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Pesquisa Agropecuária Brasileira

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

Abstract

ALMEIDA, Wilk Sampaio de et al. Hydraulic erosion in different tillage systems and soil cover. Pesq. agropec. bras. [online]. 2016, vol.51, n.9, pp.1110-1119. ISSN 0100-204X.  https://doi.org/10.1590/s0100-204x2016000900010.

The objective of this work was to evaluate, under simulated rainfall, the effect of soil cover on the erosion of a Typic Hapludalf erosion, in the state of Mato Grosso do Sul, Brazil, in the following crop systems: soybean, under conventional tillage; soybean, under no-tillage; established pasture, without cattle trampling; and exposed soil, as a comparison standard. Digital photographs were taken every 20 days for soil cover estimate, and 60 mm h-1 simulated rainfall was applied on the experimental plots, using a portable sprinkler infiltrometer. Soil losses, quantified every 2 min, ranged from 3.10 to 11.40 Mg ha-1, in exposed soil, and from 0.03 to 0.19 Mg ha-1, in established pasture; water losses ranged from 300 to 555 m3 ha-1, in exposed soil, and from 63 to 229 m3 ha-1, in soybean cultivation under no-tillage. Soil losses decreased with the increase in vegetation cover. In the pasture, the maximum vegetation cover was 98.10%. Conventional tillage has temporary positive effects, which makes the soil more susceptible to erosion than the conservationist systems.

Keywords : Glycine max; Urochloa ruziziensis; soil and water losses; simulated rainfall.

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