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Pesquisa Agropecuária Brasileira

Print version ISSN 0100-204XOn-line version ISSN 1678-3921

Abstract

REIS, Diony Alves; LIMA, Claúdia Liane Rodrigues de  and  BAMBERG, Adilson Luís. Physical quality and organic matter fractions of an Alfisol under no-tillage. Pesq. agropec. bras. [online]. 2016, vol.51, n.9, pp.1623-1632. ISSN 1678-3921.  https://doi.org/10.1590/s0100-204x2016000900062.

The objective of this work was to evaluate the physical quality and the organic matter fractions of an Alfisol soil under no-tillage (NT) with different deployment times in Southern Brazil. Soil samples were taken at the 0.00-0.03, 0.03-0.06, 0.06-0.10, and 0.10-0.20-m depths, for determining: total porosity (Pt); macroporosity (Ma); microporosity (Mi); soil penetration resistance (Rp); bulk density (Ds); macro- and microaggregates; mean weight diameter (MWD) of soil aggregates; total organic carbon content (TOC); the free light (FLL), light occluded (FLO), and heavy (FP) carbon fractions; carbon stocks (EstC); and the lability (ILC), stock (IEC), and carbon management (IMC) indexes. SPD deployment time increased Pt, Ma, and EstC, and decreased Mi, RP, Ds. NT promotes MWD, ILC, IEC, and IMC after five years of deployment, and, therefore, it improves soil physical quality.

Keywords : organic matter dynamics; soil structuration; organic matter fractioning; lability indexes; hydromorphic soil; lowland soils.

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