SOWACS: TDR and below zero temperatures

[Marty Grogan <ges@serv.net>]

Marty Grogan writes to the sowacs list:
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Experiments performed with dielectric sensors demonstrate significant 
changes in readings possibly due to crystalline structure of ice 
formations.  Casual readings even indicate a slope inversion near the 
frost point.

Marty Grogan

Johannes Deelstra wrote:

>"Johannes Deelstra" writes to the sowacs list:
>===8<==============
>Is there anyone who can tell me about how TDR-equipment functions when
>soil temperatures drop below zero.
>I have continuous readings with TDR-equipment in addition to soil
>temperatures. During the winter season when the soil temperature drops
>below zero, one can notce a sudden drop in moisture conten.
>TDR measures the water but can one say that the reading provided by the
>TDR-equipment when soil temperatures are below zero is the water content
>or is it influenced by the ice content. 
>
>
>regards
>
>Johannes (Hans) Deelstra
>
>Jordforsk
>Frederik A. Dahls vei 20,
>1432 ‰s
>
>tel: +47 64948100(8173)
>fax: +47 64948110
>
>johannes.deelstra@jordforsk.no
>www.jordforsk.no
>
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