Re: [AGA Member] CO2 concentration in Hard water

[Paula Hofmann <paula.hofmann@gte.net>]

Thank you Jim for a great summery of nutrition "symptoms."

> Most people forget that aquatic plants behave exactly the same as
> terrestrials
> in their response to nutirents.  That is, there is a continuum from
> nutrient deficiency to nutrient toxicity.  Unfortunately, the problem lies
> in the fact
> that many plants exhibit similar symptoms to various nutrient levels.
>
> For simplicity sake, most plants exhibit the following symptoms;
>
> Nutrient deficiency - stunted growth, poor coloration, and reduced
> flower/fruit
> production.
> Nutrient sufficiency - optimal growth, coloration, and flower/fruit
> production.
> Luxury consumption - excessive weak growth, excessive coloration (many
> plants
> appearing green almost to the point of having black leaves), excessive poor
> quality flower/fruit production.
> Nutrient toxicity - stunted growth often resulting in a crippled
> appearance, poor coloration,and reduced flower/fruit production. (Many of
> the same symptoms
> as nutrient deficiency)
>
> Since the macro and micro nutrients interact in a chemical balance,
> excessive
> levels of one micro nutrient can also cause a defficiency in others due to
> it's
> increased ability to cross the cell membrane in the ionic state and replace
> other
> more weakly charged nutrients.  Therefore causing similar misleading
> symptoms.
> Aluminium is a prime example in replacing other micro nutrients, resulting
> in
> toxicity.
>
> Unfortunately, we in the terrestrial horticultural industry have an unfair
> advantage in many, many years of research in plant physiology, plant
> nutrition,
> and the like, as well as the common practice of taking tissue samples to
> determine nutrient levels in a production crop like Christmas poinsettias.
> Through the use of tissue samples, we can mix up the correct nutrient
> solutions
> to push maximum growth in minimal time and push the envelope without
> actually
> crossing over into luxury consumption which would be an unnecessary expense
> in
> wasted fertilizer.
>
> Sadly, aquatic plants haven't reached this state of economic importance to
> justify the research and equipment expenses.
>
> Cheers.
> --Jim
>
>
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