A model for soil water and matric potential distribution under drip irrigation with water extraction by roots

Detalhes bibliográficos
Autor(a) principal: Coelho, Eugenio Ferreira
Data de Publicação: 1999
Outros Autores: Or, Dani
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/5159
Resumo: Water extraction by roots has been the main difficulty in describing and predicting a three-dimensional water distribution in the wetted volume under drip irrigation. The existing models consider either one-dimensional or multidimensional flow geometry, but in general, they are not easily accessible. This work introduces a two-dimensional semianalytical model for water content or potential distribution based on a superposition of the Warrick's analytical solution for transient flow from point source with a simple parametric model for root uptake. The model is also based on a local water balance, i.e., it considers a unit volume in a grid set in the wetted volume. The model results fitted well to the experimental data collected using corn plants in a Silt Loam Soil in containers. Simulations of water distribution in the wetted volume showed that the model allows to estimate and to describe soil water dynamics in the wetted volume during an irrigation cycle. This can improve significantly the evaluation of irrigation management, sensor placement studies and activity and distribution of roots in the wetted volume.
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spelling A model for soil water and matric potential distribution under drip irrigation with water extraction by rootsModelo de distribuição de água e de potencial matricial no solo sob gotejamento com extração de água por raízesdrip irrigation; soil-water relationship; root water uptake; simulationirrigação por gotejamento; relação solo-água; absorção de água por raízes; simulaçãoWater extraction by roots has been the main difficulty in describing and predicting a three-dimensional water distribution in the wetted volume under drip irrigation. The existing models consider either one-dimensional or multidimensional flow geometry, but in general, they are not easily accessible. This work introduces a two-dimensional semianalytical model for water content or potential distribution based on a superposition of the Warrick's analytical solution for transient flow from point source with a simple parametric model for root uptake. The model is also based on a local water balance, i.e., it considers a unit volume in a grid set in the wetted volume. The model results fitted well to the experimental data collected using corn plants in a Silt Loam Soil in containers. Simulations of water distribution in the wetted volume showed that the model allows to estimate and to describe soil water dynamics in the wetted volume during an irrigation cycle. This can improve significantly the evaluation of irrigation management, sensor placement studies and activity and distribution of roots in the wetted volume.A maior dificuldade em descrever e estimar a distribuição de água no bulbo molhado sob gotejamento reside na extração de água pelo sistema radicular, que é mais complexa devido à geometria de fluxo tridimensional. Os modelos existentes são, na maioria, unidimensionais ou multidimensionais de acessibilidade limitada. Este trabalho propõe um modelo semi-analítico para distribuição bidimensional de umidade ou de potencial no bulbo molhado, através da superposição da solução analítica de Warrick, para ponto-fonte em condições de regime não-permanente, com um modelo paramétrico de extração de água pelas raízes, considerando o balanço de água num volume unitário do solo. O modelo foi ajustado com sucesso a dados experimentais para a cultura do milho num solo franco-siltoso. Simulações de distribuição de água no bulbo molhado mostraram que o modelo permite estimar ou descrever a dinâmica de água do solo no bulbo molhado em qualquer tempo ao longo do ciclo de irrigação, o que pode contribuir significativamente na avaliação do manejo da irrigação, no estudo de posicionamento de sensores de umidade ou de potencial matricial, e em estudos relacionados à atividade das raízes no bulbo molhado.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraCoelho, Eugenio FerreiraOr, Dani1999-02-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/5159Pesquisa Agropecuaria Brasileira; v.34, n.2, fev. 1999; 225-234Pesquisa Agropecuária Brasileira; v.34, n.2, fev. 1999; 225-2341678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/5159/2351info:eu-repo/semantics/openAccess2010-07-13T17:28:10Zoai:ojs.seer.sct.embrapa.br:article/5159Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2010-07-13T17:28:10Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv A model for soil water and matric potential distribution under drip irrigation with water extraction by roots
Modelo de distribuição de água e de potencial matricial no solo sob gotejamento com extração de água por raízes
title A model for soil water and matric potential distribution under drip irrigation with water extraction by roots
spellingShingle A model for soil water and matric potential distribution under drip irrigation with water extraction by roots
Coelho, Eugenio Ferreira
drip irrigation; soil-water relationship; root water uptake; simulation
irrigação por gotejamento; relação solo-água; absorção de água por raízes; simulação
title_short A model for soil water and matric potential distribution under drip irrigation with water extraction by roots
title_full A model for soil water and matric potential distribution under drip irrigation with water extraction by roots
title_fullStr A model for soil water and matric potential distribution under drip irrigation with water extraction by roots
title_full_unstemmed A model for soil water and matric potential distribution under drip irrigation with water extraction by roots
title_sort A model for soil water and matric potential distribution under drip irrigation with water extraction by roots
author Coelho, Eugenio Ferreira
author_facet Coelho, Eugenio Ferreira
Or, Dani
author_role author
author2 Or, Dani
author2_role author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Coelho, Eugenio Ferreira
Or, Dani
dc.subject.por.fl_str_mv drip irrigation; soil-water relationship; root water uptake; simulation
irrigação por gotejamento; relação solo-água; absorção de água por raízes; simulação
topic drip irrigation; soil-water relationship; root water uptake; simulation
irrigação por gotejamento; relação solo-água; absorção de água por raízes; simulação
description Water extraction by roots has been the main difficulty in describing and predicting a three-dimensional water distribution in the wetted volume under drip irrigation. The existing models consider either one-dimensional or multidimensional flow geometry, but in general, they are not easily accessible. This work introduces a two-dimensional semianalytical model for water content or potential distribution based on a superposition of the Warrick's analytical solution for transient flow from point source with a simple parametric model for root uptake. The model is also based on a local water balance, i.e., it considers a unit volume in a grid set in the wetted volume. The model results fitted well to the experimental data collected using corn plants in a Silt Loam Soil in containers. Simulations of water distribution in the wetted volume showed that the model allows to estimate and to describe soil water dynamics in the wetted volume during an irrigation cycle. This can improve significantly the evaluation of irrigation management, sensor placement studies and activity and distribution of roots in the wetted volume.
publishDate 1999
dc.date.none.fl_str_mv 1999-02-01
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/5159
url https://seer.sct.embrapa.br/index.php/pab/article/view/5159
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/5159/2351
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.34, n.2, fev. 1999; 225-234
Pesquisa Agropecuária Brasileira; v.34, n.2, fev. 1999; 225-234
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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