Data/hora: 23/06/2024 19:44:15

Biblioteca(s): | Embrapa Tabuleiros Costeiros.
Data corrente: | 10/09/1998
Data da última atualização: | 10/09/1998
Autoria: | COELHO, F. E.; OR, D.
Título: | Applicability of analytical solutions for flow from point sources to drip irrigation management
Ano de publicação: | 1997
Fonte/Imprenta: | Soil Science Society of America Journal, v.61, n.5, p.1331-1341, 1997.
Idioma: | Inglês
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.
Palavras-Chave: | Analytical solution; Aplicabilidade; Applicability; Plant roots; Solucao analitica.
Thesagro: | Irrigação.
Thesaurus Nal: | irrigation management.
Categoria do assunto: | --
Registro original: | Embrapa Tabuleiros Costeiros (CPATC)
Exemplares: | CPATC - (1874-1) - ADC - AP - -- -  -  - 2000000000 - DIS