> Certainly, there are levels of V, particularly with respect
> to other trace elements, that could be excessive or at least
> be suboptimal for plant health. I find it hard to believe
> that "root cells can't tell them apart" (i.e. V and P). I
> think it would be important to consider this problem in the
> overall context of the mineral content and availability of
> the particular soil in question and the other factors
> affecting P.
I was curious so I searched for info on vanadium toxicity. I didn't find
anything in the literature suggesting that this is an important problem, but
I did find out about the mechanism of toxicity. It does mimic phosphate,
inhibiting plasmamembrane ATPase, and so inhibits active transport of PO4
and everything else. Vanadium (V) also oxidizes ascorbate producing free
radicals and associated membrane damage. If you want the 8 abstracts I
found, let me know.
Dale
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