Effects of Foliar Application of Zinc Fertilizer on Sugar and Acid Accumulation,Yield and Quality of Korla Fragrant Pear Fruits

Ma Hongyou; Yusufujiang Yusuyin; Li Binghao; Shi Zhuanhui; Zhang Youyin; Lu Changyu

doi:10.14083/j.issn.1001-4942.2025.02.016

Abstract：To investigate the effects of foliar application of zinc fertilizer on sugar and acid accumulation and yield and quality of Korla fragrant pear fruits,and to screen out the optimal concentration of zinc fertilizer,this experiment was carried out using 6-year-old Korla fragrant pear trees as test materials.On the basis of con-ventional fertilization,spraying 0.15％zinc sulfate(Z1),0.30％zinc sulfate(Z2)and 0.45％zinc sulfate(Z3)solutions were set at 23,38,53 and 68 days after flowering respectively with spraying water as the con-trol(Z0),and their effects on yield and quality related indicators of mature fruits were studied.The results showed that spraying zinc fertilizer could increase the number of fruits per plant,single fruit weight and yield,and also improve the fruit quality.Among them,the Z2 treatment had the best effects.The number of fruits per plant,single fruit weight and yield of Z2 treatment increased by 28.19％,5.07％and 34.79％,respectively,compared to Z0 treatment;the fruit hardness and contents of soluble solids,VC and protein increased by 18.91％,7.48％,6.74％and 20.00％,respectively,while the organic acid content significantly decreased by 9.85％.From the correlation analysis results,it could be seen that the soluble sugar content of fruits was highly significantly positively correlated with fructose content;the total acid content was highly significantly positively correlated with malic acid,oxalic acid and shikimic acid contents,and the strongest correlation was with malic acid;the soluble sugar content was highly significantly negatively correlated with the total acid content.In summary,in the production and management of 6-year-old Korla fragrant pear,appropriate foliar application of zinc fertilizer could improve the yield and quality of pear fruits.It was recommended to spray zinc fertilizer at a concentration of 0.30％.