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Part 1—The Diviner 2000 display unit and probe
Calibrating Diviner 2000
Scaled Frequency (SF)
1
0.9
0.8
0.7
0.6
Equation of line:
0.5
0.4
0.3
0.2
SF = 0.2746*(volumetric water content^0.3314) + 0
R2 = 0.9985
0.1
0
0
10
20
30
40
50
Volumetric Soil Water Content (%)
Figure 6—Diviner 2000 calibration equation for combined soil textures
Working with the default calibration equation
The default calibration equation is based on combined data gathered from
sampling on sand, sandy loam and an organic potting soil. It is described in
Figure 6. It is built into the Diviner 2000 display unit and is labeled as the
calibration equation for soil type #01.
If you chose to work with the default calibration equation, the data will
show relative soil water changes in all soil types except for those on which
the equation is based. In these soil types, the data will show absolute
values.
Relative data
Most users use this form of measurement because they are interested in the
relative changes in soil water dynamics for their daily irrigation
management practices.
This concept was introduced successfully with EnviroSCAN, Sentek Pty
Ltd's continuous monitoring system. Almost all economic gains recorded
with EnviroSCAN in commercial agriculture were made using the concept
of ‘relative change’ in soil water dynamics.
Based on this experience, Sentek Pty Ltd recommends that relative changes
in volumetric soil moisture content based on the default calibration
supplied, can be used to show the most important soil water trends.
Sentek Pty Ltd
ACN 007 916 672
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