[APD] Re: Aquatic-Plants Digest, Vol 9, Issue 4

["roger" <roger at spinn_net>]

On Tue, 4 May 2004 11:44:08 -0400, Daniel wrote

> Total hardness 3.6 degrees.

What does your water utility give for the magnesium concentration?  From the
calcium concentration you gave earlier and the total hardness above I would
guess that it's about 3 mg/l.
 
> So the K is probably lower than Ca. The Boron
> is high (Ca-deficiency is sometimes confused with
> Boron-deficiency). The Mg is low.

You have to watch out with boron.  Literature says there is a fairly fine line
between boron that is sufficient for some plants and boron that is toxic to
other plants.  "High" boron could be a bad thing.
 
> This was interesting:
> http://fins.actwin.com/aquatic-plants/month.9804/msg00552.html

My problems in that case were a calcium deficiency aggrevated by high sodium
in my tap water and damage from rasping fish.  My eventual solution was to
treat the plant by pushing bits of calcium tablets into the substrate around
the plant whenever deformities showed up.  I don't think that calcium
deficiency is indicated in your case; a calcium deficiency would effect the
growing tip of the plant, which appears normal.

I think Paul Sears responded to the idea of using blackboard chalk and said
that these days blackboard chalk is not made from calcium carbonate.  That's
why I used calcium tablets.


Roger Miller
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