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Re: Regarding "frost warning" help

Square Foot Gardening List - http://www.flinet.com/~gallus/sqft.html

 My hubby says it has to do with the rate of melting and the heat produced. A thick coating of ice forms into a liquid slower causing less heat. Whereas a thin layer of frost evaporates quickly causing more heat. A burn results. Does this make sense?
--

On Wed, 16 Jun 1999 21:26:08   Autumn Donaldson wrote:
>Square Foot Gardening List - http://www.flinet.com/~gallus/sqft.html
>
>I might be ignorant, but something from my Grade 9 science class is nagging
>at the back of my mind about how when a substance changes phases (is that
>the right word? ) from gas to liquid or liquid to solid, and vice versa,
>energy is given off.  So, my guess is that by thawing the ice by spraying it
>with water, energy is given off, thereby warming the plants and protecting
>them from damage.  Farmers do it all the time in Florida with their citrus
>crops.
>
>For those of you who actually know what I'm talking about, feel free to
>correct me.
>
>Autumn
>-----Original Message-----
>From: Towey, Brian <cbt4489@glaxowellcome.com>
>To: sqft@listbot.com <sqft@listbot.com>
>Date: Wednesday, June 16, 1999 4:06 PM
>Subject: RE: Regarding "frost warning" help
>
>
>>Square Foot Gardening List - http://www.flinet.com/~gallus/sqft.html
>>
>>> Regarding a suggestion that was given to Lisa:
>>> Getting up early (b4 the sun rises in my area) to water spray my garden
>in
>>
>>> order to prevent possible frost warning damage is something I will
>>> definitely try NOW & in the fall. It sounds like the easiest possible way
>>>for me (& clever!), but I'm inquisitive----how does this process prevent
>>the
>>>damage?
>>
>>As far as I can tell, this spraying-water business is based on the mistaken
>>idea that ice cannot get colder than 32 degrees F.  Ice, of course, can get
>>as cold as its surroundings, all the way down to absolute zero in places
>>like Ottawa <grin>.
>>
>>If somebody has a good reason why frozen fog is more damaging than frozen
>>tap water at the same temperature, I'd love to hear it.  Of course, if the
>>water is warm and it warms up the plants so that they don't freeze at all,
>>that would be different.  But, I have known people to encase their poor
>>plants in solid ice cubes trying to prevent freeze damage.  As far as I
>>know, it doesn't work.
>>
>>-BT
>>
>>
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