Effects of Different Chemical Fruit Thinning Agents on Thinning and Fruit Quality of Meiba and Pink Lady Apple

NIE Lin; ZHAO Hongliang; CAO Yijing; SUN Ang; LU Hang; LIU Limin

doi:10.15933/j.cnki.1004-3268.2025.06.014

Abstract：To study the thinning effect and fruit quality of different chemical fruit thinning agents on different apple varieties,five years old Meiba and Pink Lady apple varieties were used as test materials,seven treatments were set up,including 6-BA 0.1 g/L(T1),6-BA 0.2 g/L(T2),6-BA 0.3 g/L(T3),carbaryl 1.5 g/L(T4),carbaryl 2.0 g/L(T5),carbaryl 2.5 g/L(T6),spraying water as a control.The results showed that,compared with control(CK),the treatment of 6-BA and carbaryl significantly reduced fruit setting rate of flower,fruit setting rate of inflorescence,double fruit setting ratio,increased empty bourse rate,single fruit setting rate and fruit qualities of apple varieties Meiba and Pink Lady.Compared with CK,T3 significantly increased single fruit setting rate by 46.28%and 35.94%,significantly reduced fruit setting rate of flower by 34.63%and 41.50%,significantly increased single fruit weight by 5.22%and 5.16%,significantly increased soluble solids content by 6.75%and 2.16%,and significantly increased soluble sugar content by 9.06%and 5.95%of apple varieties Meiba and Pink Lady,but had little effects on fruit hardness.Compared with CK,T6 significantly increased single fruit setting rate by 26.56%and 19.95%,significantly reduced fruit setting rate of flower by 22.48%and 27.19%,significantly increased single fruit weight by 3.70%and 3.18%,significantly increased soluble solids content by 5.40%and 2.82%,significantly increased soluble sugar content by 7.40%and 7.58%,and significantly decreased fruit hardness by 2.88%and 2.52%of apple varieties Meiba and Pink Lady.By comprehensive comparison,the spraying of 6-BA 0.3 g/L and carbaryl 2.5 g/L were better for thinning fruits,which significantly reduced fruit setting rate of flower,fruit setting rate of inflorescence,and double fruit setting ratio,and significantly increased empty bourse rate,single fruit setting rate and fruit quality of Meiba and Pink Lady.The spraying of 6-BA had little effect on the hardness of Meiba and Pink Lady,while the spraying of carbaryl could reduce the hardness.