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	Provedor de dados Scientia Agricola (2) Autor Hartmann,R. (2) Reichardt,K. (2) Bacchi,O.O.S. (1) Gabriels,D. (1) Michiels,P. (1) Verplancke,H. (1) Villagra,M. M. (1) Villagra,M.M. (1) Mais... Palavra-chave Crop coefficient (1) Evapotranspiration (1) Hydraulic conductivity (1) Soil variability (1) Spatial variability (1) Tipo do documento Info:eu-repo/semantics/article (2) Ano 1994 (2) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Field determined variation of the unsaturated hydraulic conductivity functions using simplified analysis of internal drainage experiments Scientia Agricola Villagra,M. M.; Michiels,P.; Hartmann,R.; Bacchi,O.O.S.; Reichardt,K.. Experimentally determined values of unsaturated soil hydraulic conductivity are presented for an Alfisol of the county of Piracicaba, S.P., Brazil. Simultaneous measurements of soil water content and pressure head are made along a 125 m transect within an irrigated field during the internal drainage process. Calculations of the soil hydraulic conductivity were made using the instantaneous profile method (Watson, 1966) and the unit gradient method (LIBARDI et al., 1980). The spatial variability of the soil hydraulic conductivity manifested along the transect indicates the need to develop a field method to measure K(theta) within prescribed fiducial limits, taking into account quantitative evaluation of spatial and temporal variances associated with the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil variability; Hydraulic conductivity. Ano: 1994 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100018 Estimating crop coefficients for corn during an evapotranspiration experiment on an oxisol in Brazil Scientia Agricola Villagra,M.M.; Gabriels,D.; Verplancke,H.; Hartmann,R.; Reichardt,K.. Soil water balance components were measured during two periods (from 1989 to 1991) on a Dark Red Latosol (oxisol) in Piracicaba,SP, Brazil. The change in soil water storage and the soil water fluxes at the lower limit of the rooting zone were calculated for a transect of 25 observation plots. Hydraulic head gradients were determined by tensiometer measurements. Soil water flux densities were estimated through Darcy's equation. The actual evapotranspiration of the crops and weeds and the actual evaporation of bare soil were obtained from the water balance equation and this for two periods under different crop rotations. For the first period the sequence was bare soil-corn-weeds and for the second period it was stubble mulch-weeds-corn. For assessing the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Crop coefficient; Evapotranspiration; Spatial variability. Ano: 1994 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200012 Registros recuperados: 2 Primeira ... 1 ... Última

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