Abstract :【Objective】Pear is a kind of fruit tree with many flowers in inflorescence. Each inflorescence generally contains more than 5 flowers, and the fruit setting rate is high. If the measures of flower thinning and fruit thinning are not taken in production, the load per plant is too high, which often causes large differences in fruit size, poor coloring and poor quality, resulting in reduced economic benefits. For the excellent varieties, although their own quality is excellent, but in the large-scale commercial production, if there is no scientific technical guidance for flower and fruit thinning, often due to the high load per plant and the number of inflorescence fruit, resulting in high quality fruit rate is not high, pear fruit market competitiveness is poor, pear orchard economic benefit is low, and then seriously affect the pear farmers planting enthusiasm. In order to ensure the sustainable and stable development of the industry, the research and application of fruit thinning technology plays an important role in achieving stable yield, high yield, high quality and high efficiency of the pear industry. Due to the variety of pear cultivation, the number of inflorescence flowers and the natural fruit setting rate of different varieties are not the same. It is urgent to determine the appropriate inflorescence fruit retention amount of Hanhongli through research.【Method】In this experiment, single fruit, double fruit and three fruit in inflorescence were treated at 7 days after flowering, and no fruit thinning was used as control. The internal quality and external quality of fruits under each fruit thinning treatment were determined, and the effects of each treatment on the external quality and internal quality of fruits were analyzed.【Result】According to the results of fruit growth and quality testnumber of fruit in different inflorescences had a certain effect on the yield and single fruit weight of the corresponding inflorescence. With the decrease of the number of fruit in inflorescence, the single fruit weight of 'Hanhongli' fruit showed an upward trend, while the yield showed a downward trend. It shows that fruit thinning will significantly reduce the yield of the corresponding inflorescence, but it will significantly increase the single fruit weight and produce larger fruit. Compared with the control, the inflorescence fruits of G1 and G2 treatments showed large fruit (vertical and horizontal diameter increased), increased single fruit weight, and good appearance quality. The fruit retention of G3 treatment was more, and the fruit quality was relatively poor, the fruit was small, and the flavor was poor. However, the excessive number of inflorescence fruits increased the yield but decreased the single fruit weight, which affected the fruit quality. The contents of reducing sugar, soluble sugar, soluble solids and vitamin C in ‘Hanhongli’ were higher than those in the control, among which G1 and G2 treatments were higher, and the titratable acid content did not show a decrease. The fruit hardness of each treatment was significantly lower than that of the same group, while that of G3 treatment was higher than that of the control. Hardness is an important quality index of fruit. Relatively, the hardness of pear fruit of the same variety of crisp flesh type is better than that of low flesh and crisp taste, indicating that reducing the number of fruit left in inflorescence is more beneficial to the growth and quality development of fruit in corresponding inflorescence.【Conclusion】Appropriate load can improve fruit quality, maintain high excellent fruit rate and a certain yield.‘Hanhongli’ is a new cold-resistant pear variety with the blood of Pyrus ussuriensis varieties. It is a large fruit type with a single fruit weight of more than 200 g. Fruit thinning is beneficial to improve the comprehensive quality of the corresponding inflorescence retained fruit of Hanhongli, especially the single fruit weight, soluble solids and hardness. The overall performance is that the less the inflorescence retained fruit, the better the quality improvement effect. Based on the comprehensive analysis of this study, it is suggested that the fruit thinning of 'Hanhongli' should be carried out 7 days after flowering, and 1-2 young fruits with good development can be selected for retention, and the best is to retain single fruit in inflorescence. The fruit development of pear varieties is affected by many factors. The reasonable fruit thinning scheme for the production of high-quality pear varieties can be used as a reference. The specific fruit thinning scheme should be determined according to the actual situation of pear orchard.
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