Re: [AGA Member] High magnesium levels

["Amit Brucker" <amitb@gtek.co.il>]

Thanks Roger! this link was my source:
http://fins.actwin.com/aquatic-plants/month.9611/msg00193.html

Amit
----- Original Message ----- 
From: "Roger Miller" <roger@spinn.net>
To: <aga-member@thekrib.com>
Sent: Monday, December 01, 2003 4:48 PM
Subject: Re: [AGA Member] High magnesium levels


> On Sunday 30 November 2003 13:29, thepuppypirate wrote:
> > Mg can and will displace K if present at an excessive level
>
> I've never seen documentation of a case of magnesium blocking potassium
> uptake, but I suppose in extreme cases it is possible.  Potassium, sodium
> calcium and magnesium must be balanced within some broad guidelines or one
> may block another.   Of the three nutrients (sodium not usually being a
> nutrient) potassium is the hardest to block.
>
> Hydroponics solutions are frequently formulated with potassium, magnesium
and
> calcium in the ratio of 4:1:4 (potassium:magnesium:calcium).  If magnesium
is
> going to block anything it is most likely to block calcium.  The magnesium
> concentration should be kept lower than the calcium concentration.
>
>
> Roger Miller
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