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Useful notes
If there will be rain before the soils reaches -15 bars, the
Tensiometer cup will suck up the soil water. However, the soil water
includes dissolved gas which will degas as soon as a dry soil again
will increase the tension. This will result in a poor response, the
signal curve will get flatter and readings will only slowly adapt to the
actual soil water tension. Depending on the size of the developed
bubble readings will get less close to the maximum (fig. 7.2, after day
20).
Interpretation Messwerte unter 10 bar in tieferen
10000
1000
100
10
1
0
Abb. 7.2 Tensiometer readings with tensions to -10 bars
Other problems that can be recognized by checking the data:
Soil water tension normally change only slowly. Therefore, a signal
curve with lot of jumps could be an indicator for example for loose
contacts, moisture in defective cables or plugs, poor power supply or
data logger malfunction.
With T8 and T4e Tensiometers, unsteady signals might also be
caused by solar radiation on the refilling tubes. This would require
the use of thermal insulation - see chapter 3.1.4.
Interpretation of readings below 10 bars
Bodenschichten
in a greater depth
Soil water tension
Bodenwasserspannung
Tensiometer reading
Tensiometermesswert
5
10
15
Time
45/58
20
25
Zeit
30
35
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