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Acta agriculturae Slovenica, 85 - 2, november 2005 str. 359 – 374

Agrovoc Descriptors: soil, moisture content, soil water content, sensors,

measurement, clay soils, silty soils, sandy soils

Agris Category Codes: P33

COBISS code 1.01

Comparison of laboratory TDR soil water measurements

Vesna ZUPANC

, Gregor ADAM

, Marina PINTAR

Received: 10- 9-2005, accepted 10-10-2005

Delo je prispelo: 10- 9-2005, sprejeto 10-10-2005

ABSTRACT

Reliable soil moisture sensors are essential for agricultural application. Time Domain

Reflectometry (TDR) is a useful method for nondestructive, continuous measurements of soil

water content. Laboratory measurements of soil volumetric water content by the TDR 100

Time Domain Reflectometer were compared to gravimetric measurements in three soils, Clay

Loam, Silt Loam and Sand soil. Comparison between original and homemade 10 cm and 20

cm rods was made. TDR 100 gave good results in Clay Loam and Silt Loam soil and over

estimated VWC in Sand soil. Results showed little or no difference between original and

homemade sensor measurements.

Key words: volumetric water content, soil moisture sensor, TDR

IZVLEČEK

PRIMERJAVA LABORATORIJSKIH MERITEV VODE V TALNEM SUBSTRATU S TDR

Zanesljivi senzorji za merjenje vlage v tleh so v kmetijstvu nujni. Time Domain Reflectometry

(TDR) je metoda, ki omogoča kontinuirano merjenje vlage v tleh brez rušenja talnega profila.

Laboratorijske meritve volumske vsebnosti vode, izvedene s TDR 100 Reflectometrom, smo

primerjali z gravimetrično metodo v glinasto ilovnatih, meljasto ilovnatih ter peščenih tleh.

Primerjali smo meritve narejene z izvirnimi ter doma narejenimi 10 cm in 20 cm sondami.

TDR 100 je pokazal dobre rezultate v glinasto ilovnatih in meljasto ilovnatih tleh, v peščenih

tleh so bile izmerjene vrednosti višje od standarda. Rezultati kažejo malo ali nič razlik med

meritvami, opravljenimi z izvirnimi in doma narejnimi sondami.

Ključne besede: volumska vsebnost vode, senzor za merjenje vlage v tleh, TDR

1 INTRODUCTION

Many plant-soil-water and hydrological investigations depend on accurate

measurement of soil water content. Often undergoing study of the processes requires

continuous measurement. Time Domain Reflectometry (TDR) became known as a

Assist., PhD., Biotechnical faculty, Department for Agronomy, Center for agrohydrology

and land reclamation, Jamnikarjeva 101, 1000 Ljubljana, Slovenia vesna.zupanc@bf.uni-

lj.si

ADACHEM doo, Ulica generala Levičnika 34i 6000Koper

Assist. Prof., PhD., Biotechnical faculty, Department for Agronomy, Center for

agrohydrology and land reclamation, Jamnikarjeva 101, 1000 Ljubljana, Slovenia

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Inhaltsverzeichnis

Seite 1

Acta agriculturae Slovenica, 85 - 2, november 2005 str. 359 – 374 Agrovoc Descriptors: soil, moisture content, soil water content, sensors, measure

Seite 2

Acta agriculturae Slovenica, 85 - 2, november 2005 368 Comparison of the TDR 100 measurements and gravimetrically determined VWC (Figure 4)

Seite 3

ZUPANC, V. in sod.: Comparison of laboratory TDR soil water measurements 3690102030405001020304050Gravimetric Method (Vol %)Sensor Measurements (V

Seite 4

Acta agriculturae Slovenica, 85 - 2, november 2005 370 010203040500 1020304050Gravimetric Method (Vol %)Sensor Measurements (Vol %)TDR 100 20b Figure

Seite 5

ZUPANC, V. in sod.: Comparison of laboratory TDR soil water measurements 3710102030405001020304050Gravimetric Method (Vol %)Sensor Measurements (V

Seite 6

Acta agriculturae Slovenica, 85 - 2, november 2005 372 0102030405001020304050Gravimetric Method (Vol %)Sensor Measurements (Vol %)TDR 100 20a Figure

Seite 7

ZUPANC, V. in sod.: Comparison of laboratory TDR soil water measurements 3734 CONCLUSIONS TDR 100 Reflectometer measurements were compared to g

Seite 8

Acta agriculturae Slovenica, 85 - 2, november 2005 374 Topp, G.C, Davis, J.L. and Annan, A.P. 1980. Electromagnetic determination of soil water cont

Seite 9

Acta agriculturae Slovenica, 85 - 2, november 2005 360 useful method for nondestructive, continuous measurements of soil water content and bulk elec

Seite 10 - Sensor Measurements (Vol %)

ZUPANC, V. in sod.: Comparison of laboratory TDR soil water measurements 361 Figure 1: Scheme of TDR 100 experiment set, connections of PC with TD

Seite 11

Acta agriculturae Slovenica, 85 - 2, november 2005 362 buried at any orientation to the surface (Campbell Scientific, 2004). The measureme

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ZUPANC, V. in sod.: Comparison of laboratory TDR soil water measurements 363Table 1: Measurements of soil VWC TDR 100 Time Domain Reflectometer fo

Seite 13

Acta agriculturae Slovenica, 85 - 2, november 2005 364 Table 2: Measurements of soil VWC TDR 100 Time Domain Reflectometer for four different soil

Seite 14

ZUPANC, V. in sod.: Comparison of laboratory TDR soil water measurements 365Table 3: Measurements of soil VWC TDR 100 Time Domain Reflectometer fo

Seite 15

Acta agriculturae Slovenica, 85 - 2, november 2005 366 0102030405001020304050Gravimetric Method (Vol %)Sensor Measurements (Vol %)TDR 100 10a Figure

Seite 16

ZUPANC, V. in sod.: Comparison of laboratory TDR soil water measurements 3670102030405001020304050Gravimetric Method (Vol %)Sensor Measurements (V

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