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The Ecotoxicity of Sugarcane Pesticides to Non-target Soil Organisms as a Function of Soil Properties and Moisture Conditions

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Abstract

To attend the increasing demand for food and energy, vast monocultures such as sugarcane, soy, and corn, often adopts routinely intensive application of pesticides and chemical fertilizers, disregarding their potential effects on non-target soil organisms, which are crucial for soil functioning. In this study, we present the assessment of toxic effects of the commercial herbicide DMA® 806 BR (active ingredient: 2,4-D) and of the insecticide Regent® 800 WG (active ingredient: fipronil) to the non-target terrestrial plant Raphanus sativus var. acanthioformis (dicotyledon) and to the collembolan species Folsomia candida, in combination with different soil moisture conditions in natural and artificial tropical soils. Plant growth and biomass were severely affected by the presence of DMA alone, with significant differences from the control treatment already detected at 0.13 mg/kg/dw. Upon low soil moisture (20%, 40%, 60% WHC), the toxicity of DMA to plants was diminished, exhibiting an antagonistic pattern of interaction between DMA and soil moisture. Soil composition had a significant influence on survival and reproduction of collembola especially at high soil moisture content. In the natural soil, 80% of the water holding  capacity (WHC) induced 100% collembola mortality whereas, in the tropical artificial soil (TAS), this same moisture condition had a negligible effect on survival. Reproduction was mainly affected by fipronil under drought conditions (20% WHC) at both soil types, possibly correlated with increased concentration of fipronil in the soil pore water at such conditions. Results herein presented highlight the requisite of including abiotic fluctuations in hazard assessment of pesticides to preserve soil function provided by biota.

Highlights

  • Soil moisture contribute on determining 2,4-D toxicity to terrestrial plants.

  • Soil moisture contribute on determining fipronil toxicity to Folsomia candida.

  • High-moisture levels increased plant species sensitivity to the herbicide 2,4-D.

  • Soil properties influences collembola sensitivity to pesticide contamination.

  • Dry conditions (20% WHC) + fipronil (1/8 RD) decrease F. candida

  • reproduction in 70%.

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Availability of Data and Materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

Thanks are due to Dr. Luiz Antonio Martinelli, Dr. Janaina Braga do Carmo and Dr. Leonardo Machado Pitombo for their technical contribution to the measurement of the physical-chemical parameters of the natural soil used. The authors also thank the Brazilian coordination of Superior Level Staff Improvement (CAPES) for the master’s degree scholarship conceded and the São Paulo Research Foundation (FAPESP) for the financial support conceded via the thematic project “Environmental Effects of the Pasture-Sugarcane Conversion and Pasture Intensification” (Process: 2015/187903) and the post-doctoral grant (Process PDJ: 2017/04858-0).

Funding

This work was supported by the Brazilian coordination of Superior Level Staff Improvement (CAPES) through a master degree scholarship attributed to Maria Carolina Triques and by the São Paulo Research Foundation (FAPESP) through financial support conceded via the thematic project “Environmental Effects of the Pasture-Sugarcane Conversion and Pasture Intensification” (Process: 2015/187903) and through post-doctoral grant conceded to Vanessa Bezerra de Menezes-Oliveira (Process PDJ: 2017/04858–0).

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Contributions

MCT conceptualization, methodology, formal analysis, investigation, and writing (Original draft); FR investigation, formal analysis, writing and editing, (Original draft); DO conceptualization, methodology, formal analysis, and investigation; BVGt methodology and investigation; CCM article investigation and resources; ELGE investigation, resources, and supervision; VB de M-O article conceptualization, methodology, formal analysis, investigation, writing (Original draft and review), resources and supervision.

Corresponding author

Correspondence to Vanessa Bezerra de Menezes-Oliveira.

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Competing Interests

The authors have no relevant financial or non-financial interests to disclose.

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Triques, M.C., Ribeiro, F., de Oliveira, D. et al. The Ecotoxicity of Sugarcane Pesticides to Non-target Soil Organisms as a Function of Soil Properties and Moisture Conditions. Int J Environ Res 16, 61 (2022). https://doi.org/10.1007/s41742-022-00433-6

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  • DOI: https://doi.org/10.1007/s41742-022-00433-6

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