Message: 7
Date: Thu, 14 Oct 2004 08:37:22 -0700 (PDT)
From: Thomas Barr <tcbiii at yahoo_com>
Subject: [APD] Re: why not fertilize a new tank right away??
To: aquatic-plants at actwin_com
If plants have the same growth rate without roots(when the water column is
non limiting), how can they benefit a new tank with roots? While roots are
produced regardless of where the nutrients are, a simple method I did for
about 10 years with plants can help. RFUG's(Reverse flow UG's, see
archives) basically remove the nutrients from the substrate and place it
in the water column.
So this type of substrate has no nutrient content(the sand is 2-3mm
silica, nothing added less some mulm mixed in that did not get blown out).
While 90% of the plants thrives, there were some differences in a variety
of species. These did better with Flourite and other no flow systems, and
the heating cables did the same as the RFUG overall.
So back to the question: why not fertilize from the very __start__ of a
planted tank?
John suggested roots are good/better and I have stated that it does not
make a difference in the start up.
Whether or not you have fertilizer in the water column is an issue. I
think you will get more, not *less root growth*, if you add fertilizer to
both regions(water column and a little in the gravel-mulm, leonardite,
peat, bacteria, soil, etc) or just the water column, I've got many years
growing tanks where the nutrients are in different regions and also both
places.
So I would have to say fertilizing the water column is a good idea from
day one of a new tank. If root formation is really that critical in a CO2
enriched tank that has a non limiting water column, why doesn't this
causes issues when we replant?
Do we see algae due to less roots/more established roots?
What are we waiting for when we start up a new tank?
Generally bacteria. But if the plants are given what they need to grow
well, then what role do the bacteria play? Why do we not see cycling in a
planted tank? The plants remove all the NH4. Mulm and peat take care of
the reduction and bacteria in a new tank.
Plants take care of the NH4, so..........what is left?
Will roots grow at faster rate/more biomass in ANY significant way without
water column fert's in the first month vs adding fert's?
I doubt it.
The best thing I can figure is the roots add O2 and metabolites for
certain species of plant friendly bacteria.
But we need less O2 _initially_ since the bacterial layers have not yet
formed(hence the addition of peat and a little bit with the mulm-or soil
etc, basically any organic matter), less O2 will help reduce trace metals,
you do not want too much or too little reduction for optimal conditions.
So I think we can rule out O2(in older tanks with more mulm and detrital
matter, this would play a more significant role) in a new set up(unless
you added a lot of organic matter, eg soil).
So it gets back to the bacteria.
Well, how important are they and how significant do you think bacteria
might be if the roots grew a little faster the first 4 weeks? Would this
be significant?
I doubt it.
Regards,
Tom Barr
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End of Aquatic-Plants Digest, Vol 14, Issue 20
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