Comparison of glyphosate persistence in clay soil on no-tilled and autumn ploughed plots

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Title: Comparison of glyphosate persistence in clay soil on no-tilled and autumn ploughed plots
Author: Petruneva, Ekaterina
Contributor: University of Helsinki, Faculty of Agriculture and Forestry, Department of Agricultural Sciences
Publisher: Helsingin yliopisto
Date: 2015
Thesis level: Master's thesis
Abstract: The present work was based on the analysis of glyphosate concentrations in six soil layers after continuous multiple applications of herbicide products and various sampling times during the study period of 2010?2012, and aimed to contribute to a better recognition of the glyphosate persistence in clay soil. Two tillage methods (conventional tillage and no-till) were carried out in two replicates on the experimental field located in Jokioinen, South-Western Finland. This experiment was important for the identification of glyphosate amounts in soil profile and for planning a better field management in the future on the larger scale. Results of the study demonstrated that glyphosate and its metabolite AMPA remained on the field a year after the spraying of the herbicide. Calculated reference degradation rate constants and half-lives were proved to be in a range with literature review. While the impact of tillage methods on the glyphosate retention in soil was not possible to assess by the present study due to the quite sparse nature of the data, the residuals of glyphosate and AMPA at deep layers were almost non-detectable. Study clearly showed that accumulation of glyphosate happens mostly in topsoil, and the leaching potential into deeper layers was quite limited.
Subject: Glyphosate
degradation rate constant
persistence of herbicides
Discipline: Agroteknologi (lantbruks- och miljöteknologi)
Agrotechnology (Agricultural and Environmental Engineering)
Agroteknologia (maatalous- ja ympäristöteknologia)

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