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- Title
Condutividade hidráulica de um Latossolo Vermelho Amarelo, nãosaturado, utilizando-se sonda de nêutrons.
- Authors
Carvalho, Laércio Alves; Libardi, Paulo Leonel
- Abstract
The objective of this study was to determine the unsaturated hydraulic conductivity, using a neutron probe, of a clay sandy Oxisol. The study was carried out in the city of Piracicaba, State of São Paulo, Brazil (22°42' 43.3" S, 47o 37' 10.4" W, 546 m). The dimensions of the experimental plot were 45 m x 15 m, in which 40 aluminum tubes were installed in order to access a neutron probe to measure the soil water content at the depths of 0.2, 0.4, 0.6, 0.8 and 1.0 m and, then, calculate the soil water storage of the 0 - 1.0 m soil layer. The distribution of these tubes was made in grids of four columns by ten rows, in spacing of 5 x 5 m. The K(θ ) functions were determined in the 40 points from regression analyses of θ as function lnt and hz as a function of lnt, being K the hydraulic conductivity, θ the volumetric soil water content, hz the soil water storage in the 0 - Z m layer, and t the soil water redistribution time. The neutron probe proved to be an efficient equipment in determining soil water contents, in the instantaneous profile method for determination of the K(θ ) function in homogeneous soil.
- Subjects
PIRACICABA (Brazil); BRAZIL; SOIL testing; SOIL composition; SOIL permeability; SOIL moisture; OXISOLS; UNSATURATED compounds; REGRESSION analysis
- Publication
Acta Scientiarum: Biological Sciences, 2010, Vol 32, Issue 1, p153
- ISSN
1679-9283
- Publication type
Article
- DOI
10.4025/actasciagron.v32i1.909