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Re: Slow turnover of water in substrate

>Date: Tue, 4 Nov 1997 13:51:12 +0800 (SGT)
>From: Casey Huang <yhplsing at singnet_com.sg>
>Could someone please offer an explanation concerning
>oxygen requirements for plants root.
>According to TOA there should be slow / small movement
>of water in the substrate through substrate heating so
>as not to have too much oxygen in the substrate inorder
>to get reduction type of processes for the nutrients in
>substrate so that the nutrients can be easily absorbed
>by the plants. 
>According to books about Hydroponics the nutrients are
>mixed by aeration with the air hose in the culture trough
>to have more oxygen in the nutrients to support the
>metabolic processes associated with root formation and
>subsequent growth.
>The same for Aeroponics which is self explanatory from
>Aero in the word Aeroponics.

In hydroponics and aeroponics, they use chelated trace elements to ensure
that the plants get nutrients in consumable form.  In an aquarium, if you
have an anaerobic substrate, the reduction of nutrients to a consumable
form occurs naturally.

David W. Webb           Texas Instruments
(972) 575-3443 (voice)  http://www.dallas.net/~dwebb
(214) 581-2380 (pager)  2145812380 at alphapage_airtouch.com