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03-08-2003, 02:12 AM

in article , simy1 at
wrote on 8/2/03 5:25 PM:

I do not know, but plants produce active chemicals at the rhizosphere
(the root surface) that break down soil compounds into something
plants can assimilate. I suppose they could poison themselves
eventually, lacking the buffer capacity of soil.

Hydroponic formulations are usually well buffered. In particular, they have
a lot of phosphate and ammonium nitrogen.

Bill