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Re: nutrients



> From: Thomas Barr <tcbiii at earthlink_net>
> Subject: Re:nutrients
> 
> > Does a lower Ph still help with carbon uptake when using Excel?
> 
> I would suppose so.

	O.K., I'll bite.  Why would a lower pH help with carbon uptake
when _not_ using Excel?

	The CO2 concentration (and the H2CO3 concentration) do not
_depend_ on the pH.  Don't forget - the pH is _set_ by the CO2 concentration
and the KH.  A low pH may be achieved by raising the CO2 concentration, but
you can't get a good CO2 concentration by adding another acid to lower
the pH.


-- 

Paul Sears
psears_at_nrn1_dot_nrcan.gc.ca, 613-996-4171, facsimile / télécopieur 613-996-9400
Natural Resources Canada, 1, Haanel Drive, Nepean, Ontario K1A 1M1
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