Soil solution ion movement in plots under crop-pasture rotations / Movimento de íons em solo sob sistema de integração lavoura-pecuária na região de cerrados

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The objective of this study was to evaluate the soil solution ion concentrations and vertical flux in experimental plots under the following systems: continuous crop, continuous pasture and crop-pasture rotations. The experiment was started in 1991, but the soil solution was collected during the years of 2005 and 2006. Porous capsules were installed in two soil depths, 20 and 150 cm, and samples of solution were extracted in six dates for each year. The concentration of the following ions was measured: Cl-, SO42-, NO3-, H2PO4-, K+, Mg2+ e Ca2+. In order to estimate the vertical flux of ions in the soil profile it was adopted the SAARA Model (System of Regional Analysis of Agroclimatic Risks) In general terms, the pattern of anions movement was: NO3- >>Cl- >SO42- >H2PO4-, and of cations was: Ca2+ >K+ >Mg2+. When cropping systems were compared, the general pattern of ion movement was: continuous cropping >crop-pasture rotations >continuous pasture. Considering leaching potential, the main concern is with nitrate ion in soil under continuous cropping.

ASSUNTO(S)

cerrado pasture pastagem soil solution solução do solo lixiviação cerrado crop rotation sistemas de cultivo ciencias agrarias leaching

ACESSO AO ARTIGO

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