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Dear James:
I would like to caution that many of the "diurnal" or "diel" changes in
soil water content and potential in soil profiles, especially at depth,
are many times an electronic/thermal phenomenon created within the
datalogger or sensor itself. Nearly all electronic components have
thermal sensitivities. Manufacturers attempt to compensate for
these, and generally do good, but not perfect jobs.
These effects need to be sorted out by conducting background
tests using independent, and perferrably nonelectronic,
measurements or by using "dummy" sensors that do not change
reading with water content.
Rick Allen
Univ. Idaho
> Dear subscribers,
>
> I am a student in the UK and am concentrating my study on the diurnal =
> changes of soil moisture at depth, deeper than 60cm's in the soil. =
> Could you point me in the right direction for references which deal with =
> diurnal 'recharge' in soil moisture, or 'overnight resorption'.
>
> Many thanks for any help
>
> James A. Dalton
>