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Re: [APD] pearling after water changes Vol 2

Land plants, at least in clay soils, have long periods for chems to accumulate and to take affect. Underwater plants, much less so; in aquaria probably even less time -- e.g., 50% changes every week? Inhibitors have been suggested as the reason why algae doesn't grow under certain circumstances when plants do well -- but no one, afaik, has ever suggested any particular chems or mechanisms that would work in aquaria with 50% weekly water changes. So, this might fall into the category of of the infinite number of things that can be conceived but (at least not yet) tested.
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----- Original Message ----
From: Jerry Baker <jerry at bakerweb_biz>
To: aquatic plants digest <aquatic-plants at actwin_com>
Sent: Monday, January 29, 2007 9:52:51 AM
Subject: Re: [APD] pearling after water changes Vol 2

S. Hieber wrote:
> That could work if the inhibitors where organic compounds, or more generally, the sticky types that activated carbon adsorbs. But it could control for one more of the factors that could be involved, i.e., carbon-sticky inhibitors if there are such things. No one has idientified any potential inhibitors nor their properties, have they?

Not in aquatic plants that I am aware of, but there are quite a few 
well-known and understood allelopathic chemicals in the terrestrial 
plant world. Wikipedia has some information 
(http://en.wikipedia.org/wiki/Allelopathy), as does the University of 
Florida (http://edis.ifas.ufl.edu/HS186).

Some potentially interesting papers might include:

Competition and allelopathy in aquatic plant communities
[Botanical Review [BOT. REV.]. Vol. 59, no. 3, pp. 155-210. 1993.]

Allelopathy of Aquatic Autotrophs
[Critical Reviews in Plant Sciences, Volume 22, Numbers 3-4, pp. 313 - 
339, May-August 2003]
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