AVR-Chat

Show me soil with pure, distilled water in it.

Look, I am just telling you what will work.  There is no way for a simple
test unit with a probe to tell the difference between water or high metallic
content in the soil.  I can tell you that dry soil, regardless of 
mineral makeup
will have a MUCH higher resistance than wet soil.

Ralph Hilton wrote:
>
> On Thu, 18 Oct 2007 16:16:18 -0500 you (Thomas Keller 
> <tjkeller1@alltel.net <mailto:tjkeller1%40alltel.net>>)
> wrote:
>
> >Basicly, the resistance of soil is based on moisture content, because it
> >is the moisture
> >that provides the conductivity from particle to particle, not the
> >mineral or other
> >dry content of the soil.
> >
>
> I'd suggest testing it in practice. It doesn't work that way. Pure 
> distilled
> water has a very low conductivity. The dissolved salts in the water 
> bring about
> the conductivity. That's the principle on which a TDS meter is based. 
> (total
> dissolved solids).
>
> >avrFreak
> >
> >Ralph Hilton wrote:
> >>
> >> On Thu, 18 Oct 2007 12:27:59 -0500 you (Thomas Keller
> >> <tjkeller1@alltel.net <mailto:tjkeller1%40alltel.net> 
> <mailto:tjkeller1%40alltel.net>>)
> >> wrote:
> >>
> >> I was wondering how a simple resistance measurement could
> >> differentiate between
> >> a moist soil with low nutrient content and a drier soil containing a
> >> lot of
> >> soluble nutrients.
> >>
>
> --
> Ralph Hilton
> http://www.ralphhilton.org <http://www.ralphhilton.org>
> C-Meter: http://www.cmeter.org <http://www.cmeter.org>
> FZAOINT http://www.fzaoint.net <http://www.fzaoint.net>
>
>