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RE: [AGA Member] compact inter-node growth please...
On my tanks i use a mixture of 10000k pcf and zoomed's
florasun NOFL which I won at an auction. I have no
conclusive 'proof' that my plants are more compact due
to the 10000k bulbs, but I do get compact growth.
However, research has shown that plants in early
stages of development will respond to blue light
through growth inhibition. This causes the plant to
grow toward that light source.
What do I mean? Scientists took sprouting plants and
shined blue light on one side of the plant with no
other light source. This caused the plant to bend
itself towards that light. How did it do this? If you
were to bend a pipe to one side, the pipe must become
more compact on one side than the other side or else
the pipe remains straight. So plants, to bend their
growth, must cause an inhibition of growth on one side
while the other side continues to grow. This causes
them to bend
------------
----+++++ |
Blue Light source--> + |
+ |
| |
+ = growth inhibited (compacted)
- = normal growth
Scientists discovered that blue light has the largest
(only?) effect on plants in this manner. Researchers
then compared the growth of plants isolated to only
blue light to that of sunlight and found that since
blue light "inhibits" cell growth that all of the
plants under blue light were more compact than their
sunlight counterparts. Sorry if some of this sounds
hazy, I only caught glimpses of information out of my
Plant Physiology course. I can always dig up the
papers though :). THe scientists were doing research
on photoreceptors in plants.
All in all, will the 10000k bulbs make more compact
growth? Maybe. Many times the light coming out from
the 10000k bulb is not blue but bright white. I'd like
to know why some of these bulbs are not blue but
white? Could there be a strong red peak along with the
blue peak to make white light? I have not had
experience with these bulbs promoting algae growth. I
personally like the look of the white lights. It makes
the system seem cleaner. The reds in my fish and
plants really stand out against the green. I found
when I was using the 5000k and 6500k bulbs that things
were a little "washed out," but this is all personal
preference.
I believe that tom barr said amano uses 8800K bulbs,
and, in fact, tom barr has far more experience than I
do in the field of science and aquatic plants. Amano
also uses a lot of light to create intense lighting
habitats for his bunch plants. I know that light
intensity plays a role in plant growth, but do not
remember reading much literature on it. Maybe tom barr
or others could enlighten us. sorry for the
long-winded email. I hoped to explain the blue light
"compact" growth subject. Anyway, I hope others do
chime in. Adios,
David Lim
--- Livay Aviel-R51374 <Aviel.Livay@motorola.com>
wrote:
>
> Back to 'technical' Ladies/Gentlemen???
>
> I thought Daylight is a cheap blue and Warm White is
> a cheap red.
> I use the OSRAM Lumilux and according to Ivo Busko
> article on AB
> http://www.aquabotanic.com/lightcompare.htm the
> daylight Dlx has a preety good 'blue PUR' (11.9) and
> the warm while dlx has a good 'red PUR' (11.6)
> comparing to bulbs on the same Watts category.
>
> Now if I have to move on to 10K - fine 10K - but I
> thought these Fluorescents are more for reefs and
> could trigger algae. Also could one such 10K
> "inhibibt" the growth or should I replace ~50% of my
> FLs?
>
> Thanks,
>
> Aviel.
>
> -----Original Message-----
> From: owner-aga-member@thekrib.com
> [mailto:owner-aga-member@thekrib.com] On Behalf Of
> david
> Sent: Thursday, March 25, 2004 6:26 PM
> To: aga-member@thekrib.com
> Subject: Re: [AGA Member] compact inter-node growth
> please...
>
> Blue light inhibits plant growth whereas red and far
> red light is used for photosynthesis. Blue light
> will
> make your plants more compact but a good mixture of
> the two is more beneficial. Do daylight bulbs have a
> lot of blue? I was always under the impression that
> these bulbs have a yellow tint and produce more red.
> Aren't these bulbs at 5000-6700K? You might try
> mixing
> the daylights or coolwhites with some 10000k bulbs
> from the aquarium store. These bulbs have lots of
> blue.
>
> David
>
> --- Amit Brucker <amitb@gtek.co.il> wrote:
> > Yes stem plants love bright light!!! I would even
> go
> > for 3-4 wpg, You can
> > ventilate your light tubes.
> > Blue spectrum might encourage algae growth.
> > Trimming can help - but I would increase the
> light
> > levels including RED
> > spectrum.
> >
> > Amit
> > ----- Original Message -----
> > From: "Livay Aviel-R51374"
> > <Aviel.Livay@motorola.com>
> > To: <aga-member@thekrib.com>
> > Sent: Thursday, March 25, 2004 3:11 PM
> > Subject: [AGA Member] compact inter-node growth
> > please...
> >
> >
> > > Hi,
> > >
> > > My stem plants seem to grow with bigger than
> > desired inter-node gaps.
> > While this is acceptable for cabomba or Macrandra
> I
> > do not enjoy the look of
> > Ceratophyllum demersum and Myriophyllum
> tuberculatum
> > to say the least.
> > >
> > > Do I need to go beyond 2.5 wpg for my 200 gallon
> > tank? - I hate to do that
> > because of heat.
> > >
> > > I know blue spectrum should help things get
> bushy
> > - I currently mix 50%
> > daylight (for the blue) with 50% warm white (for
> the
> > red) - should I get rid
> > of my warm whites? Is it OK to go for straight
> > daylight all
> > across-the-board?
> > >
> > > Is there any thing I could change in my
> > fertilization? CO2? Trimming?...
> > >
> > > Thanks,
> > >
> > > Aviel.
> > > ------------------
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>
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