IJKLM !NOP OPQR
J. Jpn. Soc. Soil Phys.
p-O }
No. 30, p. /+F/0 G,**.H

 ./     : ,**-  +/  ++  ,,   : 

TDR  

Assessing TDR Method for Simultaneous
Monitoring of Water and Solute in Dune Soil         A B/vwy

Hossein DEHGHANISANIJῌ CDῌ]

 !"# TDR $%&'(Time domain reﬂectometry (TDR) is rapidly be-) + *"+ (,-./0 1"#2&coming a popular method for measuring water con-'3 ()-456+ (7 89(tent and solute concentration in the laboratory as

: ; 8 (:well as in the ﬁeld.

<='3 9(7 *.*/

Success or failure of TDR to>*.+ cm- cm?- -()*@+ A B!C./

measure solute resident concentration depends on

DE- "&+

the accuracy of the calibration used.

($7F< -*>.* cm -$()G *.+ cm- cm?- 56 *.-/>*.. cm- cm?-

In this study,

the accuracy of TDR method for monitoring water

CHI 4&+ J;K + / B!C./&#"and solute simultaneously, in dune soil was tested.

LMN*O&'3 ,0-#$7(0PQR

Test results showed that the TDR method has highL+(G . %56 / ST 5U#+ V< 1*>3* cm&WDEX;G'(&'3accuracy for monitoring soil water content, but it hasless accurate for monitoring soil electrical conductiv- : TDR, ()+ (0+ ,0

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

 : TDR, soil water content, soil solution,

 !"#$%&'()* +,-.
YZ  )[*  \YZ *dune soil, calibration.

+,]^_ῌ-.`abcd efghijklmn/o!UEp)

/0123456789:;<=>?@ῌABCD+E0-1q*23;&#r/s4*/t'3 u&')

YZ  )[*  EF

vwxy-z56;7{|)87+ p9}*~yYZ *;&#T#:U6=EX;GO<='3 p)
; 0;ῌ)<y-)}7=L+ 4
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*¯¹'3 º-(»+ G8 -*>/*῎-*ῌ?/*¢ $(<¦'¯M!"#+ ?

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52 :     Burhanuddin RASYID

 

1j0j\ 8ῌ8
Wood bark as a side-product of agriculture can beused as organic amendment in nutrients recycle and ῌ soil improvement. The e#ect of wood bark incorporation to three-phase composition of soils, soil resist-ance, hydraulic conductivity, and water retention!"#ῌ$%&ῌ'(was investigated on clay and sandy soil. This study*

indicated that in soils tested, both samples have+,-ῌ . /012.34 )di#erent tendencies when wood bark is incorporated

567-8

9 :;.<=  

to these soils. The di#erence is recognized related tῌha  A  ῍ > ?@AB 

to the basic of physical properties.

2@ /345CD7EF1G>@HI+ : Wood bark, three-phase composition,,-8 <=.345J!7EKLM"5NO->

soil resistance, hydraulic conductivity.

GP Ao  tῌha @QR#$STUAO-8G.G>9 Ao @%F&'U9 (VW/"6@)XUFRF-YZ[*\12@]R^.+,@-_`,1 a@b+F>

Fc?d@A1>J0`,-8 : ef.gῌ 2345678 9 9:;<=>?!4@AB/h01j1jk0jl )G]N/h01j& lj\ 2¡¢^_`ῌ£6a¤



GU9Abc¥¦> de5f§}¨-!"#$%&'()*+,-./ 01/h0i1j1jk0jl23K4ῌ56 7ῌm8 9.:j;<=9 >n.[*o?/1p^34

yg©hzi".cªj«/¬FE­k7-8 `i®¯°. a Abc¥¦U¥+,-clmn m±.cªY²9,³,mcªY².
3+῍ 22῍ 22῍ 5oY-8 ´- de5p=7-Abcµq.cl mn m±.cªY²9r&s¶t. 0῍ +*῍ 2῍ UAO-8 o&C.

5018 q@ >n[*5A\rstuvu.B9a Abc¥¦U¥+,-cl mn m

CDwxu /yBEz\1{|/A1>F},EF1±.cªY²9,³,mAbcªY². 3+῍ 3,῍wxu ~F=8 GU9 HI7-@2.῍ 5oY-8 G,`yBAbc¥¦> de>.f

JKW`LJK/[N\1=M/FE >n[*rs§}¨9AbcµW`yg©hzi"5"tuvu "dy"N .wxu ~F=@u\1./·a;Rvw>xyUp-8.yc/Ez\1W57-8 . a JK : Abc¥¦

U9wxu ~F=@O/o,-./P7 LJK±de Vz n U9wxu ~F=9Q+,RWO-8 +`/ R
ST@/U\1 VWBX.Y5
7-LJKU9 "N.B@JK/ZO7^]7-8 : >n[* "rstuvu wxu ~F=, : + CDE!FG5HI /h0i1j1jk[0jkl{|}_T/h0i1j1j0jl

Soil-Water and Compaction Properties ofSoils as Inﬂuenced by Incorporationof Wood Bark
1j1jk[0jl56 7ῌm8 9wtv~/?\1¸¹..%^9 wt
v~5º±º >§R7 wtv
~.=U.S/ ~.»V"/y1 ./ ²KJ³´µ¶·¸ µON¹´ºH »K67 »HT¼

    !"# $%&'()+,-.ῌ/ 01 2345
6789:ῌ";:< =>'  *+, - ./0 123 4"53

53

ggh#rsh67I

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 ! ! :;<  z  ,@p ' &8qKPῌJ=>?@ 5-3A3.BCP _r  _`Es 5- pPD EF ' :z tT"$ " uq:v&"w8r
xM3 D G! , : + 9. nH3'uq&yz :v&  kF¡¢#KPῌJP_n9<i' &' {| }~:£^ῌp¡¢#:v&<i' yz^ &:vHI"J#J$ %KLῌ&'()5 53'p¡¢ M+ =>b.[\*&"JM+,67NO P-QR ¤}~x^ #¥¦]8$i'" ST."/0"UV12WXYZ34

=e  i' &:v 5u 56783[\9083:]
 ;^%<_ D=`a'=>b. qc

/ m &8 ' §¨ ;" 53' : ,@© uqr KJ
P _*./d*.0  D? *., cm @8e98$ "  A

BfC Bf   gq῍*.1.h 8 *.0 cm @"UVi' j3 YZ12S"USTg*.+ mm @h BC 83DE" <_()kFl 'a#53' : YZ

D=Time Domain Reﬂectometry Coil Probe for
Measuring Soil Water Characteristic Curveof Water Repellent Volcanic Ash Soils

D? 12ª«"JtJ$ B. AUNGῌ ¬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

$"J:mGnH67I -J oaggregated soils. We used Time Domain Re-pq"JrsKtJ$ LMNu

ﬂectometry (TDR) measurement of soil water con-v!bD8  OF^%:PwQxRwyBS."zjtent.

Two sets of calibration for TDR --rods probes

and coil probes were provided.

The physics of the

{4T|U}z 'a  V~ phenomena of main drying process and three wett-

WX:;< RwyBS$YZ

ing processes were studied with soil water character-' - +h WX[8 \OFy"]V 2 ^y"]V:_z  ,h d-./

istic curve.

Finally, the e#ect of hysteresis and thevolumetric content of entrapped air can be deter-d-/ kPa  OF8 BS 'y"` mined by soil water characteristic curve.

zVa=8y"BSz  -h d-/ kPa ^8 : Volcanic ash soil, Soil water repellency,

yBS "V y` f%

TDR coil probe, Soil water characteristic

a=BS."&  .h d-+*- kPa ^8 curve.

y2 V\ῌb3 yBS  'acdz j#"ei' :  OF v! :Pw
BSfI \?@ABCD=>EFG
HIJ KL*&"JM+,67NO P-QR ]V. ­"®3¯ῌ°K± Uy ¶ 30 ¼ ,**.

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"#$%& - !!'  ()*+,'-"./ 0# 121  * NaCl$ 3#4

5/ 678 9AA;. X:|gI
guhp;I y&./ : efguh DC"|Ek #jk : *%;<= >X:|&'?;(@A5/ TDR BCDEF)

G*. ; +* dSῌm H

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