Data/hora: 05/06/2024 09:56:36

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 14/11/2013
Data da última atualização: | 19/05/2023
Autoria: | SILVA, A. J. P. da; COELHO, E. F.
Afiliação: | ALISSON JADAVI PEREIRA DA SILVA, IF Baiano; EUGENIO FERREIRA COELHO, CNPMF.
Título: | Water percolation estimated with time domain reflectometry (TDR) in drainage lysimeters.
Ano de publicação: | 2013
Fonte/Imprenta: | Revista Brasileira de Ciência do Solo, v.37, p.920-927, 2013.
Idioma: | Inglês
Conteúdo: | Due to the difficulty of estimating water percolation in unsaturated soils, the purpose of this study was to estimate water percolation based on time-domain reflectometry (TDR). In two drainage lysimeters with different soil textures TDR probes were installed, forming a water monitoring system consisting of different numbers of probes. The soils were saturated and covered with plastic to prevent evaporation. Tests of internal drainage were carried out using a TDR 100 unit with constant dielectric readings (every 15 min). To test the consistency of TDRestimated percolation levels in comparison with the observed leachate levels in the drainage lysimeters, the combined null hypothesis was tested at 5 % probability. A higher number of probes in the water monitoring system resulted in an approximation of the percolation levels estimated from TDR-based moisture data to the levels measured by lysimeters. The definition of the number of probes required for water monitoring to estimate water percolation by TDR depends on the soil physical properties. For sandy clay soils, three batteries with four probes installed at depths of 0.20, 0.40, 0.60, and 0.80 m, at a distance of 0.20, 0.40 and 0.6 m from the center of lysimeters were sufficient to estimate percolation levels equivalent to the observed. In the sandy loam soils, the observed and predicted percolation levels were not equivalent even when using four batteries with four probes each, at depths of 0.20, 0.40, 0.60, and 0.80 m.
Palavras-Chave: | Water flow in the soil.
Thesagro: | Drenagem.
Thesaurus Nal: | Drainage; Soil; Soil water; Water flow.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
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