Soil moisture Impedance-method (Hydra Probe II)
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Parameter to be measured:
Soil moisture
Method:
Impedance-method
Equipment:
- Stevens: Hydra Probe II
Advantages:
- easy and fast measurement of punctual soil moisture
- manual as well as continuously logged measurements possible
Disadvantages:
- Each sensor has to be calibrated
- careful application of probe in stony soils
- Underestimating of permittivity in media with low permitivity (ε > 40, clay and organic soils)
What to watch out for:
- Good contact between probe and medium has to be prooved
Problems/Questions:
Links
Other related web sites:
- Stevens: Manual & Theory
References
Blonquist, JM; Jones, SB; Robinson, DA. 2005. Standardizing characterization of electromagnetic water content sensors: Part 2. Evaluation of seven sensing systems. VADOSE ZONE JOURNAL 4 (4): 1059-1069.
Seyfried, MS; Murdock, MD. 2004. Measurement of soil water content with a 50-MHz soil dielectric sensor. SOIL SCIENCE SOCIETY OF AMERICA JOURNAL 68 (2): 394-403.