North American Fruit Explorers mailing list at ibiblio

["del stubbs" <pinewoodel@hotmail.com>]

Tom, this is interesting. what is the Utah model?  what specie?       It 
seems it would take a temperature actuated computer to actually calculate 
chill hours in a season!.
And do chill units apply more to above ground than below? Or above snow than 
below?   Mn. Del


>From: Tom Olenio <tolenio@sentex.net>

>Below zero does not count as chilling hours.  The temperature has to be 
>higher
>than freezing and lower than 60F.
>
>Notice in the following model that tempertures over 60F degrees result in
>negative chill units (you lose chilling units), and none accumulate under 
>34F
>degrees.
>
>     Utah Model
>     1 hour below 34 degrees F =0.0 chill unit
>     1 hour 35-36 degrees F =0.5 chill units
>     1 hour 37-48 degrees F =1.0 chill units
>     1 hour 49-54 degrees F =0.5 chill units
>     1 hour 55-60 degrees F =0.0 chill units
>     1 hour 61-65 degrees F =-0.5 chill units
>     1 hour >65 degrees F =-1.0 chill units
>
>Hope this helps to calculate chilling hours.
>
>Regards,
>Tom
>==
>Thomas Olenio
>Ontario, Canada
>Hardiness Zone 6a
>

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