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RE: Aquatic Plants Digest V3 #820
- To: <Aquatic-Plants at actwin_com>
- Subject: RE: Aquatic Plants Digest V3 #820
- From: "Frank I. Reiter" <FIR at istar_ca>
- Date: Tue, 2 Feb 1999 17:58:52 -0500
- Importance: Normal
- In-Reply-To: <199902022048.PAA05747 at acme_actwin.com>
> From: "Michael Bartnik" <rev_grover at hotmail_com>
> Subject: Questions about PMDD
> I have a few questions about PMDD that I hope someone could answer. Let
> me start out by stating that I won't argue about whether PMDD method
> works. It clearly does. I am having trouble determining proper dosing.
> If I understand correctly the best method is to measure the iron content
> of the water and dose enough PMDD to keep iron levels at .1 ppm. I'm
> using terralit as a substrate additive and have never had insufficient
> iron level in my tank <.1 ppm (also no signs of iron deficiency in my
> plants). In addition recent posts have been pointing out that the test
> kits used are not measuring chelated iron. The forms of iron
> registering on the tests are not the ones being used by plants.
> This leads me to think that I should be using another method to
> determine dose size.
People keep saying that, but I know that my LaMotte kit shows iron when I
add my PMDD-clone trace element mix, and then it shows the level dropping as
the plants use it up, and when it shows zero I better add some more or the
plants start to suffer.
I'm not a chemist and do not understand why chelated iron should or should
not register or why it in fact does for me, I only know that here, it works.
The very act of seeking sets something in motion to meet us;
something in the universe, or in the unconscious responds as if
to an invitation. - Jean Shinoda Bolen