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Re: [APD] Re: Begging limitless questions
Well, this is one of the more interesteing threads I've
seen in a long time -- and I find nearly all of the threads
An interesting turnabout on viewing general techniques:
deciding how to limit plant growth and which appearances
(nutrient deficiencies (including CO2 as one of the
possible nutirents)?, light deficiency) are acceptable.
--- Roger Miller <roger at spinn_net> wrote:
> On Tuesday 16 September 2003 21:11, Scott H. wrote:
> > Yep, same goes for lighting too, and the rest, right?
> > why must there be a deficiency?
> Some years ago in this post
> Dave Heubert offered the tidbit that under ideal
> conditions fast growing
> aquatic plants are capable of doubling their mass every
> 4-6 days. Personally
> I may have seen plants grow that fast briefly, but I've
> never seen any plant
> sustain that kind of growth. Most of our aquarium plants
> grow much more
> slowly than that and it's a good thing. Personally I
> wouldn't want to remove
> 1/2 ot 2/3 of the plant mass in my aquarium every week
> just to maintain the
> status quo.
> Perhaps in some cases the growth rate is limited by the
> genetic makeup of the
> plant. I doubt that accounts for very many limitations
> because if it did
> then we would never see variations in the growth rate.
> The growth rate would
> be a predetermined constant set by the plant's genetic
> I theorize that almost any healthy-looking plant we see
> in our aquariums has
> its growth limited by light. In some cases perhaps the
> CO2 supply is the
> limiting factor. I maintain that theory plainly and
> simply because every
> nutrient shortage has a disease-like deficiency symptom.
> I don't think a
> gardener can limit plant growth with nutrients without
> eventually seeing
> those symptoms.
> I think this also goes to why George B. protests so about
> the recent trend of
> recommending high light in aquariums. High light levels
> do little more than
> lift the limit on growth rates, force greater demands on
> CO2 and nutrient
> levels and increase the likelihood that nutrient-related
> problems will set
> in. Why go out of your way to invite problems when there
> is so little to be
> The question about how a light-limited plant looks may
> have a simple answer;
> it looks healthy and well-nourished. There are obviously
> lows at which this
> is no longer true -- where the light is too low for
> plants to grow. That
> point varies from species to species. A healthy-looking
> aquarium always
> contains an assemblage of plants that can grow well
> within whatever light
> limits the aquarium imposes.
> Much of this might also be said about plants with growth
> limited by CO2.
> Light and CO2 are so closely linked that their effects
> can be difficult to
> Roger Miller
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