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Pesquisa Agropecuária Brasileira

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

Abstract

CARVALHO, Juliana dos Santos et al. Evolution of physical, chemical, and biological attributes of hydromorphic soil under crop-livestock integration systems in the Pampa biome. Pesq. agropec. bras. [online]. 2016, vol.51, n.9, pp.1131-1139. ISSN 0100-204X.  https://doi.org/10.1590/s0100-204x2016000900012.

The objective of this work was to evaluate the evolution of physical, chemical, and biological attributes of a hydromorphic soil, in crop-livestock integration systems in the Pampa biome. The study was carried out in an experimental area under no-tillage system since 2006, in the municipality of Capão do Leão, in the state of Rio Grande do Sul, Brazil, in a Haplic Albaqualf. Three areas were used with the following management types: an area without grazing; a grazing area under crop-livestock integration (CLI), with soybean or corn in alternating years, in succession to winter grazing; and a native grazed field. Soil samplings were conducted in two seasons in all areas, at the 0.00-0.05, 0.05-0.10, and 0.10-0.20-m soil layers, in order to carry out the following soil analyses: physical attributes, macroporosity, microporosity and density; chemical attributes, total organic carbon, total nitrogen, and carbon/nitrogen ratio; biological attributes, diversity and abundance of edaphic macrofauna. In the grazinf area, macroporosity increase over the time. There was a reduction in soil bulk density at the 0.00-0.05-m soil depth, whereas total organic carbon increased in the 0.10-0.20-m soil depth, in all areas. The crop-livestock integration system benefits the abundance and diversity of the edaphic fauna in the soil.

Keywords : floodplain; edaphic fauna; Haplic Albaqualf; no-tillage; soil quality; lowlands.

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