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Re:name that deficiency

Paul wrote:

I think that DPTA is a much more light resistant chelator, although itmight 
not be resistant to UV light.  CIBA-GEIGY  sells iron DPTA.  It mightbe worth 
your while to get some of that so that you can try out your theorythat you 
are raising other micronutrients to toxic levels in the effort toget 
measurable iron.  If you can't find any source of iron DPTA, I can sendyou 
some.I think that the likely reason that plants didn't do so well for 
somepeople who switched to tri-phosphor lamps is that the brighter light 
causedmore rapid growth and greater demands on nutrients and something ran 
out,causing deficiency and allowing algae to get started, etc.  You have 
towork harder to keep everything supplied when the light is more intense.Iron 
can be hard to supply in adequate amounts, and low-level irondeficiency does 
not look like the classic iron deficiency where the newgrowth is very pale.  
Low level iron deficiency can mimic nitrogendeficiency or potassium 
deficiency or both.  The reason may be that theplants are actually unable to 
get enough nitrogen or potassium because ofthe iron deficiency.  I have seen 
examples of both apparent N and Kdeficiencies that didn't make any sense 
because I knew how much nitrate andhow much potassium was in the water.  
Pushing iron DPTA cleared up theproblem.

Thanks for the offer Paul. I just got flourish Iron in the mail- what do you 
think about this source of Iron? Maybe Dr. Morin can tell us if light affects 
the iron. If I dose flourish iron right now to say .5ppm I would bet any 
amount that if I test in 24 hours it will be 0. If I repeatadly did this 
would it stabalize? I guess it would if it was being used by plants/algae and 
not light correct? 

Jeff Vamos
cessnabum1 at aol_com