Resumen

IMHOFF, Silvia et al. Efluentes líquidos de tambo: efectos de su aplicación sobre las propiedades físicas de un argiudol. Cienc. suelo [online]. 2014, vol.32, n.2, pp.177-187. ISSN 1850-2067.

The application of dairy cattle slurry (DCS) to the soil is a practice that is spreading quickly in the milkmaid basin of Santa Fe. The objective of this study was to evaluate the effect of adding several rates of DCS on the soil physical properties. The experiment was carried out on a Typic Argiudoll and consisted of three treatments with three replications randomly distributed :control, without DCS (T0), application of 80 m³ ha^-1 (T80) and 160 m³ ha^-1 (T160) of DCS. The DCS was spread before seeding ryegrass and sorghum. Measurements were performed before grazing the ryegrass (M1) and before harvesting the sorghum (M2). Undisturbed soil samples (cylinders) were collected to determine soil bulk density (Bd), pore size distribution, least limiting water range (LLWR) and soil critical bulk density (Bdc). Undisturbed soil samples were also collected with a shovel to evaluate the size aggregates distribution and the mean geometric diameter (MGD). Water infiltration and hydraulic conductivity were measured with tension infiltrometers. Treatments M1, T80 and T160 showed higher water infiltration and conduction through bio and macropores. The size aggregates distribution and the MGD did not show significant differences among treatments. In M2, a Bd decrease and a macroporosity increase was observed, mainly in T160. The three treatments showed similar Bdc, but with a different range of variation of Bd and percentage of cases registered outside of the LLWR. The evaluated indicators showed different sensitivity to identify alterations in soil structure induced by the application of DCS. The soil-crop-weather interaction notably influenced the changes of the soil physical properties. Therefore, it is necessary to carry out long-term studies to corroborate these results.

Palabras clave : Water conductivity, aggregates distribution, soil bulk density, least limiting water range.

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