AVR-Chat

On Thu, 18 Oct 2007 16:16:18 -0500  you (Thomas Keller <tjkeller1@alltel.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>>)
>> 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
C-Meter: http://www.cmeter.org
FZAOINT http://www.fzaoint.net