Re: 70 to 25 in 48 hours, moving air, water
- To: perennials@mallorn.com
- Subject: Re: 70 to 25 in 48 hours, moving air, water
- From: R* B* <s*@ici.net>
- Date: Thu, 12 Mar 1998 14:08:44 -0500 (EST)
Well.. sort of. The principle here is that a lot of energy is gained or
lost when water changes phases between liquid and solid (any younger brains
remember just how many joules or Kcals it is?) You need to add a bunch of
energy (or is that a Kbunch) to turn 32F ice into 32F water. Similarly, you
have to remove a bunch of energy from 32Fwater to make 32F ice.
Herein lies the frost protection, since energy "donated" by water to make
ice is energy not donated by plant tissues. Of course, cold enough air
demands more heat than the water has to give, and you end up with frozen
water coating frozen plants...
~ 21F last night, probably <15F tonight. Nights like this tell me which
stock can't overwinter in containers. Real science.
Russ
At 13:21 03/11/98 -0500, you wrote:
>Hi Robert,........
> Spraying them with water has two parts. The first works when the temp will
>hover just above/around freezing. The relatively warmer water is supposed
>to help generate a small amount of heat as it evaporates, and it helps
>prevent frost formation on the wet leaves.
> This is what I 'remember' being told to me. I would love to hear a clearer
>answer from some one who knows more.
>
> We made out fine last night with the wind, I hope everyone else in frost
>border states was just as lucky!
>
>
>>------------------------------
>>
>>Date: Tue, 10 Mar 1998 16:54:22 -0600
>>From: Robert Sperl <rsperl@ameritech.net>
>>Subject: Re: 70 to 25 in 48 hours
>>
>>I was listening to the radio and heard that commercial growers were
>>spraying trees down several times during the night and keeping fans on
>>them???
>>---------------------------------------------------------------------
>>
>
>Matt Trahan <matttrahan@ecsu.campus.mci.net>
>USDA zone 8, Sunset zone 31, AHS heat zone 7, northeastern N.C.
>
>SUPPORT http://www.cauce.org/ (with no money) HELP STOP SPAM
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