Effect of Climate on Fruit Quality of Citrus unshiu‘Miyagawa Wase’

During 2017 and 2019, 3 Citrus unshiu‘Miyagawa Wase’orchards were selected in Linhai, Huangyan, Sanmen, Wenling and Jiaojiang of Taizhou, Zhejiang province for harvesting fruit from 5 trees in each orchard. Determinations were conducted on single fruit weight, edible rate, soluble solids, total acid content, ascorbic acid, and their relationship with fruit quality and five climate factors at different phenological stages was analyzed by correlation and regression analysis. The results showed that at the physiological fruit dropping stage, with average temperature of 24.1-25.8 ℃, ≥10 ℃ active accumulated temperature of 740.8-792.0 ℃, higher temperature would decrease the fruit quality. Total acid content had evident positive relation with annual precipitation (P<0.05), while evident negative relation with annual sunshine duration (P<0.05). Sunshine duration at the physiological fruit dropping stage had significantly positive correlation (P<0.01) with ascorbic acid content. The experiment found that the flavor of C. unshiu‘Miyagawa Wase’fruit would be better with higher average daily temperature range.