Chilling and Heat Requirement of Peach Tree Based on Hourly Temperature Data

doi:10.11924/j.issn.1000-6850.casb2021-0491

Abstract

Abstract:

To use temperature data to determine the chilling requirement and heat requirement of peach tree, the coefficient of variation and correlation analysis were adopted in the study based on the data of the beginning date of peach flowering of ‘Hujingmilu’ in Ningbo and the hourly temperature during the same period from 2006 to 2021. The results showed that the chilling requirement was 740 h based on 7.5℃ model and the heat requirement was 200℃·d with the lower limit temperature of 4.5℃ of Ningbo ‘Hujingmilu’. Using the determined heat and chilling requirement of ‘Hujingmilu’ to calculate the beginning date of peach flowering from 2006 to 2018, the R² and RMSE between the fitted and actual value were 0.4639 and 7.9 d (n=13) respectively, and the correlation coefficient (0.6811) passed the test at the significance level of 0.05. The RMSE of the independent sample test from 2019 to 2021 was 2.6 d, both the fitting and independent sample tests got good results. This study could provide a method for determining the chilling and heat requirement by using temperature data and the flowering data of deciduous fruit trees, and the results could provide technical support for ‘Hujingmilu’ cultivation and the dynamic forecast for its beginning date of flowering.

Key words: peach tree, hourly temperature, chilling requirement, heat requirement, ‘Hujingmilu’, deciduous fruit tree, flowering forecast

CLC Number:

S161

ZHU Xiaocui, ZHENG Jian, CHEN Miaojin, SHEN Yan, LI Jun, YUE Sujia, YANG Yiman. Chilling and Heat Requirement of Peach Tree Based on Hourly Temperature Data[J]. Chinese Agricultural Science Bulletin, 2022, 38(11): 84-88.

Figures/Tables 4

References 27

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