Observation

hysteresis between the wetting and the drying curve, the

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meteorological elements

hysteresis between the wetting and the drying curve, the
unstability of the calibration in time, and other influences
such as the presence of soluble salts in the soil and
temperature coefficients.

28
Despite these restrictions, electrical resistance blocks
appear to be quite suitable for investigations, with an
emphasis on soil-water changes in time, rather than on
absolute values. For such purposes, the probes can be buried
in great numbers at various sites and depths. The electrical
output can easily be used for remote reading and recording
without further interference in the soil structure. This and
the comparatively low cost of both the probes and the
measurement equipment have contributed to the wide use of
this method. There are various water-absorbent materials

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