为探究不同浓度赤霉素（GA₃）和萘乙酸（NAA）施用组合和施用次数对蓝莓果实发育和品质性状的影响，本试验以蓝莓品种‘珠宝’为试验材料，以清水处理为对照（CK），对盛花期蓝莓幼苗分别喷施25 mg/L GA₃、20 mg/L NAA、25 mg/L GA₃+20 mg/L NAA（GA₃+NAA），在幼果期和膨大期分别对各组果穗进行2次和3次重复喷施处理，测定处理后各组蓝莓的单果重、总酚和原花青素含量等。结果表明，NAA和GA₃处理提升单果重的效果优于GA₃+NAA处理；喷施2次GA₃+NAA可提高植物总酚、原花青素、可溶性糖和可溶性固形物含量，且效果优于单独喷施2次GA₃或NAA；NAA和GA₃+NAA处理降低可滴定酸含量的效果优于GA₃处理；喷施1次GA₃对蓝莓维生素C含量提升效果较佳。综上，喷施2次GA₃+NAA（25 mg/L+20 mg/L）有利于提升蓝莓果实品质。本文为蓝莓栽培中植物生长调节剂的科学应用提供参考。

To explore the effects of different application combinations and application frequencies of gibberellin (GA₃) and naphthylacetic acid (NAA) at different concentrations on the fruit development and quality traits of blueberries, the blueberry variety ‘Jewel’ was used as the experimental material, and water treatment was used as the control (CK). The blueberry seedlings at the full flowering stage were sprayed with 25 mg/L GA₃, 20 mg/L NAA, and 25 mg/L GA₃+20 mg/L NAA (GA₃+NAA), respectively. The fruits in each group clusters were repeatedly sprayed twice and three times respectively during the young fruit stage and the expansion stage. The indicators such as the single fruit weight, total phenol and proanthocyanidin content of blueberries in each group after treatment were determined. The results showed that the effects of NAA and GA₃ treatment in increasing the single fruit weight were better than those of GA₃+NAA treatment. Spraying of GA₃+NAA twice could increase the contents of total phenols, proanthocyanidins, soluble sugars and soluble solids in plants, and the effect was better than spraying GA₃ or NAA alone twice. The effects of NAA and GA₃+NAA treatments in reducing the content of titratable acids are superior to those of GA₃ treatments. Spraying GA₃ once had a better effect on increasing the vitamin C content of blueberry. In conclusion, spraying GA₃+NAA (25 mg/L+20 mg/L) twice was beneficial for improving the quality of blueberry fruits. This article provides a reference for the scientific application of plant growth regulators in blueberry cultivation.