Calibration of a TDR equipment to moisture measurement in soils

Detalhes bibliográficos
Autor(a) principal: Tommaselli, José Tadeu Garcia
Data de Publicação: 2001
Outros Autores: Bacchi, Osny Oliveira Santos
Tipo de documento: Artigo
Idioma: por
Título da fonte: Pesquisa Agropecuária Brasileira (Online)
Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/6235
Resumo: The aim of this study was to obtain the calibration curves for a TDR (Time Domain Reflectometry) equipment using five soils from the Piracicaba, SP, Brazil. The suitability of the built-in and generic calibration curves was also tested. Individual fitted curves for each soil showed determination coefficients (R2) of about 0.99 and the fitted curve for all five soils together showed a value of R2 = 0.976. The standard error of estimate analysis has pointed out that generic curves are not suitable for more sensible applications, such as for absolute determination of soil water content. Comparison tests among fitted curves, generic curve and the equipment curve, pointed out that the first one is superior to the others. This study showed also that the equipment built-in calibration curve is not suitable for soil water content determinations for the five studied soils.
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spelling Calibration of a TDR equipment to moisture measurement in soilsCalibração de um equipamento de TDR para medida de umidade de solosdielectric properties; soil water content; measuring instrumentspropriedades dielétricas; conteúdo de água do solo; instrumento de mediçãoThe aim of this study was to obtain the calibration curves for a TDR (Time Domain Reflectometry) equipment using five soils from the Piracicaba, SP, Brazil. The suitability of the built-in and generic calibration curves was also tested. Individual fitted curves for each soil showed determination coefficients (R2) of about 0.99 and the fitted curve for all five soils together showed a value of R2 = 0.976. The standard error of estimate analysis has pointed out that generic curves are not suitable for more sensible applications, such as for absolute determination of soil water content. Comparison tests among fitted curves, generic curve and the equipment curve, pointed out that the first one is superior to the others. This study showed also that the equipment built-in calibration curve is not suitable for soil water content determinations for the five studied soils.Este estudo visou à obtenção das curvas de calibração de um equipamento de TDR (Time Domain Reflectometry) em cinco solos da região de Piracicaba, SP, e testou a adequação da calibração interna do equipamento e das curvas genéricas de calibração. As curvas ajustadas, em cada solo separadamente, apresentaram coeficientes de determinação (R2) da ordem de 0,99, e a curva ajustada para o conjunto de dados dos cinco solos apresentou R2 = 0,976. A análise de erros-padrão de estimativa mostrou que as curvas genéricas não se prestam às aplicações mais sensíveis, tais como na determinação absoluta do conteúdo de água do solo. Os testes de comparação entre as curvas ajustadas, a curva genérica e a curva embutida no equipamento mostraram que a primeira é superior às demais. O estudo mostrou, também, que a curva de calibração embutida no equipamento é inadequada para as determinações de umidade nos cinco solos estudados.–Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraTommaselli, José Tadeu GarciaBacchi, Osny Oliveira Santos2001-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/6235Pesquisa Agropecuaria Brasileira; v.36, n.9, set. 2001; 1145-1154Pesquisa Agropecuária Brasileira; v.36, n.9, set. 2001; 1145-11541678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/6235/3300info:eu-repo/semantics/openAccess2010-08-09T19:05:15Zoai:ojs.seer.sct.embrapa.br:article/6235Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2010-08-09T19:05:15Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Calibration of a TDR equipment to moisture measurement in soils
Calibração de um equipamento de TDR para medida de umidade de solos
title Calibration of a TDR equipment to moisture measurement in soils
spellingShingle Calibration of a TDR equipment to moisture measurement in soils
Tommaselli, José Tadeu Garcia
dielectric properties; soil water content; measuring instruments
propriedades dielétricas; conteúdo de água do solo; instrumento de medição
title_short Calibration of a TDR equipment to moisture measurement in soils
title_full Calibration of a TDR equipment to moisture measurement in soils
title_fullStr Calibration of a TDR equipment to moisture measurement in soils
title_full_unstemmed Calibration of a TDR equipment to moisture measurement in soils
title_sort Calibration of a TDR equipment to moisture measurement in soils
author Tommaselli, José Tadeu Garcia
author_facet Tommaselli, José Tadeu Garcia
Bacchi, Osny Oliveira Santos
author_role author
author2 Bacchi, Osny Oliveira Santos
author2_role author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Tommaselli, José Tadeu Garcia
Bacchi, Osny Oliveira Santos
dc.subject.por.fl_str_mv dielectric properties; soil water content; measuring instruments
propriedades dielétricas; conteúdo de água do solo; instrumento de medição
topic dielectric properties; soil water content; measuring instruments
propriedades dielétricas; conteúdo de água do solo; instrumento de medição
description The aim of this study was to obtain the calibration curves for a TDR (Time Domain Reflectometry) equipment using five soils from the Piracicaba, SP, Brazil. The suitability of the built-in and generic calibration curves was also tested. Individual fitted curves for each soil showed determination coefficients (R2) of about 0.99 and the fitted curve for all five soils together showed a value of R2 = 0.976. The standard error of estimate analysis has pointed out that generic curves are not suitable for more sensible applications, such as for absolute determination of soil water content. Comparison tests among fitted curves, generic curve and the equipment curve, pointed out that the first one is superior to the others. This study showed also that the equipment built-in calibration curve is not suitable for soil water content determinations for the five studied soils.
publishDate 2001
dc.date.none.fl_str_mv 2001-09-01
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/6235
url https://seer.sct.embrapa.br/index.php/pab/article/view/6235
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/6235/3300
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
dc.source.none.fl_str_mv Pesquisa Agropecuaria Brasileira; v.36, n.9, set. 2001; 1145-1154
Pesquisa Agropecuária Brasileira; v.36, n.9, set. 2001; 1145-1154
1678-3921
0100-104x
reponame:Pesquisa Agropecuária Brasileira (Online)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Pesquisa Agropecuária Brasileira (Online)
collection Pesquisa Agropecuária Brasileira (Online)
repository.name.fl_str_mv Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv pab@sct.embrapa.br || sct.pab@embrapa.br
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