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handle: 10261/156956
[ES] El laboreo tiene una influencia directa sobre las propiedades hidrofísicas del suelo. Este trabajo evalúa el efecto del laboreo sobre la densidad aparente (ρb), los parámetros de van Genuchten de la curva de retención (α y n), la sorptividad (S) y la conductividad hidráulica (K). Se compararon tres sistemas de laboreo: vertedera (CT), chísel (RT) y no-laboreo (NT). Las medidas se realizaron a lo largo de un período de barbecho de 18 meses. En condiciones estructuradas, NT presentó valores más altos de ρb y n, y valores más bajos de α, K y S. Tras labores primarias se observó un aumento de α, S y K. Las primeras precipitaciones efectivas post-laboreo, responsables de la formación de la corteza superficial, promovieron que los parámetros hidráulicos medidos tendieran a recuperar sus valores pre-laboreo, es decir, se observó un aumento de ρb y n y una disminución de α, S y K.
[EN] Tillage practices have a significant influence on the soil hydro-physical properties. This work evaluates the effect of tillage on the soil bulk density (ρb), the van Genuchten (1980) water retention parameters (α y n), saturated sorptivity (S) and hydraulic conductivity (K). Three different tillage systems were compared: conventional (CT) reduced (RT) and no-tillage (NT) systems. Measures were performed along an 18 month long fallow period. Under structured conditions, NT presented the highest values of ρb and n, and the lowest values of α, K and S. Loosening of soil due to primary tillage practices increased α, S and K. These parameters tended to recover their pre-tillage values after post-tillage copious rainfalls; which were also responsible of the surface crust formation. After the post-secondary tillage rainfalls, ρb and n increased and α, S and K decreased.
6 Pags.- 4 Figs. El contenido es de exclusiva responsabilidad de los autores. Creative Commons License Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
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