Very little information and research are available regarding the chilling requirements for dormancy release and bud break in temperate fruit trees grown in temperate region. There is urgent need for research to develop new models for chilling requirement in the changing climate context.
That will vary from plant to plant - a good way is to check seed germination on chilling treatment - vernalisation during germination may be checked also
It depends on the species and cultivar you are looking at. For example apples generally need from1200-1500hrs below 7 C, but some low chill cultivars, such as Granny smith only need 300-500. There is increasing interest in low chill cultivars of many economically important fruit trees due to climate change.
http://download.springer.com/static/pdf/697/art%253A10.1007%252Fs00484-010-0352-y.pdf?auth66=1426709954_09099f2325686641b025c9f53d394779&ext=.pdf
Hello
I sent you a few articles about chilling requirement for dormancy release and flowering in temperate fruits, which I hope you will get good information on this topic.
Dear Ramesh P. Bhatt ,
Please have a look to this article.
Article Chilling requirement evaluation of the Abjosh cultivar (Viti...
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