Abstract:

Objective The Chilling Requirement (CR) of different varieties of sweet cherries were studied, and the differences in CR of the same varieties of sweet cherries in different regions were compared. Methods From 2021 to 2022, the Utah model, the 7.2°C model and the 0-7.2°C model were applied to the six varieties of sweet cherries cultivated in Huludao City, Liaoning Province, namely Jiahong, Hongdeng, Mingzhu, American Red, Sand Honey Bean and Meizao, as well as Jiangxi The CR of four varieties of sweet cherries cultivated in the Fuzhou region, namely Sand Honey Bean, Mingzhu, Jiahong and Meizao, were estimated. Results For the sweet cherry varieties tested in the Huludao area, the estimated CR of the Utah model ranged from 469 to 564.5 C.U. The estimated CR of the 0-7.2 °C model ranged from 334 to 442 h. The estimated CR range is between 710 and 1218 h; for the sweet cherry varieties tested in Fuzhou, the estimated CR range of the Utah model is between 261.5 and 525 C.U. The estimated CR of the 0-7.2 °C model The estimated CR ranged from 98 to 301 h, and the estimated CR of the 7.2 °C model ranged from 105 to 328 h. For the sweet cherry varieties tested in the Huludao area, the estimated CR of the Utah model ranged from 469 to 564.5 C.U. The estimated CR of the 0-7.2 °C model ranged from 334 to 442 h. The estimated CR range is between 710 and 1218 h; for the sweet cherry varieties tested in Fuzhou, the estimated CR range of the Utah model is between 261.5 and 525 C.U. The estimated CR of the 0-7.2 °C model The estimated CR ranged from 98 to 301 h, and the estimated cooling capacity of the 7.2 °C model ranged from 105 to 328 h. Conclusion There is a big difference in the CR of the same variety of sweet cherries in the two regions. The Utah model estimated the difference is the smallest, and the preliminary judgment is more suitable for the comparative study of the CR of sweet cherries in different regions.

Key words: sweet cherry, chilling requirement, different regions