Abstract: In order to explore the effects of meteorological factors on fruit quality of Hongmeiren citrus, six quality indices of open cultivated citrus were determined for three consecutive years by sampling, and data of five main meteorological indices were collected and organized. This paper analyzed the relationship between meteorological factors in different phenological stages and fruit quality, coupled with relevance and regression analysis. The results showed that sucrose (SUC) and total acid (TA) were both significantly positive correlated (P<0.05) with precipitation amount at the germination stage. Sunshine duration at the germination stage had a significantly negative correlation (P<0.01) with SUC and a significantly negative correlation (P<0.05) with total soluble solids (TSS) and TA. Average temperature at the physiological fruit-dropping stage, as well as ≥10 ℃ active accumulated temperature in the same period, had a significantly negative correlation (P<0.05) with TA. At the picking stage, when average temperature was 18.5~19.5 ℃, ≥10 ℃ active accumulated temperature was 565.3~596.7 ℃, respectively, a higher ambient temperature would help accumulate the fruit sugar. TSS also showed a significantly positive correlation with sunshine duration at the flowering stage, while a significantly negative correlation (P<0.05) with sunshine duration at the picking stage. The average diurnal temperature range was a key factor affecting the flavor of Hongmeiren citrus, which was enhanced when the temperature difference between day and night became larger. To get better fruit quality, it was advised to do good insulation work with increasing the environmental temperature and heat moderately at the picking stage, and use the protected cultivation technology to adjust the microclimate environment at germination and picking stages.

Key words: meteorological factor, Hongmeiren citrus, quality, precipitation amount, sunshine duration