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Re: Aquatic Plants Digest V3 #660

At 03:48 AM 11/22/98 -0500, Dave wrote:
>> All I can say is this statement is in line with the known chemical and 
>> biological facts concerning EDTA as I've outlined above. If anyone has any 
>> evidence otherwise, I would be more than happy to take a look at it.
>Well, theres about 50 years of hydroponics and aquatic plant research 
>that clearly shows that Fe:EDTA delivers adequate amounts of Fe for 
>sustained maximal growth.

It would be really nice if you could give a solid cite for this, preferably
a recent review paper that could educate us all....

>> I'm sorry, I don't follow here. If as you're saying plants only uptake
>> and the chelated iron is Fe+3, then how is the plant going to uptake the 
>> Fe+3?
>Current thinking suggests that plants attach the Fe:EDTA complex onto 
>the membrane and remove the Fe ion. How this occurs is not fully 
>understood but it is certainly an effective uptake system.

Actually there is quite a bit of info on this subject (which has been
studied a lot at TAMU (Texas A&M))


HTH.   Dave G

Dave Gomberg, San Francisco            mailto:gomberg at wcf_com