关键词: 轮台白杏; 调环酸钙; 枝叶生长; 光合效率; 果实品质

Abstract: 【Objective】 The aim of this project is to study the regulation of prohexadione calcium on fruit tree development of 'Luntaibaixing' apricot and provide data references for the regulate technology development on vegetable growth and fruit quality of the apricot.【Method】 Ten days after flowering, the branches were treated with 100,125,150, 175 mg/L prohexadione calcium aqueous solution, respectively, and treated with pure water as control. The effects of calcium cyclate on the growth, development and fruit quality of 'Luntaibaixing' apricot and the optimum concentration of spraying were studied in different treatment groups.【Result】 Compared different concentrations of prohexadione calcium spray treatment with the control of water spray, the fruit setting rate increased by 4.85% on average, new shoot length shortened by 1.80 cm on average, new shoot internode length shortened by 0.50 cm on average. new shoot length base width increased cm.0.10 cm on average, average blade length shortened by 0.52 cm, average blade width increased by 0.65 cm, average leaf area increased 0.85 cm², chlorophyll content increased by 4 SPAD, average leaf net photosynthetic rate increased 0.83 μmolCO₂/(m²·s), fruit individual weight increased by 1.42 g FW, fruit hardness increased by 1.11 kg/cm², fruit titratable total acid content increased by 0.69 g/kg FW on average. There was no significant difference in soluble sugar content in fruit. In 4 treatment concentrations, the effect of 125 mg/L calcium tricyclic acid spraying was the best.【Conclusion】 Spraying 125 mg/L prohexadione calcium on leaves 10 days after blossoming can effectively inhibit the growth of branches and leaves, improve the photosynthetic efficiency of leaves, and increase the weight and hardness of single fruit.

Key words: Luntaibaixing apricot; prohexadione calcium; shoot and leaf growth; photosynthetic efficiency; fruit quality