Abstract: Based on observation data of the orange fruit inflation and meteorology during 2003-2004, the influence of the meteorological factors, such as precipitation, temperature and sunlight on the fruit inflation velocity of orange without irrigation was studied. The results showed that the precipitation was positively related to the inflation of fruit diameter significantly, while there was an obvious linearity relation between temperature and the inflation of fruit diameter. When the average daily temperature was lower than 30℃, there existed a notably positive correlation between temperature and the inflation of fruit diameter, while there was negative correlation when the temperature was higher than 30℃. Moreover, the influence of sunlight had two aspects. There existed an evident positive correlation between sunlight and the inflation of fruit diameter in the condition of the suitable temperature and precipitation, while there existed an evident negative correlation with the disaster of the high temperature and drought.

Key words: Meteorological condition, Meteorological condition, Orange, Fruit inflation