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Today's Topics:
1. RE: internode distance (Thomas Barr)
2. Re: RE: internode distance (Liz Wilhite)
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Message: 1
Date: Mon, 27 Jun 2005 23:01:01 -0700
From: "Thomas Barr" <tcbiii at earthlink_net>
Subject: [APD] RE: internode distance
To: aquatic-plants at actwin_com
Crowding (This occurs in forest as well with trees and other plants, and
in
aquatic systems), intensity, nutrient status(CO2, macro nutrients), color
temps/wavelenth are not relevant at our depths, there is little selective
nm extinction at less than 24 inches~ 60cm in clear fresh water.
Some may want to argue about it, but I do not see any differences, never
have.
Plants adapt to the color differences anyway and it gets back to an issue
of intensity rather than wavelength.
Trimming/pruning routines and branching/canopy also plays a role.
You can a high light tank but a dark corner may have a plant that is
reaching for more light.
So add placement to that list.
Prune more often, add more PO4/trace/CO2 is a general notion I suggest.
Regards,
Tom Barr
3rd annual Plant Fest July 8-14th 2005!
subscribe at BarrReport_com Get connected
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[Original Message]
From: <aquatic-plants-request at actwin_com>
To: <aquatic-plants at actwin_com>
Date: 6/27/2005 9:02:27 AM
Subject: Aquatic-Plants Digest, Vol 22, Issue 34
Send Aquatic-Plants mailing list submissions to
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or, via email, send a message with subject or body 'help' to
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When replying, please edit your Subject line so it is more specific
than "Re: Contents of Aquatic-Plants digest..."
Today's Topics:
1. Internode Distance (Mariano Fern?ndez Bonfante)
----------------------------------------------------------------------
Message: 1
Date: Mon, 27 Jun 2005 12:07:35 +0000
From: Mariano Fern?ndez Bonfante <mariano_bonfante at hotmail_com>
Subject: [APD] Internode Distance
To: aquatic-plants at actwin_com
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?.
Looking forward,
Mariano F. Bonfante
Buenos Aires
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------------------------------
Message: 2
Date: Mon, 27 Jun 2005 23:19:22 -0700
From: Liz Wilhite <satirica at gmail_com>
Subject: Re: [APD] RE: internode distance
To: tcbiii at earthlink_net, aquatic plants digest
<aquatic-plants at actwin_com>
> 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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