Field determined variation of the unsaturated hydraulic conductivity functions using simplified analysis of internal drainage experiments

Scientia Agricola

M. M. Villagra²  P. Michiels²  R. Hartmann²  O.o.s. Bacchi¹  K. Reichardt¹ 

[1] ,University Ghent Faculty of Agriculture and Applied Biological Sciences Department of Soil PhysicsBelgium

关键词: soil variability;    hydraulic conductivity;    variabilidade do solo;    condutividade hidráulica;   

DOI  :  10.1590/S0103-90161994000100018

来源: SciELO

【 摘 要 】

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 mathematical model, instrument calibration and soil properties.

【 授权许可】

CC BY   
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