Resumo

CASTIGLION, Mario Guillermo; BEHRENDS KRAEMER, Filipe  e  MARQUEZ MOLINA, John Jairo. Saturated hydraulic conductivity determined with different procedures in soils with high soil water content. Cienc. suelo [online]. 2018, vol.36, n.2, pp.158-169. ISSN 1850-2067.

Saturated hydraulic conductivity (Ks) has a strong influence on the partition of the rain in infiltration and runoff. A correct value of this property is important to estimate in a real way the hydrological and erosion processes. The aim of the present work was: To compare the results of Ks obtained in soils under agriculture with high initial water content and located in two different positions of the landscape, determined by different field and laboratory procedures, analyzing in turn the incidence of other soil physical properties over these results. In two successive years, the Ks was determined by different field techniques (double ring, rain simulator, Guelph and disk permeameter) and a laboratory practice, on an Argiudol of Rolling Pampa under no tillage. The results of Ks generated by the different procedures were compared, as well as if there was some link between them and with other soil physical properties. The Ks variability was also studied. The soil presented high initial water content and a poor physical condition. The initial water content only influenced the results of Ks obtained with the double ring and with the rain simulator, while bulk density affected those generated with Guelph permeameter and by the laboratory technique. The differences found in Ks determined by the several techniques were linked to the dominant flow type: vertical (double ring and rain simulator), three-dimensional (Guelph and disk permeameter) and free in the lower part of the soil (laboratory), increasing in the same order the value of Ks observed.

Palavras-chave : infiltration; physical properties; variability.

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