Study on the chilling requirement of flower buds and heat requirement of flowering of"Jin"series yellow peaches in Shanghai
For two consecutive years(November 2021 to April 2022 and November 2022 to April 2023),the 0-7.2 ℃ model and effective accumulated temperature model were used to estimate the chilling requirement(CR)of flower buds and heat requirement(HR)of flowering in 9"Jin"series yellow peach varieties in Shanghai.The relationships between different years,varieties,CR and HR,as well as between CR and HR and full bloom period and fruit growth period were analyzed.The results showed that among the 9"Jin"series yellow peach varieties,the average CR of flower buds for 2 years was between 551 and 867 hours,and the variety with the lowest CR of flower buds was'Jinchun',which was 551 hours.The flower buds of'Jinxiang','Jinguan',and'Jinxiu'had a moderate CR,ranging from 704 to 767 hours;The flower buds of'Jinhui','Jinfeng''Jinyuan','Jinhua'and'Jinshuo'had a relatively high CR,ranging from 823 to 867 hours.The average HR of flowering for 2 years was between 251-285 d·℃,and the varieties with lower HR of flowering were'Jinchun','Jinxiang',and'Jinguan',which were between 251-258 d·℃.'Jinfeng','Jinyuan','Jinxiu',and'Jinhua'had a moderate HR of flowering,ranging from 270 to 275 d·℃;'Jinhui'and'Jinshuo'had a relatively high HR of flowering,ranging from 282 to 285 d·℃.There was a highly significant positive correlation between CR of flower buds and HR of flowering.There was a correlation between CR and HR and the full bloom period.Varieties with low CR and HR bloomed earlier,while varieties with high CR and HR bloomed later.There was no correlation between CR and HR and the fruit ripening period.
PeachChilling requirementHeat requirementFlower budsFull bloom period
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