Re: Scientific information


Hold on thar! Aquatic botanists have published reams of information on 
the physiology and ecology of aquatic plants. Lots of it is applicable to 
the culture of aquatic plants in the aquarium. Among the more 
interesting, well proven data: Rooted aquatic plants grow best on a 
mineral soil such as a silt loam with low organic matter. Rooted aquatic 
plants require no N, P, S, or micronutrients in the water column when grown 
on a fertile substrate. Rooted aquatic plants grow best when the 
substrate is anaerobic ... in fact some roots will not produce root hairs 
UNLESS the substrate is anaerobic. In most cases, it appears that 
inorganic carbon limits growth of submerged aquatic plants... not because 
it is too low in concentration or because the uptake mechanisms are 
inefficient in aquatic plants (in fact both factors are comparable to 
terrestrial plants), but because the diffusivity of CO2 in water is about
100,000 times slower in water than in air.
 Aquatic plantsundergo cyclical growth, even under constant conditions. 
This means that even under optimal conditions your plants will slow down 
and maybe even die back every once in a while. etc.etc.etc.

dr dave.