SM150 User Manual 1
41
Calculations
Substituting in the SM150 equation
√
provides two dielectric values,
w
and
m
,
at two known water contents,
w
and
m
For the wet
soil
Substituting Vw = 0.349 gives
√
for
( )
For the moist
soil
Substituting Vm = 0.180 gives
√
f
or
( )
Calculate
a
1
Then
√
√
a
1
= 9.00
Calculate
a
0
and
√
(
)
a
0
= 1.58
Result
a
1
= 9.00
a
0
= 1.58
In this example this soil is now calibrated.
You can now use these two numbers in place of the standard
mineral or organic calibration factors to convert SM150 readings
into volumetric water content
θ
using:
1
0
a
a
See also page
Underlying principle
on page 35
