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Field trails on weed control in genetically modified glufosinate resistant sugar beet under ploughing and reduced tillage conditions

Summary
The complete article is written in German
In a field experiment from 1995 to 2001, options of weed control in genetically modified, glufosinate resistant (Liberty Link®) sugar beets have been evaluated. These sugar beets were cultivated under conventional (PF) and conservative tillage methods (MU). The field trail show that by using herbicide resistant sugar beets; it was possible to reduce the frequency of treatments with herbicides as well as the amount of herbicide used.
In the years 1996, 1997, 1999 and 2001 the field trials were destroyed by unknown persons. Despite that fact, it was possible to come to statements concerning the use of the herbicide resistant technology (HR Technology). Through the opportunity of a later herbicide use the integrated weed control in the sugar beet cultivation can be developed further. The control of weeds requires a very early herbicide application, since the authorized products only achieve a satisfying efficacy, if the weeds are still in the cotyledonous and first leaf stages. Therefore, under current practical conditions, a consequent and integrated weed management based on threshold levels cannot be realised. This concept applies weed control only in critical periods of sugar beet growth.
The experiment showed that the effect of Liberty 18 SL (Glufosinate 183g/l) on important arable weeds allows a later application. This could be the basis for further enhancements of weed control systems in the sugar beet cultivation and enables the sugar beet grower to conduct a more targeted weed control. Weeds mostly affect sugar beets at a later stage of development.
Through the cultivation of genetically modified, herbicide resistant sugar beets, it was possible to reduce the frequency of herbicide applications as far as to one application. The application of the soil sparing conservative cultivation method in sugar beet cultivation can be facilitated by the use of the HR-Technology. Thus, it could be possible to reduce pre-emergence treatments with herbicides.
Furthermore, the trials showed that a more flexible weed management is possible through the combination of herbicide resistant sugar beets with the herbicide Liberty 18 SL. That enables the sugar beet grower to conduct the herbicide application at a time. Thereby, soil structure damages can be minimized and consequently, the sustainability of modern agricultural cropping systems can be improved.

german version

Keywords/Stichworte:Herbicide resistance; weed control; GMHT; sugar beet; GMO; genetically modified plants; glufosinate; weeds; mulch

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Autor:A. SCHIER, Hochschule für Wirtschaft und Umwelt Nürtingen-Geislingen, Fakultät II, Studiengang Agrarwirtschaft, FG Phytomedizin / Biotechnologie, Neckarsteige 6-10, 72622 Nürtingen, E-Mail: schier@fh-nuertingen.de

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