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RE: nutrient question

I went to see my chemistry teacher today, he explained that as magnesuim is
so reactive it won't form a stable borate but will preferentially oxidise
the boric acid into water, magnesium oxide and a boron compound but not the
one i want. 
Oh well, so much for bright ideas...

>Bzzzzzt!   Boron is only needed in much smaller trace amounts than
>magnesium.  Just add a pinch of boric acid or borax to the PMDD mix
>and use epsom salts for the Mg.  The borate buffer will be totally
>overwhelmed by all the other ions present in the mix.
>Best regards,

Thanks Bob.