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Slow turnover of water in substrate

Hi Dave & Roger,

Many thanks to both of you for the information.

So, it looks like using chelated trace elements is good
for people using heating cables (for slow water turnover -
low in Oxygen) and a MUST for those using UGF/RUGF 
(for not so slow water turnover - high in Oxygen).

Casey Huang

yhplsing at singnet_com.sg

>>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.

>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

>Low-oxygen conditions in a substrate promotes the availability of some
>nutrients.  Iron seems to be most commonly cited.  Iron and some other
>essential metals form insoluble compounds in their oxidized states, but
>form more soluble (and so more readily available) compounds when oxygen is
>absent.  Low oxygen supplies also suppress bacterial nitrification, so
>ammonium in the substrate remains readily available to plants.

>With the plant roots under aerated conditions the gardener has to supply
>the plants with all nutrients in a state that the plants can readily use -
>so a careful and intensive fertilizing routine is necessary. 

>Roger Miller