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Registro Completo |
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Biblioteca(s): |
Embrapa Tabuleiros Costeiros. |
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Data corrente: |
10/09/1998 |
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Data da última atualização: |
10/09/1998 |
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Autoria: |
COELHO, F. E.; OR, D. |
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Título: |
Applicability of analytical solutions for flow from point sources to drip irrigation management |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Soil Science Society of America Journal, v.61, n.5, p.1331-1341, 1997. |
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Idioma: |
Inglês |
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Conteúdo: |
The design and management of drip irrigation sytems requires understanding of water distribution and dinamics within the wetted soil volume.This information can be obtained by means of analytical or numerical solutions of the multidimensional Richards equation.Though steady-statesolutions have been advocated as design tools for drip irrigation, very little information about their performance under practical field conditions is available. The objective of this study was to evaluate the applicability of analytical solutions for steady and transient flows from point sources to practical drip irrigation management. The emphasis was on the adaptive and dynamic aspects of management vs. conservative design considerations. Experiments were carried out in containers and in the field to determine steady-state attainment rates and to provide information on spatial and temporal dynamics of water content and matric potential during irrigation cycles. The main results were:(i) analytical solutions for steady and transient flow conditions predicted reasonably well meaasured distributions of water content and matric potential in the absence of plants;(ii)steady flow conditions were seldom realized under practical drip irrigation ;(iii)transient flow solutions provided a more realistic description of soil water dynamic and (iv)introducing uptake terms into transient analytical solutions provided a simple and effective framework for capturing soil water dynamics in the presence of plant roots. MenosThe design and management of drip irrigation sytems requires understanding of water distribution and dinamics within the wetted soil volume.This information can be obtained by means of analytical or numerical solutions of the multidimensional Richards equation.Though steady-statesolutions have been advocated as design tools for drip irrigation, very little information about their performance under practical field conditions is available. The objective of this study was to evaluate the applicability of analytical solutions for steady and transient flows from point sources to practical drip irrigation management. The emphasis was on the adaptive and dynamic aspects of management vs. conservative design considerations. Experiments were carried out in containers and in the field to determine steady-state attainment rates and to provide information on spatial and temporal dynamics of water content and matric potential during irrigation cycles. The main results were:(i) analytical solutions for steady and transient flow conditions predicted reasonably well meaasured distributions of water content and matric potential in the absence of plants;(ii)steady flow conditions were seldom realized under practical drip irrigation ;(iii)transient flow solutions provided a more realistic description of soil water dynamic and (iv)introducing uptake terms into transient analytical solutions provided a simple and effective framework for capturing soil water dynamics in the presence of plant root... Mostrar Tudo |
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Palavras-Chave: |
Analytical solution; Aplicabilidade; Applicability; Plant roots; Solucao analitica. |
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Thesagro: |
Irrigação. |
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Thesaurus Nal: |
irrigation management. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02138naa a2200217 a 4500
001 1354706
005 1998-09-10
008 1997 bl uuuu u00u1 u #d
100 1 $aCOELHO, F. E.
245 $aApplicability of analytical solutions for flow from point sources to drip irrigation management
260 $c1997
520 $aThe design and management of drip irrigation sytems requires understanding of water distribution and dinamics within the wetted soil volume.This information can be obtained by means of analytical or numerical solutions of the multidimensional Richards equation.Though steady-statesolutions have been advocated as design tools for drip irrigation, very little information about their performance under practical field conditions is available. The objective of this study was to evaluate the applicability of analytical solutions for steady and transient flows from point sources to practical drip irrigation management. The emphasis was on the adaptive and dynamic aspects of management vs. conservative design considerations. Experiments were carried out in containers and in the field to determine steady-state attainment rates and to provide information on spatial and temporal dynamics of water content and matric potential during irrigation cycles. The main results were:(i) analytical solutions for steady and transient flow conditions predicted reasonably well meaasured distributions of water content and matric potential in the absence of plants;(ii)steady flow conditions were seldom realized under practical drip irrigation ;(iii)transient flow solutions provided a more realistic description of soil water dynamic and (iv)introducing uptake terms into transient analytical solutions provided a simple and effective framework for capturing soil water dynamics in the presence of plant roots.
650 $airrigation management
650 $aIrrigação
653 $aAnalytical solution
653 $aAplicabilidade
653 $aApplicability
653 $aPlant roots
653 $aSolucao analitica
700 1 $aOR, D.
773 $tSoil Science Society of America Journal$gv.61, n.5, p.1331-1341, 1997.
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