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Bragantia

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Abstract

SCHIAVO, Jolimar Antonio  and  COLODRO, Gilberto. Aggregation and penetration resistance of an Oxisol under livestock-crop integration system. Bragantia [online]. 2012, vol.71, n.3, pp. 406-412.  Epub Nov 06, 2012. ISSN 0006-8705.  http://dx.doi.org/10.1590/S0006-87052012005000035.

The aim of this study was to evaluate changes in soil physical properties, specifically regarding soil aggregation and resistance to penetration, as well as total organic carbon (TOC) of an Oxisol subjected to an integrated crop-livestock system with the following coverage: corn, pasture, Tanzania grass and Savannah. Soil cultivated with Tanzania grass showed the lowest percentage of total porosity (49%), highest density of soil (Ds) in the surface layer of 0-5 cm (1.60 g kg-1), and similar to the soil cultivated with pasture, presented lower percentages of macropores (6.6 to 9.4%) and higher values of soil penetration resistance at field capacity (1.3 to 4.08 MPa). At the three depths, the TOC levels were highest in Savannah soil; and among the cultivated areas at the depth of 5-10 cm, the highest levels were observed in areas with corn (20.15 g kg-1) and pasture (23.15 g kg-1). Areas with corn and pasture showed the highest percentage of large aggregates (>4 mm), similar to the Savannah that presented the highest weighted average diameter of aggregates (WAD). A positive correlation was observed between TOC and WAD of the aggregates (r=0.45), WAD and total soil porosity (r=0.76) and a negative correlation between TOC and Ds (r=-0.56).

Keywords : soil physical properties; no-tillage; soil physical quality; soil management.

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