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https://www.groworganic.com/blogs/articles/chill-hours-what-are-they-how-do-i-count-them-and-why-do-my-fruit-trees-car#:~:text=The%20traditional%20definition%20of%20a%20chill%20hour%20is,if%20the%20temperature%20is%20between%2045%C2%B0F%20and%2034%C2%B0F.
https://www.groworganic.com/blogs/articles/chill-hours-what-are-they-how-do-i-count-them-and-why-do-my-fruit-trees-car
The traditional definition of a chill hour is any hour under 45°F. But wait, there's more. But wait, there's more. Academics have competing theories on what "chill" means.
https://www.cultivatetoplate.com/what-are-chilling-hours-and-why-are-they-important/
Chill hours are the total number of hours below 45 degrees F that a plant is exposed to during their dormant period to produce properly developed fruit. Some deciduous fruit trees (fruit trees that loose their leaves seasonally) must go through a certain minimum number of chill hours to release their dormancy, go into bloom, and set their fruit.
https://www.lecooke.com/ask-the-grower/what-are-chill-hours.html
Many deciduous plants and trees require a certain amount of winter/dormant chilling to properly set fruit or even flower. In its simplest definition, chilling hours are the number of more or less continuous hours under 45 degrees F. during the dormant period.
https://www.plantmegreen.com/pages/plant-hardiness-zones-and-chill-hours
Chill Hours (sometimes called Chill Units) are an approximation of how many hours of weather between 32 degrees and 45 degrees (F) a plant requires to properly go dormant so it can wake up and blossom and/or set fruit. Notice, it is not the …
https://etweather.tamu.edu/chill/
Chilling hours are calculated as a tool for fruit producers to gauge whether their crop has been exposed to cold temperatures for a long enough time period. This table shows chilling hours as recorded at the Overton Center and should provide you with an estimate of chilling hours if you live in northeast Texas.
https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=16468
The necessary signal strength varies between species, but is officially referred to as “chill hours”, or vernalization, when the temperature stays between 32°-45°F. The hormone responsible for dormancy breaks down in this range, allowing buds to develop into flowers or foliage when the weather warms up in late winter.
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