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Steve Evett writes to the sowacs list: ===8<============== Dear Johannes, John Baker and Egbert Spaans published on this topic: Spaans, E.J.A., and J.M. Baker Examining the use of time domain reflectometry for measuring liquid water content in frozen soil. Water resources research.Dec 1995. v. 31 (12) p. 2917-2925. Spaans, E.J.A., and J.M. Baker The soil freezing characteristic: its measurement and similarity to the soil moisture characteristic. Soil Science Society of America journal. Jan/Feb 1996. v. 60 (1) p. 13-19. Spaans, E.J.A. Field and laboratory investigations of soil freezing characteristics. Agricultural research to protect water quality : proceedings of the conference February 21-24, 1993 Minneapolis, Minnesota, USA. p. 512-514. You can find more in Agricola: http://www.nal.usda.gov/ag98/ Steve Evett At 09:17 PM 3/18/2003 +1200, you 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 > ___________________ Steve Evett, Soil Scientist, Lead Scientist - Crop Water Use and Irrigation Research Team Soil and Water Management Research Unit USDA-ARS, P.O. Drawer 10 (2300 Experiment Station Rd.), Bushland, TX 79012 USA 806-356-5775, FAX: 806-356-5750 srevett@cprl.ars.usda.gov, http://www.cprl.ars.usda.gov/programs/ ===8<============== NOTE: To get off this list, send an email to list@sowacs.com with the subject line: unsubscribe_sowacs For full instructions see this page: <http://www.sowacs.com/subscribe/index.html>