measured by a detector inserted into a second parallel access
tube. This method does not measure soil-moisture directly but
uses the effect that different soil-water contents produce
different soil densities.
As many technical problems have not yet been solved
satisfactorely, the application of this method has not been
successful in widespread field applications.
2.8.216 The heat conductivity method
Another indirect method to estimate the soil-moisture content
involves the relationship between soil-heat conductivity and
water content. To establish this relationship, detailed soil
specific mesurements of the heat conductivity and
calibrations against the soil-water content have to be
carried out. Although, once this relationship is established,
simple soil-temperature measurements could be used to derive
the soil-water content, little research has so far been done
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