SOWACS: TDR and below zero temperatures

[Megan Cullen <Megan@Soilmoisture.com>]

Megan Cullen writes to the sowacs list:
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Dear Mr. Deelstra:
Our president, Whitney Skaling, sends you this little graph and explanation.

[Bruce  comments: since most mail systems will not accept attachments,
I have uploaded the one page pdf file here:
http://www.sowacs/com/feature/soilmoisture/iceTDR.pdf  ]

Sincerely,
Megan Cullen
Sales Manager
Soilmoisture Equipment Corp.

-----Original Message-----
From: Johannes Deelstra [mailto:johannes.deelstra@jordforsk.no]
Sent: Tuesday, March 18, 2003 1:17 AM
To: brooz@pobox.com
Subject: SOWACS: TDR and below zero temperatures

"Johannes Deelstra" writes to the sowacs list:
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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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