration (3 mM) of PS. Application of LRE and PS to Osteen mango trees significantly enhanced fruit weight, Number of fruits.tree^-1, yield (kg/tree), yield increasing%, and reduced No. of sun-burned fruits compared to the control. LRE and PS foliar sprays to Osteen mango trees significantly enhanced fruit total soluble solids ˚Brix, TSS/acid ratio, and Vitamin C content compared to the control. Meanwhile, Total acidity percentage in 'Osteen' mango fruits significantly decreased after both LRE and PS foliar sprays. 'Osteen' mango trees showed a significant increase in leaf area, total chlorophyll content, total pigments, and carotenoids of leaf. Our results suggest that foliar sprays containing LRE and PS significantly improved growth parameters, yield, fruit quality, antioxidant content, and total pigment concentration in ‘Osteen’ mango trees. Moreover, the most effective treatments were 3mM KS and 6g/L LRE. LRE and PS foliar spray caused a significant increase in yield percentage by 305.77%, and 232.44%, in the first season, and 242.55%, 232.44% in the second season, respectively.

热胁迫、芒果产量低下与果实品质不稳定是种植者面临的主要挑战。近年来，甘草根提取物（Licorice-root Extract, LRE）已被应用于促进果树营养生长、提升产量并增强其非生物胁迫耐受性。山梨酸钾（Potassium Sorbate, PS）同样在芒果生长、品质形成与非生物胁迫耐受所需的各类生理生化过程中发挥关键作用。本研究旨在阐明喷施含甘草根提取物（LRE）与山梨酸钾（PS）的叶面肥对‘Osteen’芒果树生长、产量、果实品质、总叶绿素含量及抗氧化酶活性的影响。供试‘Osteen’芒果树分别设置0、2、4、6g/L的LRE喷施浓度，以及0、1、2、3mM的PS喷施浓度，于5月中旬首次喷施叶面肥溶液，之后每月喷施一次，直至采收前1个月停止。结果表明，喷施最高浓度（6g/L）LRE的芒果树叶面积最大，其次为喷施最高浓度（3mM）PS的处理组。与对照组相比，喷施LRE与PS可显著提升‘Osteen’芒果的单果重、单株果实数、单株产量（kg/株）、增产率，同时减少日灼果数量。与对照组相比，喷施LRE与PS可显著提升‘Osteen’芒果果实的总可溶性固形物含量（白利度˚Brix）、TSS/酸比值以及维生素C含量。同时，喷施LRE与PS可显著降低‘Osteen’芒果果实的总酸度百分比。供试‘Osteen’芒果树的叶面积、总叶绿素含量、总色素含量以及叶片类胡萝卜素含量均显著提升。本研究结果表明，喷施含LRE与PS的叶面肥可显著改善‘Osteen’芒果树的生长指标、产量、果实品质、抗氧化物质含量以及总色素浓度。此外，最为有效的处理为3mM山梨酸钾（KS）与6g/L LRE。喷施LRE与PS可使第一季产量分别提升305.77%与232.44%，第二季产量分别提升242.55%与232.44%。