Uptake of terbuthylazine and its medium polar metabolites into maize plants |
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Authors: | Sebastian Gayler Stefan Trapp Michael Matthies Reiner Schroll Herwart Behrendt |
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Institution: | 1. Institute of Environmental Systems Research, University of Osnabrück, D-49069, Osnabrück, Germany 2. GSF-Forschungszentrum für Umwelt und Gesundheit mbH, Ingolst?dter Landstr. 1, D-85764, OberschleisBheim, Germany
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Abstract: | The uptake of terbuthylazine and its medium polar metabolites into maize plants under outdoor conditions is investigated.
For this purpose, a dynamical fate model consisting of soil, plant and air is developed. The model calculations are compared
with experimental results of outdoor lysimeter tests, carried out with14C-labelled herbicide applied to sandy agricultural soil at a single application rate of 890 g/ha. Approximately 0.3 % of the
applied activity remains in all the plants after the vegetation period. The model predicts that about three times that amount
is volatilized from the plants into the air. Activity uptaken from soil and volatilized from plant surface into air is predominately
associated with metabolites. During the whole vegetation period the fraction of unchanged terbuthylazine in the plants is
very small (less than 1 % of the extractable activity). |
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