Re: Tree sap question

In article <fq78ql$elr$1@xxxxxxxxxxxxxxxxxxxx>, nmm1@xxxxxxxxxxxxx
says...

In article <8t8es397lkfjhchsjdanl6igt4qeg5jmqf@xxxxxxx>,
Chris Hogg <me@xxxxxxxxxxx> writes:
|>
|> PS: Just found this on wikipedia, for what it's worth.
|> http://en.wikipedia.org/wiki/Cohesion-tension_theory

That's what the books had, and they waved their metaphorical hands
equally vigorously while spouting comparable platitudes. Doubtless
someone has put some mathematics around that, though it may be
pretty dubious, but I have not seen it.


Regards,
Nick Maclaren.

Having read that I still can not see how it explains how a tree can raise
its sap before it has any leaves if the main force was evaporation there
must be some pretty powerful back up forces at work too.

--
Charlie Pridham, Gardening in Cornwall
www.roselandhouse.co.uk
Holders of national collections of Clematis viticella cultivars and
Lapageria rosea
.

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