Construction and calibration of TDR probes for volumetric water content estimation in a Distroferric Red Latosol
The determination of volumetric water content of soils is an important factor in irrigation management. Among the indirect methods for estimating, the time-domain reflectometry (TDR) technique has received a significant attention. Like any other technique, it has advantages and disadvantages, but its greatest disadvantage is the need of calibration and high cost of acquisition. The main goal of this study was to establish a calibration model for the TDR equipment, Trase System Model 6050X1, to estimate the volumetric water content in a Distroferric Red Latosol. The calibration was carried out in a laboratory with disturbed soil samples under study, packed in PVC columns of a volume of 0.0078m³. The TDR probes were handcrafted with three rods and 0.20m long. They were vertically installed in soil columns, with a total of five probes per column and sixteen columns. The weightings were carried out in a digital scale, while daily readings of dielectric constant were obtained in TDR equipment. The linear model θν = 0.0103 Ka + 0.1900 to estimate the studied volumetric water content showed an excellent coefficient of determination (0.93), enabling the use of probes in indirect estimation of soil moisture.
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Associação Brasileira de Engenharia Agrícola
2013
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oai:scielo:S0100-691620130005000042013-11-21Construction and calibration of TDR probes for volumetric water content estimation in a Distroferric Red LatosolSoncela,RosimaldoSampaio,Silvio C.Vilas Boas,Marcio A.Tavares,Maria H. F.Smanhotto,Adriana apparent dielectric constant time-domain reflectometry soil water content The determination of volumetric water content of soils is an important factor in irrigation management. Among the indirect methods for estimating, the time-domain reflectometry (TDR) technique has received a significant attention. Like any other technique, it has advantages and disadvantages, but its greatest disadvantage is the need of calibration and high cost of acquisition. The main goal of this study was to establish a calibration model for the TDR equipment, Trase System Model 6050X1, to estimate the volumetric water content in a Distroferric Red Latosol. The calibration was carried out in a laboratory with disturbed soil samples under study, packed in PVC columns of a volume of 0.0078m³. The TDR probes were handcrafted with three rods and 0.20m long. They were vertically installed in soil columns, with a total of five probes per column and sixteen columns. The weightings were carried out in a digital scale, while daily readings of dielectric constant were obtained in TDR equipment. The linear model θν = 0.0103 Ka + 0.1900 to estimate the studied volumetric water content showed an excellent coefficient of determination (0.93), enabling the use of probes in indirect estimation of soil moisture.info:eu-repo/semantics/openAccessAssociação Brasileira de Engenharia AgrícolaEngenharia Agrícola v.33 n.5 20132013-10-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000500004en10.1590/S0100-69162013000500004 |
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Soncela,Rosimaldo Sampaio,Silvio C. Vilas Boas,Marcio A. Tavares,Maria H. F. Smanhotto,Adriana |
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Soncela,Rosimaldo Sampaio,Silvio C. Vilas Boas,Marcio A. Tavares,Maria H. F. Smanhotto,Adriana Construction and calibration of TDR probes for volumetric water content estimation in a Distroferric Red Latosol |
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Soncela,Rosimaldo Sampaio,Silvio C. Vilas Boas,Marcio A. Tavares,Maria H. F. Smanhotto,Adriana |
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Soncela,Rosimaldo |
title |
Construction and calibration of TDR probes for volumetric water content estimation in a Distroferric Red Latosol |
title_short |
Construction and calibration of TDR probes for volumetric water content estimation in a Distroferric Red Latosol |
title_full |
Construction and calibration of TDR probes for volumetric water content estimation in a Distroferric Red Latosol |
title_fullStr |
Construction and calibration of TDR probes for volumetric water content estimation in a Distroferric Red Latosol |
title_full_unstemmed |
Construction and calibration of TDR probes for volumetric water content estimation in a Distroferric Red Latosol |
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construction and calibration of tdr probes for volumetric water content estimation in a distroferric red latosol |
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The determination of volumetric water content of soils is an important factor in irrigation management. Among the indirect methods for estimating, the time-domain reflectometry (TDR) technique has received a significant attention. Like any other technique, it has advantages and disadvantages, but its greatest disadvantage is the need of calibration and high cost of acquisition. The main goal of this study was to establish a calibration model for the TDR equipment, Trase System Model 6050X1, to estimate the volumetric water content in a Distroferric Red Latosol. The calibration was carried out in a laboratory with disturbed soil samples under study, packed in PVC columns of a volume of 0.0078m³. The TDR probes were handcrafted with three rods and 0.20m long. They were vertically installed in soil columns, with a total of five probes per column and sixteen columns. The weightings were carried out in a digital scale, while daily readings of dielectric constant were obtained in TDR equipment. The linear model θν = 0.0103 Ka + 0.1900 to estimate the studied volumetric water content showed an excellent coefficient of determination (0.93), enabling the use of probes in indirect estimation of soil moisture. |
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Associação Brasileira de Engenharia Agrícola |
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2013 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000500004 |
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