Gorana Todorovic Rampazzo, Axel Mentler, Nicola Rampazzo, Winfried E.H. Blum, Alexander Eder, Peter Strauss


Different physical, chemical and biological processes influence the behaviour of organic contaminants in soils. A better understanding of the organic pollutant behaviour in soils would improve the environmental protection. One possible way for better attenuation of the risk of pollution in agriculture can be achieved through ta better-specified pesticide management based on the adaptation of the pesticide type and application rates to the specific environmental characteristics of the area of application. Nowadays, one of the actually most applied herbicide world wide is glyphosate. Glyphosate is highly water soluble and traces have been found in surface and groundwater systems. For a better understanding of the natural influence of erosion processes on glyphosate behaviour and dispersion under heavy rain conditions after application in the field, two erosion simulation experiments were conducted on two different locations in Austria with completely different soil types in September 2008. The results of the experiments showed that under normal practical conditions (e.g. no rainfall is expected immediatly after application), the potential adsorption capacity of the Kirchberg soil (Stagnic Cambisol, with about 16.000 ppm Fe-oxides) is confirmed compared to the low adsorption Chernosem soil (about 8.000 ppm pedogenic Fe-oxides).  Considering the enormous difference in the run-off amounts between the two sites Pixendorf and Kirchberg soils it can be concluded how important the soil structural conditions and vegetation type and cover are for the risks of erosion and, as a consequence, pollution of neighbouring waters. In the rainfall experiments under comparable simulation conditions, the amount of run-off was about 10 times higher at Kirchberg, owing to its better infiltration rate, than at the Pixendorf site. Moreover, the total loss of glyphosate (NT+CT) through run-off at the Kirchberg site was more than double that at Pixendorf, which confirms the importance of the chemical and mineralogical nature of soils in the abatement and absorbency of glyphosate, and the poor results in case of erosive precipitations whwn soil structure and permeability are not favourable.


Glyphosate; erosion; soil tillage; environment

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DOI: 10.6092/issn.2281-4485/3800


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