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Pesquisa Agropecuária Brasileira

versão impressa ISSN 0100-204Xversão On-line ISSN 1678-3921

Resumo

FERRI, Miguel Vicente Weiss et al. Activity of the herbicide acetochlor in soil under no-till and conventional tillage systems. Pesq. agropec. bras. [online]. 2002, vol.37, n.12, pp.1697-1703. ISSN 0100-204X.  http://dx.doi.org/10.1590/S0100-204X2002001200004.

The activity of herbicide acetochlor in a Red Argisol (Paleudult) under no-till and conventional tillage systems was investigated in laboratory and field experiments. The herbicide was less efficient on weed control under no-till system than under conventional tillage. The reduction of wheat dry matter, evaluated in the sample collected from the 16-19 cm depth, was higher under no-till, suggesting a greater leaching capacity in this soil tillage system. The acetochlor sorption was higher on no-till system than in the conventional tillage, as indicated by the distribution coefficients on soil (Kd): 2.75 and 1.67 L kg-1, respectively. The distribution coefficients relative to the soil organic carbon (Koc) were 166 L kg-1 on no-till and 126 L kg-1 on conventional tillage, showing that the herbicide was sorbed in a greater extent by the organic matter from the no-till system.

Palavras-chave : weeds; soil management; sorption; leaching.

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