Abstract

DOUIBI, Marwa et al. Conservation Agriculture: Impact on the Dissipation of Herbicides. Rev. de Ciências Agrárias [online]. 2022, vol.45, n.4, pp.731-740.  Epub Dec 01, 2022. ISSN 0871-018X.  https://doi.org/10.19084/rca.28607.

The accumulation of crop residues on the soil surface (mulch) and no-tillage of the soil represent a current agricultural practice for soil conservation that can modify the dissipation of herbicides applied in these agricultural systems. The objective of this work was to study at field scale: i) the dissipation of the herbicides S-metolachlor (SMOC), foramsulfuron (FORAM) and thiencarbazone-methyl (TIEN), ii) the formation of metabolites, and iii) the soil dehydrogenase activity (DHA) under traditional (LT) and conservation (NL) tillage practices in an agricultural soil with two different surface organic carbon (CO) contents (S1 and S2). Herbicide dissipation was faster in NL than in LT soils, taking place mainly on the mulch surface. The half-lives (DT50) under the different treatments varied between 1.7-30.2 (SMOC), 3.7-8.8 (FORAM) and 5.2-25.2 (TIEN) days. The lower amount of metabolites observed in the soils under NL agreed with the lower amount of herbicides that reached the soil surface as a result of their partial interception by the mulch. Soil DHA was higher in soils untreated with herbicide and under NL.

Keywords : dissipation; herbicide; soil; conservation agriculture; field.

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