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Modelling the Environmental Fate of the Herbicide Glyphosate in Soil Lysimeters

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Water, Air, & Soil Pollution: Focus

Abstract

In a risk assessment study the environmental fate of the herbicide glyphosate was studied with the specific background of the presence of genetically modified (GM) plants. Aim was to simulate the environmental behaviour of glyphosate in sandy field soil lysimeters after multiple herbicide applications and under the presence of GM soybean and to test and enhance model reliability in the simulation of the herbicide fate including biodegradation in the soil and herbicide translocation in GM plants. The modelling of the herbicide behaviour in the present study was based on the pesticide transport model LEACHP and the model PLANTX to simulate the pesticide uptake by plants. Both models were implemented in the modular modelling system EXPERT-N. Glyphosate transport measurements and the mathematical modelling results indicate that due to the high sorption of glyphosate to the soil matrix and the high microbial capacities for glyphosate degradation in the lysimeter soil, leaching risk can be considered to be low. We confirmed that the introduction of more adequate conceptual descriptions of microbial response to pesticide and nutrient additions can contribute to a reduction in the uncertainty of pesticide degradation modelling. Moreover, the consideration of uncertainty in sorption, dispersivity and degradation parameters revealed a considerable variability in model output. The observed accumulation of glyphosate in roots and nodules was reproduced by the simulation results. Under the restriction that the prevailing model assumptions are valid, the simulation results indicate that glyphosate may accumulate also in beans of trangenic soybean.

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Acknowledgements

For technical and experimental support with the tracer measurement we thank W. Stichler. The authors are grateful to Monsanto Europe for providing the transgenic soybean seeds.

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  1. Institute of Soil Ecology, GSF – National Research Center for Environment and Health, Ingolstädter Landstrasse 1, 85764, Neuherberg, Germany

    Christine Klier, Sabine Grundmann, Sebastian Gayler & Eckart Priesack

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  1. Christine Klier
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  2. Sabine Grundmann
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  3. Sebastian Gayler
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Correspondence to Christine Klier.

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Klier, C., Grundmann, S., Gayler, S. et al. Modelling the Environmental Fate of the Herbicide Glyphosate in Soil Lysimeters. Water Air Soil Pollut: Focus 8, 187–207 (2008). https://doi.org/10.1007/s11267-007-9171-5

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  • DOI: https://doi.org/10.1007/s11267-007-9171-5

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