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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.
/01�2345678�9:;<=>?@�ABCD�+E
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J. Jpn. Soc. Soil Phys.
�p-O}No. 30, p. /+F/0 G,**.H
IJK�LM !NOP OPQR
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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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#�, 5��X,��,@�8'��mn�o�z��� ,@�p�'&8��q��KP��JP_�r��� �_�`�Es 5-���pP� �ztT"$"� uq���:v�&"�w8r�x��M�3��� �nH�3'uq���&yz���:v��&�� kF¡¢#�KP��JP_�n9�<i'� &'� {|��}~�:£�^���p¡¢#:v�&�<i'� yz�^�&:v 5 53'�p¡¢� M+��� =>b�.[\� �¤��}~x�^��#¥¦�]8$i'"� ����=����e��� i'� �&:v 5�u�/m&8���'§�¨����� ;" 53'������ : ,@�©�� uq��r�� ����KJ
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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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