[NAFEX] California's screwed tree crops

Richard Harrison rharrison922 at yahoo.com
Fri Jul 24 13:29:32 EDT 2009

      I don't want to "fight" about GW, either, but wanted to point out that the USDA zone chart(which indicates the minimum temperature of Winters) shown by the speaker at the fruit meeting in LA recently indicated the zones had actually expanded Southward, rather than Northward. So this is cooling, not warming. However, no one predict the future with any degree of accuracy.
      Yes, I agree, some areas may be on a warming trend and others in a cooling trend, temporarily. Personally, I didn't care for the negative sound of the topic title--and after looking at the link discovered flaws which affected the controversial conclusion(title of post).
I consider it very questionable if not misinformation---even if it was written by Ph D's.

--- On Fri, 7/24/09, Ginda Fisher <list at ginda.us> wrote:

From: Ginda Fisher <list at ginda.us>
Subject: Re: [NAFEX] California's screwed tree crops
To: "North American Fruit Explorers" <nafex at lists.ibiblio.org>, "nafex at lists.ibiblio.org" <nafex at lists.ibiblio.org>
Date: Friday, July 24, 2009, 8:49 AM

Sure, I don't want to fight about global warming today.  I do want to elaborate a little on the prior post, from Richard Harrison, asserting an increase in chill hours in some warmer states.

That's not inconsistent with global warming.  My understanding is that chill hours are not hours when it's really cold, but are only hours when it's sorta chilly (near or above freezing, up to 40 or 50F), when the trees are metabolically active but 'feel cold'.   I gather that in very cold places the native  trees don't need a lot of chill hours, since they have to come out of dormancy quickly and do their thing.  It's places with long bumpy springs and late frosts where the local trees have adapted by needing a lot of chill hours.

So if global warming is linked in some areas with a longer spring, you could easily get both higher average temps and more or similar chill hours.

Also, the US is a large country with lots of climate zones, some quite chilly.  Surely agricultural plantings can move north if we get even quite a lot of global warming.  Concurrant disruption of rainfall patterns is a more serious agricultural threat, but I'm sure the US will continue to be able to grow food _somewhere_, however cliate change plays out.

-- Ginda

Alan Haigh wrote:

Please members, can we refrain from another fruitless debate on global warming?

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