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Pesquisa Agropecuária Brasileira

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

Abstract

ALMEIDA, Denice de Oliveira; BAYER, Cimelio  and  ALMEIDA, Henrique Cesar. Fauna and microbial attributes of an Ultisol under cover crop systems in the South of Brazil. Pesq. agropec. bras. [online]. 2016, vol.51, n.9, pp.1140-1147. ISSN 0100-204X.  https://doi.org/10.1590/s0100-204x2016000900013.

The objective of this work was to evaluate, in a long-term experiment, the fauna and microbiological attributes of an Ultisol under no-tillage cover crop. The study was carried out in Eldorado do Sul, RS, Brazil, after 27 years of implantation of an experiment evaluating the following crop systems: O/C, oat/corn; V/C, vetch/corn; OV/C, oat + vetch/corn; OV/CP, oat + vetch/corn + cowpea; and L/M, lablab/corn. A randomized complete block design was used, with three replicates. Samplings of fauna, performed with pitfalls, and of microbiological attributes were done after cover crop management, in spring; during corn crop cycle, in summer; after corn crop harvest, in autumn; and during cover crop cycle, in winter. The inclusion of legume intercropped or in succession to cover crops promoted the occurrence of edaphic fauna and increased microbial biomass C and N, which favored cycling potential and nutrient availability. The O/C cover crop system with grasses favored the Diptera, Hemiptera, and Diplopoda orders. Overall, the best cover crop systems under no-tillage are those with legume inclusion.

Keywords : bioindicators; microbial biomass; cover crop intercropping; edaphic organisms; no-tillage; soil quality.

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