Appendix C—Creating a customized calibration equation
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Appendix C—Creating a customized calibration
equation
Ø
To calibrate using the gravimetric/volumetric technique
1.
Install six access tubes, two in wet soil, two in moist soil and two in dry
soil, using the appropriate installation method.
Note:
The wet site may need artificial ponding with water. The dry site
may need the establishment of a fast growing deep-rooted crop to dry
out the soil profile. The distinctions must be clear. Refer to installation
diagram below.
2.
At each depth on the probe take three Diviner 2000 raw count readings
e.g. 10cm, 20 cm, 30cm.
3.
Calculate the scaled frequency for each sample.
SF = (F
A
- F
S
) (F
A
- F
W
)
–1
Where:
•
F
A
is the frequency reading in the access tube while suspended in
air
•
F
S
is the reading frequency in the access tube in soil at a particular
depth level
•
F
W
is the reading frequency in the access tube in the water bath.
Summary of Contents for Diviner 2000
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