Table of Contents
ISRN Ecology
Volume 2012, Article ID 329898, 9 pages
http://dx.doi.org/10.5402/2012/329898
Research Article

Impact of Maize Formulated Herbicides Mesotrione and S-Metolachlor, Applied Alone and in Mixture, on Soil Microbial Communities.

1LMGE, Clermont Université, Université Blaise Pascal, 63000 Clermont-Ferrand, France
2UMR 6023, CNRS, and Laboratoire Microorganismes : Génome et Environnement, Université Blaise Pascal, 63177 Aubière, France
3SEESIB, Clermont Université, Université Blaise Pascal, 63000 Clermont-Ferrand, France
4UMR 6504, CNRS, and Laboratoire de Synthèse et Etude de Systèmes à Intérêt Biologique, 63177 Aubière, France

Received 19 September 2011; Accepted 14 November 2011

Academic Editors: G. Berg and D. C. Moon

Copyright © 2012 Pierre Joly et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In order to reduce the amounts of pesticides used, and thereby their associated risks, new generations of less environmentally dangerous molecules with lower weight are currently being used in the mixtures sprayed on crops. Few studies have been made, however, to analyse their impact on the soil, and more particularly on the microorganisms living in the soil which maintain the essential functions of this ecosystem. By taking a microcosmic approach, we were able to assess the impact of the maize herbicides “cocktail” Mesotrione and S-metolachlor on global soil microbial activity, biomass, and structures, by using the formulated compounds, respectively, Callisto and Dual Gold (both registered brands of Syngenta). Our results highlighted a synergetic effect in “cocktail” microcosms resulting in an increase in the Mesotrione herbicide dissipation time and in an impact on the microbial community at onefold field rate equally to more than a single herbicide used at tenfold field rate.