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J. Jpn. Soc. Soil Phys.
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No. +*3, p. +/,0 ,**2῍®¯°*ῌ®±²³**ῌ´µ ¶***
Calibration of Temperature Dependence of a Dielectric Probe
Tadaomi SAITO*, Haruyuki FUJIMAKI** and Hiroshi YASUDA**** Arid Land Research Center, Tottori University & Research Fellow of JSPS (PD),+-3* Hamasaka, Tottori, Tottori, 02*ῌ***+, Japan** Graduate School of Life and Environmental Sciences, University of Tsukuba,+ῌ+ῌ+ Tennodai, Tsukuba, Ibaraki -*/ῌ2/1,, Japan*** Arid Land Research Center, Tottori University,+-3* Hamasaka, Tottori, Tottori, 02*ῌ***+, Japan
Abstract
An empirical calibration method for temperature dependence of a commercially available
capacitance probe (ECH,O probe : Decagon Devices) was presented in this paper.

A laboratory

experiment was conducted to obtain probe outputs at di#erent water contents (q) and temperatures (T) using soil from Shaanxi Province, located in the Loess Plateau, China.

The probe output

showed strong positive response to T. A calibration equation describing the probe output as afunction of q and T was developed through an empirical curve ﬁtting approach. The q values
were estimated by solving the calibration equation numerically. The root mean square errors
between actual and estimated q were *.*+0 m- m-.

We also discussed the theoretical backgroundof the temperature dependence of the probe using the results from the experiment.
The calibration equation was applied to ﬁeld observation data in the Loess plateau. The
equation signiﬁcantly reduced the daily and seasonal ﬂuctuations of the probe outputs to T. A
linear calibration equation provided by the manufacturer, which neglects temperature dependence, caused incorrect interpretation of water movements, suggesting the importance for temperature calibration in arid environments.
Key words : dielectric probe, temperature dependence, calibration, water content, Loess plateau

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Campbell, C.S. (,**,) : ECH,O Dielectric Probes vs Time

Christensen,

N.B.

(,**/) : Irrigation

management

using soil moisture monitors. Western Nutrient

21 8cv9T;

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water content in two forest soils of the Paciﬁc
Northwest. Can. J. For. Res., -/ : +201῎+210.
Decagon Devices, Inc. (,**0) : ECH,O Soil Moisture
Sensor Operator’s Manual For Models EC-,*, EC+*, and EC-/ Version ,.,, Decagon Devices Inc.,
Pullman, WA.
Fares, A. and V. Polyakov (,**0) : Advances in cropwater management using capacitive water sensors.
Adv. Agron., 3* : .-῎11.

¨'ῌ©FªῌHiE ῌ«¬ῌ­® ¯
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tric and electrical conductivity measurement

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Jones, S.B. and D. Or (,**,) : Surface area, geometr-

using time domain reﬂectometry. Vadose Zone J.
, : ...ῌ.1/.

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].^._`ab1cCdeEfg h ./ iJK

ical and conﬁgurational e#ects on permittivity#LMN#$5fgjNfgON ,-ῌ,2.

of porous media. Journal of Non-Crystalline Solids,

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Jones, S.B. and D. Or (,**-) : Modeled e#ects on permittivity measurements of water content in highsurface area porous media. Physica B, --2 : ,2.ῌ,3*.
Luedeling, E., M. Nagieb, F. Wichern, M. Brandt, M.

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Schwank, M. and T.R. Green (,**1) : Simulated e#ects
of soil temperature and salinity on capacitance

Deurer and A. Buerkert (,**/) Drainage, salt

sensor measurements. Sensors, 1 : /.2ῌ/11.

leaching and physico-chemical properties of ir-

Seyfried, M.S. and L.E. Grant (,**1) : Temperaturerigated man-made terrace soils in a mountaine#ects on soil dielectric properties measured at

oasis of northern Oman. Geoderma, +,/ : ,1-ῌ,2/.

/* MHz. Vadose Zone J. 0 : 1/3ῌ10/.

McMichael, B. and R. J. Lascano (,**-) : Laboratory
evaluation of a commercial dielectric soil water
sensor. Vadose Zone J., , : 0/*ῌ0/..

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ADR/01 U MN£ .* : /*3ῌ/+3.
Or, D. and J.M. Wraith (+333) Temperature e#ects on-,ῌ--.
Topp, G.C., J.L. Davis and A.P. Annan (+32*) : Electro-

soil bulk dielectric permittivity measured bymagnetic determination of soil water content :time domain reﬂectometry : a physical model.

measurements in coaxial transmission lines. Water

Water Resour. Res., -/ : -1+ῌ-2-.
Pepin, S., N. J. Livingston and W.R. Hook (+33/) :Resour. Res., +0 : /1.ῌ/2,.
Verstricht, J., B. Neerdael, P. Meynendonckx and G.

Temperature dependent measurement errors in

Volckaert (+33.) : Clay moisture measurements

time domain reﬂectometry determinations ofin radioactive waste disposal research. Proceed-

soil water. Soil Sci. Soc. Am. J., /3 : -2ῌ.-.

ings of the symposium on time domain reﬂecto-

Petersen, L.W., O.H. Jacobsen., F., Plauborg., M. An-

metry in environmental, infrastructure, anddersen and D.E. Rolston (+33/) : The e#ects ofmining applications, Evanston, Illinois, Sept 1ῌ3,

temperature on the determination of soil water

U.S. Bureau of Mines, special publication SP +3ῌ

content by time-domain reﬂectometry, paper
presented at Soil Sci. Soc. Am. Annual Meeting,
St. Louis, Mo., Oct.,3 to Nov. -.

3., NTIS PB3/ῌ+*/123, --1ῌ-.2.
Weast, R.C. (Ed.) (+320) : Handbook of Chemistry andPhysics. CRC Press,Boca Raton, FL.

Regalado, C.M. (,**0) : A geometrical model of bound

Wraith, J.M. and D. Or (+333) : Temperature e#ects onwater permittivity based on weighted averages :soil bulk dielectric permittivity measured by

the allophane analogue. Journal of Hydrology,

time domain reﬂectometry : Experimental evi--+0 : 32ῌ+*1.

dence and hypothesis development. Water Resour.

Riley, T.C., T.A. Endreny and J.D. Halfman (,**0) :Monitoring soil moisture and water table heightRes., -/ : -0+ῌ-03.

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with a low-cost data logger. Computers & Geosci-

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ences, -, : +-/ῌ+.*.

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Robinson, D.A., S.B. Jones, J.M. Wraith, D. Or and S.P.

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