Resumo

MADRIGAL, Ismael et al. Pesticide degradation in vegetative buffer strips: grassed and tree barriers: case of isoproturon. Agrociencia [online]. 2007, vol.41, n.2, pp.205-217. ISSN 2521-9766.

The installation of vegetative buffer strips is one of the solutions proposed to combat pesticide pollution of surface water. These zones are effective in removing pesticides transported by runoff, but there is little information on what happens to the intercepted molecules. In this study, degradation of the herbicide isoproturon (IPU) [3-(4-isopropylphenyl)-1, 1-dimethylurea] in soils from grassed strip, treed zones, and farm plots at the ARVALIS experimental site in La Jaillière, France was assessed. The degradation experiments were conducted in laboratory using isoproturon marked with 14C in the benzene ring. Mineralization of IPU was especially important in the surface horizons of the soils from grassed strip and the treed zone. The formation of non-extractable, or low available residues was particularly important in the horizons where degradation is more active. Thus, the stabilization of isoproturon residues is highest in the topsoil horizons of the buffer strips. The rapid dissipation of IPU in the soils of the buffer zones indicates an interesting de-polluting function compared with agricultural soil since degradation and mineralization of IPU increase in the buffer zone soils. However, the weak degrading potential of the 30-60 cm horizons indicates that the effectiveness of these systems via degradation and stabilization processes of the products of interest is much more important in the topsoil horizons.

Palavras-chave : Water; pollution; organic matter; phytosanitary products; vegetation buffer strips.

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