Appendix A
42
z
Profile Probe User Manual
3.0a
Variable Intercept
Fit a linear trendline to the data, and in the
Options tab choose to display the equation.
You may need to adjust the number format
for the equation to 3 decimal places.
The calibration coefficients can then be
read off directly. In the example shown,
a
0
= 1.537 and
a
= 8.656.
1
Fixed Intercept
Fit a linear trendline as above, but in the
Options also choose “Set intercept =”.
We suggest you use the following default
intercept values:
Organic soil
1.4
Mineral soil
1.6
Heavy clay
1.8
In this example the intercept has been set
to
a
= 1.8, and the calculated value for
a
0
1
=
7.794.
