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    Aeration conditions of a clayey oxisol under long-term no-tillage

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    10669.pdf (182.2Kb)
    Date
    2014
    Author
    Betioli E Jnr
    Tormena CA
    Moreira WH
    Ball BC
    Figueiredo GC
    da Silva AP
    Giarola NFB
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    Abstract
    The hypothesis of this study was that the absence of soil tillage in long-term no-tillage (NT) systems can be detrimental to soil aeration. The objective was to assess the aeration condition of an Oxisol (Rhodic Ferrasol), very clayey texture (750 g kg-1 of clay; 200 g kg-1 of sand), after 30 years of cultivation under NT. The physical property soil air permeability (Ka) is sensitive to changes in the soil pore system. Aside from Ka, the air-filled porosity (!a) and indices of pore continuity (K1 and N), derived from the relationship between Ka and !a, were used as indices of soil aeration. From the soil layers 0.0-0.1 and 0.1-0.2 m, 240 undisturbed samples were collected along a transect perpendicular to the crop rows, at three sampling positions: corn plant row (CR); center of the interrow (INT); and the equidistant point between CR and INT (PE). The properties Ka and !a were determined at soil matric potentials (Ym) of -2, -4, -6, -10, -30, and -50 kPa. Soil bulk density (BD) was also determined. The results confirmed the hypothesis. In the 0.0-0.1 m layer, Ka, K1, N and !a were significantly greater and BD significantly lower in CR than at the other sampling positions. At a Ym of -10 kPa, the Ka of CR was 6.9 and 8.4 times higher than in PE and INT, respectively, in the 0.0-0.1 m layer. The properties Ka, K1 and N were sensitive enough to detect changes in the pore system and their differences between the sampling positions demonstrated the importance of the spatial location for soil sampling. Tilling the crop rows provides better soil aeration under NT.
    Journal Title/Title of Proceedings
    Revista Brasileira de Ciencia do Solo
    Rights
    This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
    Version
    Publisher PDF
    Volume/Issue Number
    38:3
    Page Numbers
    990‐999
    URI
    http://dx.doi.org/10.1590/S0100-06832014000300031
    http://hdl.handle.net/11262/10669
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