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Re: Re: GA3 in seed germination

  • Subject: Re: Re: GA3 in seed germination
  • From: Ted.Held@hstna.com
  • Date: Tue, 29 May 2001 08:23:31 -0500 (CDT)

The GA will precipitate out if you put in more than is soluble. The idea is
to target your one gram per liter, dissolve that in alcohol, and dilute
with water to make a liter. If GA is soluble at 1 gram per liter, it will
not precipitate at this level, alcohol or no alcohol. Merck reports GA as
"slightly soluble". This is not specific. But if literature suggests using
it at 1 gram per liter, it probably means that GA is soluble to this
extent. Using the alcohol route just speeds the dissolution process and
avoids the possible problem of some of your GA ending up on the container
sides, insoluble and not noticed, wasted. Potassium hydroxide (or sodium
hydroxide, or any number of other bases) will help things along. The
problem with these is achieving a nice, neutral pH. Hardly impossible, but
a pain for the basement or backyard gardener.

I am a chemist, though not a specialist in GA. But what I write is pretty
elementary chemistry.


aroid-l@mobot.org on 05/26/2001 11:10:35 AM

Please respond to aroid-l@mobot.org

To:   Multiple recipients of list AROID-L <aroid-l@mobot.org>
Subject:  Re: Re: GA3 in seed germination

My only hesitation with dissolving GA in ethanol and then mixing in water
would be the GA precipitating out of solution. Since your using so little
you may not see it, in which case you might as well just use water.
Needless to say, if you use alcohol of any kind, use very little.

Any chemists out there?

Regarding Ph, you're always safe around 7 give or take.
We have very basic water here in Tucson and all my plants do well...
.except that one protea.


>From: mburack@mindspring.com
>Reply-To: aroid-l@mobot.org
>To: Multiple recipients of list AROID-L <aroid-l@mobot.org>
>Subject: Re: Re: GA3 in seed germination
>Date: Fri, 25 May 2001 10:02:47 -0500 (CDT)
>Dear Nyles,
>Many thanks for the info....but as far as pH goes... what number should I
>be looking for? "7" or is there an acceptable deviation higher or lower?
>Thanks for the info
>aroid-l@mobot.org wrote:
> >
>I always make a potassium salt of GA.
>It's been shown to be more active than other salts, or even pure GA.
>GA is not freely soluble in water, so the easiest way to do this whole
>procedure in your living room is to measure out the amount of distilled
>water into any glass container under a good light.
>Add the amount of GA that you want.
>You'll see the powder floating on top of the water.
>(A good conversion from parts per million (ppm)to something you can deal
>with is to change it to milligrams per liter...not exact but VERY close)
>Slowly add potassium hydroxide (KOH) to the mixture while stirring gently.
>Use very small amounts at a time.
>At some point the powder will suddenly disappear and go into solution.
>The Ph should be OK if you haven't overused the potassium hydroxide.
>If your worried, use litmus paper or a pool Ph test kit.
>Hope that this helps!
> >From: Iza & Carol Goroff
> >Reply-To: aroid-l@mobot.org
> >To: Multiple recipients of list AROID-L
> >Subject: GA3 in seed germination
> >Date: Thu, 24 May 2001 17:25:04 -0500 (CDT)
> >
> >A typical dose for seeds is from 250 to 1000 parts/million. 1 gram
> >last much, much longer. The use of GA3 was thoroughly investigated by
> >Norman Deno in his Seed Germination and Practice (and in two subsequent
> >supplements), where he investigated various
> >approaches for germinating over 5,000 species of plants. GA3 does not
> >easily dissolve in water. I cannot find my copy of Seed Germination and
> >Practice to give the the procedure for its dilution, although in the
> >supplements he has no problem germinating the aroids listed
> >without the use of GA3, instead using different temperature/time
> >
> >My suggestion is to NOT put all of your eggs (seeds) in one basket.
> >GA3 works wonders with some species, others are killed.
> >
> >Iza Goroff
> >Whitewater Wisconsin
> >
> >Perhaps someone
> >
> >Marc Burack wrote:
> >
> > > Based on the info you sent, I think that GA is really more in line
> >I am looking for....
> > >
> > > I purchased some yesterday although it seemed more expensive than I
> >thought... I paid $25 for 1 gram.  I really dont know if that is
> >or not, but obviously since I am going to use small amounts per
> >application, 1 gram should be good for anywhere from 5-8 uses.
> >
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