Effect of fruit thinning and pruning on growth and fruit quality of Citrus
[Objective]This study aimed to improve the cultivation and management of Citrus reticulata in Yunnan.It also provided a reference for exploring thinning and pruning methods that were simplified and efficient in enhancing fruit quality.[Method]The medium-to late-maturing varieties of C.reticulata planted in 2017 were used as test material.Fruit thinning and pruning treatments were carried out during the fruit expansion period according to the experimental setup.Treatment 1(CK):no fruit thinning,more than four fruits,without new shoots;Treatment 2:fruit thinning,four or less fruits,with new shoots;Treatment 3:all fruits were thinned,and autumn shoots were released.All other aspects were managed consistently except for different fruit thinning and pruning treatments.The mineral element content and endogenous hormone content of C.reticulata leaves,stems and fruits were determined.As well as chlorophyll,soluble sugar and soluble protein contents of leaves,longitudinal and transverse diameters of fruits,single fruit mass,soluble solids content,titratable acid content and other indexes were determined.[Result]Soluble sugar and soluble protein contents in the leaves increased under fruit thinning and pruning treatments.At the same time,the growth of transverse and longitudinal diameter of the fruit was accelerated.However,the harvested fruits showed no difference in transverse and longitudinal diameter and fruit mass per fruit and soluble solids content from the control,except for a significant decrease in titratable acid content.In addition,GA3,JA,and SA hormone contents in leaves and fruits increased compared to the control.The lowest chlorophyll content and the highest accumulation of endogenous hormone content in the leaves were observed at full fruit thinning.The N,Ca,Fe,Mn and Zn contents showed an overall trend of leaf＞stem＞fruit.The P and K element contents of leaves and stems,as well as Fe and Mn elements in fruits were significantly higher in the fruit thinning and pruning treatments than in the control.[Conclusion]Fruit thinning and pruning significantly promoted the growth of C.reticulata fruit and increased the accumulation of mineral elements and endogenous hormones in the plant.
NETL
NSTL
万方数据
维普
