Healthy soil and sustainable growing

["mtncats" <mtncats@myway.com>]

You're right.  Diurnal temp swing is what determines average.  We have 
nothing like Arizona's (land of my youth).  Interesting results of a quick 
search.

Our average air temps: June 73º, July 77º, Aug 75º
Phoenix air averages:  June 87º, July 93º, Aug 91º

Then you look at insolation.  We have average 80-90% rh during that period, 
making our skies hazy, smaller % of sunshine hitting the ground compared to 
Arizona.  Air temps plus sunshine determine (shallow) ground temps.

Little knowledge of veggie production in Arizona, but I'd guess it wasn't 
summer.  Cotton was king where I was raised.  Too water intensive now, with 
greatly decreased aquifers.  I understand the switch was to veggie-growing.  
That, and subdivision development.

None of which answers the question.  You go to more effort than I do or 
would.  What are your average air temps and rh?

Tom (in central Virginia)


 --- On Sun 04/01, Pego Rice < firekeeper38@yahoo.com > wrote:
Hmmm, Don't know


Theoretically the question seems to have some
observable support; People in areas as hot or hotter
grow this stuff, but those places are often with a
notably lower ground temp. Your daytime air temps
there in Virginia, or in, say, Arizona, can be as high
as ours, or higher, but your ground temps (and night
temps) average 10 to 15 degrees lower.

I do not really know whether simply lower ground temps
would be needed or both. Has there been any kind of
trial? I know that germination is temperature
sensitive, I have already reached the point at which I
need to refrigerate flats each night even to get
germination on a number of things.

Yours, Pego



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