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Re: Q about rooting hormone

Good Morning all,

Enough of the talc carrier remains attached to the wounded sites of the
cutting if it is dipped immediately or nearly so after being wounded.  If I
am doing batches of cuttings I will often dip them into clean water to
rewet the ends, shake off the excess and then dip into a small separate
container of the talc.  NEVER insert anything into the original container
except a clean spoon to remove some of the powder to a separate dish and
put only enough that can be used that day or the next.  This is to avoid
contamination, caking in the original container as well to minimize the
deterioration of the compounds due to heat and oxidation.  I keep all my
chemicals in a separate small refrigerator.  Do not keep the cans or jars
in a hot garage or expose the powders or liquids to direct sunlight.  While
these compounds are reasonably stable, they do deteriorate.

Also, be aware that some liquid formulations contain various types of
alcohol as solvents.  For some species this poses a problem with
phytotoxicity.  In reality there is no universally superior root promoting
growth regulator (RPGR) formulation nor application methodology.  While
talc based IBA is the standard used it would seem, there are some plants
that respond better to NAA or mixtures of the two or to other related
compounds.  This is what all the experimentation done by propagators is all
about...figuring out which works best.

btw.....it is incorrect to refer to IBA and NAA as hormones.  They are
synthetic growth regulators, just like 2,4-D and 2,4,5-T which have been
used as RPGR in micropropagation on occasion..  IAA (indole acetic acid) is
the naturally occurring compound in a plant and is properly referred to as
a hormone.  Picky point I know but just as we strive to be clean about
plant nomenclature, so we should be with other terminology.  I slip
occasionally but attribute that to brain-fade and advancing years  ;-)

Best Regards,
Scott
..........................................................
Scott Vergara		
Burley, Washington  USA
USDA Zone 8 Ave Min Temp 10-20 deg F. Record low 0/hi 104 
svergara@pacific.telebyte.com,  HORTULANUS@aol.com
..........................................................

----------
> From: Diana L. Politika <diana@olympus.net>
> To: seeds-list@eskimo.com
> Subject: Re: Q about rooting hormone
> Date: Sunday, July 13, 1997 5:57 AM
> 
> My suspicions, too.  I read in a professional growers book that the
> liquid rooting hormone translocates across the cells much faster than
> the talc based products.  I now use the liquid with great success.
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