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Soil Resistivity
ρ
E
The soil resistivity is the resistance measured between two opposing surfaces
of a cube of homogenous soil material with a lateral length of 1 meter. The unit
is Ωm (see picture)
A = 1 m
2
p =
E
A
L
.
R
(
m
)
L=1 m
edw054.eps
The soil resistivity significantly depends on the specific kind of material (farm-
ing soil, dry sand, moist sand, concrete, gravel etc.), but also depends on sea-
sonal changes. Dry soil has a higher resistivity than moist soil and frozen
ground has a higher resistivity than dry, warm sand (see picture).
The two examples below show the change of resistivity during the course of
one year.