Thank you all for your comments. I will try to
investigate the options
mentioned.
Sincerely,
Mariano
From: Liz Wilhite <satirica at gmail_com>
Reply-To: Liz Wilhite <satirica at gmail_com>,
aquatic plants digest
<aquatic-plants at actwin_com>
To: tcbiii at earthlink_net, aquatic plants digest
<aquatic-plants at actwin_com>
Subject: Re: [APD] RE: internode distance
Date: Mon, 27 Jun 2005 23:19:22 -0700
List:
Which are the key factors that determine the
internode distance in
stem
plants?. Would it be the total light amount?,
would it be the red to
blue
relation?, what about water chemistry?.
Some time back we were asked about this from a
list member who had very
high light levels. As he knew, and as I assume you
know, extended
internodal
distances are often found in terrestrial plants
that receive insufficient
light. After that post I had an unexpected
opportunity to observe changes
in
internodal distances in my own aquarium. I had
noted earlier that with
light
levels approaching 5 wpg that internodal distances
were lengthened --
something I wouldn't have predicted from my
gardening experiences. What I
recently observed is that internodal distances are
lengthened when nitrate
levels approach zero and shorten when nitrate
levels are then increased to
the range of 10 and 20 ppm. I did not test PO4 and
K levels when this
occurred, and they could easily have been low along
with NO3 levels. (I had
injured my back and not added ferts for a period of
time.) I am not saying
that low NO3 levels cause extended internodal
distances -- this is not
science but a report of observations. It could have
been something
completely different that happened at the same time
which caused the
changes
I observed.
Liz
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