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Water, Air, & Soil Pollution

, 226:21 | Cite as

The Effects of Glyphosate and Atrazine Mixture on Soil Microbial Population and Subsequent Impacts on Their Fate in a Tropical Soil

  • Eloana Janice BonfleurEmail author
  • Valdemar Luiz Tornisielo
  • Jussara Borges Regitano
  • Arquimedes Lavorenti
Article

Abstract

Glyphosate applied in association with atrazine provides the best cost/benefit for weed control for genetically modified corn. Therefore, the aim of this work was to evaluate the effects of applying glyphosate in mixture with atrazine on soil microbial population and on herbicides fate in a representative Oxisol from Brazil. The treatments consisted in applying the recommended field rate of glyphosate in association with 0, 1, and 2 times the recommended field rate of atrazine (and vice versa), plus the control (without herbicides application). The presence of atrazine temporarily (21 days) decreased soil microbial biomass (SMB) and increased soil carbon mineralization (SCmin, up to 13 times) and microbial metabolic quotient (qCO2) due to the stresses caused by its toxicity. When the mixture was applied independent of the rates, SMB was recovered and the amounts of extractable and non-extractable 14C-residues were the same for both herbicides at 63 days. These results suggest that glyphosate may mitigate atrazine’s temporary impact on soil microbes by supplying them nutrients during their adaptation.

Keywords

Herbicides association Soil microbial population Environmental impact Pesticide mineralization 

Notes

Acknowledgments

The authors thank the College of Agriculture “Luiz de Queiroz” (ESALQ/USP), the Center of Nuclear Energy in Agriculture (CENA/USP), and the Brazilian Agricultural Research Corporation (CNPGC/EMBRAPA) for providing the facilities to develop the study and to the National Council for Higher Education Improvement (CAPES) for the financial support.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Eloana Janice Bonfleur
    • 1
    Email author
  • Valdemar Luiz Tornisielo
    • 2
  • Jussara Borges Regitano
    • 1
  • Arquimedes Lavorenti
    • 3
  1. 1.Luiz de Queiroz College of Agricuture (ESALQ), Soil Science DepartmentUniversity of São Paulo (USP)PiracicabaBrazil
  2. 2.Center of nuclear energy in agriculture (CENA), Ecotoxicology LaboratoryUniversity of São Paulo (USP)PiracicabaBrazil
  3. 3.Luiz de Queiroz College of Agricuture (ESALQ), Exact Science DepartmentUniversity of São Paulo (USP)PiracicabaBrazil

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