Field soil hydraulic conductivity: the simplification of the instantaneous profile method. / Condutividade hidráulica do solo no campo: as simplificações do método do perfil instantâneo.
AUTOR(ES)
Laercio Alves de Carvalho
DATA DE PUBLICAÇÃO
2003
RESUMO
The soil hydraulic conductivity is a parameter that quantifies the ability of the soil to conduct water along the soil profile. Hence its field determination is indispensable, since soil water movement is directly related to the field crop productions. Thus, the use of an adequate method that assesses the hydraulic conductivity as a function of soil-water content, the ( ) q K function, certainly will very contribute to a proper evaluation of results, mainly if it is considered the great variability of this function as a result of the natural variability of the soil characteristics. In this work, the instantaneous profile method was tested with the objective to evaluate a) the ( ) q K function taking and not taking into consideration the assumption of unit gradient and b) the behaviour of the ( ) q K function with respect to the pedological horizons of the soil. The determination of the function was made using mercury manometer tensiometers installed at the depths of 0.1; 0.2; 0.3; 0.4; 0.5; 0.6; 0.7; 0.8; 0.9; 1.0; 1.1 and 1.2 m and soil water retention curves determined for the same depths, in an Oxisol, located at experimental fields of Escola Superior de Agricultura Luiz de Queiroz, University de São Paulo, in Piracicaba (SP), Brasil (22 o 42 43,3 W and 47 o 37 10,4 S). The result analysis was made using an F-test in order to verify the paralelism, the intercept equality and the coincidence of the lnK versus q straight lines, taking and not taking account of the assumption of unit hydraulic gradient. Basides, similarity tests of the ( ) q K function were also made by the Willmott (1981) index. From the analysis of results, it could be concluded that, with the procedures used to delimit the experimental plots in this experiment to water the soil profile and to follow the water redistribuition, the unit gradient approches seem to be adequate to assess the field ( ) q K function and also that the pedological horizons seem to follow the layers of similar ( ) q K function, for depths greater than 0.6 m.
ASSUNTO(S)
física do solo soil water content relação solo-água soil physics soil-water relation soil hydraulic conductivity condutividade hidráulica do solo umidade do solo
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