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Assessing TDR Method for Simultaneous

Monitoring of Water and Solute in Dune Soil

A���B/��vw�yHossein DEHGHANISANIJ�CD��]���

Time domain reflectometry (TDR) is rapidly be-

coming a popular method for measuring water con-

tent and solute concentration in the laboratory as

well as in the field. Success or failure of TDR to

measure solute resident concentration depends on

the accuracy of the calibration used. In this study,

the accuracy of TDR method for monitoring water

and solute simultaneously, in dune soil was tested.

Test results showed that the TDR method has high

accuracy for monitoring soil water content, but it has

less accurate for monitoring soil electrical conductiv-

ity across a water content range of about�*.*- cm-/

cm-.

����� : TDR, soil water content, soil solution,

dune soil, calibration.

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J. Jpn. Soc. Soil Phys.

�p-O}No. 30, p. /+F/0 G,**.H

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Soil-Water and Compaction Properties of

Soils as Influenced by Incorporation

of Wood Bark

��1j1jk[�0j��l

Burhanuddin RASYID

��1j0j\ 8����8���Wood bark as a side-product of agriculture can be

used as organic amendment in nutrients recycle and

soil improvement. The e#ect of wood bark incorpo-

ration to three-phase composition of soils, soil resist-

ance, hydraulic conductivity, and water retention

was investigated on clay and sandy soil. This study

indicated that in soils tested, both samples have

di#erent tendencies when wood bark is incorporated

to these soils. The di#erence is recognized related

to the basic of physical properties.

����� : Wood bark, three-phase composition,

soil resistance, hydraulic conductivity.

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Time Domain Reflectometry Coil Probe for

Measuring Soil Water Characteristic Curve

of Water Repellent Volcanic Ash Soils

ª«"JtJ$ B. AUNG��� ¬Despite being reported about water repellent soils

in many countries, mostly past researches based on

sandy soils. This study gives an account for various

soil water repellency classes of volcanic ash

aggregated soils. We used Time Domain Re-

flectometry (TDR) measurement of soil water con-

tent. Two sets of calibration for TDR --rods probes

and coil probes were provided. The physics of the

phenomena of main drying process and three wett-

ing processes were studied with soil water character-

istic curve. Finally, the e#ect of hysteresis and the

volumetric content of entrapped air can be deter-

mined by soil water characteristic curve.

����� : Volcanic ash soil, Soil water repellency,

TDR coil probe, Soil water characteristic

curve.

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