Data/hora: 04/06/2024 06:34:50

Biblioteca(s): | Embrapa Meio-Norte.
Data corrente: | 19/11/1997
Data da última atualização: | 04/01/2019
Autoria: | COELHO, E. F.; OR, D.
Afiliação: | EMBRAPA-CPAMN.
Título: | Applicability of analytica 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 systems requires understanding of water distribution and dynamics within the wetted soil volume. The information can be obtained by means of analytical or numerical solutions of the multidimensional Richards equation. Though steady-state sulutions have bean 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 the adaptive and dynamic aspects of managemente vs. conservative disegn 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 irrigationcycles. The main results were:(i) analytical solutions for steady and transient flow conditions predicted reasonably well measured 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 dynamics; and (iv) introducing uptake termsinto transient analytical solutions provided a simple and effective framework for capturing soil water dynamics in the presence of plant roots.
Palavras-Chave: | Analytical solution; Drip irrigation; Gotejamento; Point source; Ponto forte; Solucao analitica.
Thesagro: | Irrigação.
Thesaurus Nal: | irrigation.
Categoria do assunto: | --
Registro original: | Embrapa Meio-Norte (CPAMN)
Exemplares: | CPAMN - (2069-1) - UPC - AP - PP - 631.405 -  - 631.405 - DIS