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Dear Wenceslau, You should also look at: JACOBSEN, O. H.; SCHJONNING, P. A laboratory calibration of time domain reflectometry for soil water measurement including effects of bulk density and texture. Journal of Hydrology, v. 151, p. 147-157, 1993. I think it will be nice for you. In my soil conditions I have some problems concerning to the bulk density and texture effects. The soil is a latossol with 60% of clay and 18% of iron oxide. The water absorsion of the particle is very large difficulting the equipment measurement. Your problem can be similar to this situation. Hope I could help you. Any more questions send me a e-mail. Best Regards, Claudinei. <cfsouza@agr.unicamp.br> owner-sowacs@aqua.ccwr.ac.za wrote: > NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za > with the body of the message containing the line: > unsubscribe sowacs > > Dear participant > I am interested about the interference of organic matter present in the > soil in the determination of the moisture by TDR. > Is there some physically-basead model of calibration with division of the > soil matrix into organic matter and mineral matter? > I am interested in values of the apparent dieletric number of organic > matter. > Could someone please give me a couple of published references ? > I thanks in advance . > > Regards > Wenceslau Teixeira > > ____________________________________________ > Wenceslau Geraldes Teixeira > UniversitŠt Bayreuth > Bodenkunde - Abt. Bodenphysik > D - 95440 - Bayreuth > Fax: 0049 921 552246 > Tel: 0049 921 552162 > Email: wenceslau.teixeira@uni-bayreuth.de