Contribution of macroporosity to water flux of a soil under different tillage systems

 

Autores
Soracco, Carlos Germán; Lozano, Luis Alberto; Balbuena, Roberto; Ressia, Juan Manuel; Filgueira, Roberto Raul
Tipo de recurso
artículo
Estado
Versión publicada
Año de publicación
2012
País
Argentina
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio
CONICET Digital (CONICET)
Descripción
In view of the importance of the macroporosity for the water transport properties of soils, its quantitative assessment is a challenging task. Measurements of hydraulic conductivity (K) at different soil water tensions and the quantification of water-conducting macropores (θM) of a soil under different tillage systems could help understand the effects on the soil porous system and related hydraulic properties. The purpose of this study was to assess the effects of Conventional Tillage (CT), Chisel Plow (CP) and No Tillage (NT) on θM and on K; and to quantify the contribution of macroporosity to total water flux in a loam soil. A tension disc infiltrometer was used at two soil water pressure heads (-5 cm, and 0) to infer θM and K, during fallow. Macroporosity was determined based on the flow contribution between 0 and -5 cm water potentials (K0, K5, respectively), according to the Hagen-Poiseuille equation. The K0 values were statistically higher for CT than for NT and CP. The K5 values did not differ statistically among treatments. The mean K values varied between 0.20 and 3.70 cm/h. For CT, θM was significantly greater than for CP and NT, following the same trend as K0. No differences in θM were detected between CP and NT. With CT, the formation of water-conducting macropores with persistence until post-harvest was possible, while under CP preparation, the water-conducting macropores were not persistent. These results support the idea that tillage affects the soil water movement mainly by the resulting water-conducting macropores. Future studies on tillage effects on water movement should focus on macroporosity.
Idioma
inglés
OAI Identifier
oai:ri.conicet.gov.ar:11336/11132
Enlace del recurso
http://hdl.handle.net/11336/11132
Nivel de acceso
Acceso abierto
Materia
Tension disc infiltrometer
No tillage
Chisel plough
Effective porosity
Otras Ciencias Agrícolas
Otras Ciencias Agrícolas
CIENCIAS AGRÍCOLAS