Re: Aquatic Plants Digest V1 #394
Paul Krombholz says...
>When I was growing aquatic plants in algae-free culture back around
>1966-68, I noticed that I had a precipitate in flasks of nutrient solution
>plus iron EDTA that had been exposed to light, but no precipitate in
>identical flasks kept in the dark. However, enough iron stayed in solution
>to grow the plants satisfactorily.
>Currently, I am using iron DPTA, (diethylenetriaminepentaacetic acid),
>which appears to stay in solution a lot longer. CIBA-Geigy, agricultural
>chemicals division, makes it, but it is hard to find in your average
The trace element mixture that many of us are using up here beyond
the tree line contains 42% EDTA and 13% DTPA. It is available in
some gardening centers. I "believe" that this combination is almost
as stable as DTPA alone based upon the same reference given in my
Dave Whittaker ac554 at FreeNet_Carleton.CA
Gloucester, Ontario dwhitt at magmacom_com