Abstract: In order to enrich the fruit market and to prolong the supply period, two varieties of raspberries were introduced and grown in greenhouse of Beichen District and Jixian of Tianjin. The average weight of single fruit, horizontal diameter and soluble solids of fruits were analyzed, and the storage characteristics were also studied. The results show that the weight of single fruit, horizontal diameter and soluble solids content of fruits increased gradually along with the fruit growth of the red raspberry. From the white period to the scarlet period of fruit development, the weight of single fruit increased to 25.91 g from 14.41 g, the latter was 1.8 times of the former. The horizontal diameter of fruit changed from 14.20 mm to 17.25 mm, and the soluble solids of fruits changed from 6% to 9%, with 3% increase. At the same maturity (all was in the scarlet period), the single fruit weight of red raspberry was about 1.7 times to the yellow raspberry. The horizontal diameter of red raspberry was 1.13 times to the yellow raspberry. The maximum soluble solids content of red raspberry was 9%, also slightly above 8% of the yellow raspberry. At 4 ℃ storage, the rotting rate of raspberry increased along with the fruit storage extended. To the 3rd day, the fruit rot rate rapidly increased to above 50%, and to the 7th day, the fruit rot rate came to 100%. The storage time of red raspberry fruits was the longest in pink period harvest, but the soluble solids of fruits in pink period was lower than those in fresh red period. Therefore, the best harvest time should be from pink period to fresh red period of fruits.

Key words: harvest time, weight of single fruit, horizontal diameter of fruit, soluble solids of fruit, fruit rot rate