Re: [APD] RE: Fe and K+

["Philippe Lemaire" <ph_lemaire at CompaqNet.be>]

Thanks again...

I will drop the K+ to 40 ppm...
However all of it comes from root feeding + TMG + Other trace mixes !
Hopefully the high quantity of those needed to "save" the fast growers
will be normalised once the too high K+ will be suppressed !

Regards,

Philippe


----- Original Message ----- 
From: "Thomas Barr" <tcbiii at earthlink_net>
To: <aquatic-plants at actwin_com>
Sent: Tuesday, January 06, 2004 12:47 AM
Subject: [APD] RE: Fe and K+


> 
> > From: "Philippe Lemaire" <ph_lemaire at CompaqNet.be>
> > Subject: Re: [APD] Notes on the notion of high K+ causing Fe ??
> > inhibition 
> > To: "aquatic plants digest" <aquatic-plants at actwin_com>
> >
> > As I have 90 ppm of K+ in my tank and some problems
> > with H. zosterifolia (whitish leaves or black dots or melting)...
> > could it prevent Fe absorption or as I read elsewhere too much
> > Fe (Total? = 1 ppm) is the same as too little ?
> >
> > Regards,
> >
> > Philippe
> 
> 1ppm is not going to cause any problems with inhibition.I've had it up
> around 2ppm for extended periods. Fe concentrations in aquatic soils can
> be/often is very high.
> High salinity can cause reduction is all nutrient uptake, not just K+ and
> Fe. 
>  
> 90ppm of K+ is nutty.
> Do a big water change.
> There's no need to try and see the extreme ends when you are up at this
> high of a level. 
> 40-50ppm K+ is pretty high and certainly NOT needed for any plant.
> 
> The routine I suggest indicates that you may not need any K+ supplements
> besides KNO3 except is rare cases with high fish loads, less light/few
> plants etc. 
> 
> Regards, 
> Tom Barr
>  
> 
> Regards, 
> Tom Barr
>  
> 
> 
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