Site-specific weed control - dynamics of weed populations in arable fields using GIS and expert systems
Keywords - Precision-farming, site-specific weed control, patch sprayer, weed population model
Description
Weed seedling populations have been found spatially and temporally heterogeneous within agricultural fields. They often occur in aggregated patches of varying size or in stripes along the direction of cultivation. The variation in weed seedling populations has so far been ignored for weed management decisions since techniques to assess the weed seedling distribution in acceptable time were not available. Nevertheless, most agree that a great potential for herbicide savings exists, when weed control methods are applied site-specifically. The spatial and temporal dynamics of weed populations are not well understood. If weed populations are stable from year to year, it would be possible to use last year's weed map to adjust for next year's weed management decisions. The dynamics of weed populations is influenced by farming practices, soil parameters and weather conditions. Still, only a few results are available to quantify those effects. An understanding of fundamental weed population biology would improve our ability to develop site-specific management decisions. One objective is to develop an expert system that allows to forcast the spatial and temporal dynamics of weed populations in arable fields. A second objective is to develop valid decision algorithms for patch spraying.
WEIS, M., R. GERHARDS, 2007: Automatic weed species identification using structural shape features and classification algorithms. 6th European Conf. on Precision Agriculture, Greece, 2007, accepted.
SÖKEFELD, M., R. GERHARDS, H. OEBEL, R.-D. THERBURG, 2007: Image acquisition for weed detection and identification by digital image analysis. 6th European Conf. on Precision Agriculture, Greece, 2007, accepted.
GERHARDS, R., H. OEBEL, 2006: Practical experiences with a system for site-specific weed control in arable crops using real-time image analysis and GPS-controlled patch spraying. Weed Research 46, 185-193.
OEBEL, H., R. GERHARDS, 2006: Kameragesteuerte Unkrautbekämpfung – eine Verfahrenstechnik für die Praxis. Journal of Plant Diseases and Protection Special Issue XX, 181-187.
GERHARDS, R., S. CHRISTENSEN, 2006: Site-specific weed management. In: Precision Farming. edt. Ancha Srinivasan, Kita, Japan, The Haworth Reference Press, Handbook of Precision Agriculture: Principles and Applications, pp. 185-205.
SÖKEFELD, M., R. GERHARDS, H. OEBEL, M. WEISS, P. RISSER, M. PFLUGFELDER, 2006: Wissensbasierte Artenerkennung anhand von Konturmerkmalen der Pflanzen mit verschiedenen Klassifikationsalgorithmen. Computer Bildanalyse in der Landwirtschaft Workshop 2006, ATB-Postdam, 51-59.
Dicke, D., Krohmann, P. & Gerhards R. (2003): Spatial and temporal dynamics of weed populations in crop rotations under the influence of site-specific weed control. Precision Agriculture, Ed. J. Stafford, A. Werner, Wageningen Academic Publishers, 157-163.
Dicke, D., Fries, A. & Gerhards, R. (2004): Ermittlung von Schadschwellen für die teilschlagspezifische Unkrautbekämpfung im Braugerstenanbau. Zeitschrift für Pflanzenkrankheiten und Pflanzenschutz, Sonderheft XIX, ### (2004), ISSN 0938-9938, Eugen Ulmer GmbH & Co., Stuttgart.
Oebel, H., R. Gerhards, G. Beckers, D. Dicke, M. Sökefeld, R. Lock, A. Nabout & R.-D. Therburg (2004): Teilschlagspezifische Unkrautbekämpfung durch raumbezogene Bildverarbeitung im Offline (und Online)- Verfahren (TURBO)- Erste Erfahrungen aus der Praxis. Zeitschrift für Pflanzenkrankheiten und Pflanzenschutz, Sonderheft XIX, ### (2004), ISSN 0938-9938, Eugen Ulmer GmbH & Co., Stuttgart.
Dicke, D.,Gerhards, R., Kühbauch, W.(2004): Überprüfung bestehender Schadschwellen auf ihre Eignung für die Teilschlagspezifische Unkrautbekämpfung in Braugerste unter Verwendung eines GIS. 25. GIL Jahrestagung- Integration und Datensicherheit- Anforderungen, Konflikte und Perspektiven. Bonn, Germany, 2004., 343-346 (in German)
Gerhards, R., Dicke, D., Oebel, H. (2005): Testing and analysing decision rules for site-specific weed control in malt barley ( Hordeum vulgare L.) using a Geographic Information System (accepted for journal publication).
Dicke, D., Gerhards, R., Kühbauch, W. (2005): Predicting dynamics of Chenopodium album in a four year crop rotation using site-specific weed control.Precision Agriculture´05,Ed. J. Stafford, Wageningen Academic Publishers,779-786.
Dicke, D., Gerhards, R., Büchse, A., Hurle, K. (2005): Modeling spatial and temporal dynamics of Chenopodium album under the influence of site-specific weed control (accepted for journal publication).
Dicke, D., Kühbauch, W. (2005): Einsatz von satellitengestützter Fernerkundung zur Früherkennung von herbizidbedingten Schäden in Mais. Lecture Notes in Informatics, 35. Jahrestagung der Gesellschaft für Informatik, 19.-22.09.2005, in press.
activities D. Dicke
- Scientist at the Institute of Agronomy and Crop Science
- Lecture: Unkrautbiologie und Unkrautkontrolle mit Übungen
Oral presentations
Dicke, D. Gerhards, R., Büchse, A. & Hurle, K. (Keynotepresentation): Modeling spatial and temporal dynamics of weed populations under the influence of site-specific weed control - a new approach. 4th International Weed Science Congress 2004, Durban, South Africa , Abstract book: Weed Science serving humanity, page 36.
Gerhards, R. & Dicke, D.: New application tools as parts of precision farming concepts in plant protection. Bayer CropScience- International Workshop: Future Trends in Weed Control Technology, Frankfurt, 25-27.02. 2004.
Dicke, D.: Überprüfung von Schadschwellen für die teilschlagspezifische Unkrautkontrolle in Braugerste mit Hilfe eines einfachen Geoinformationssystems. IKB Workshop On-Farm Research, Wissenschaftszentrum Weihenstephan (15.-16.11.04)
Dicke, D. (Invited presentation): Teilschlagspezifische Unkrautkontrolle als Werkzeug im Integrierten Pflanzenschutz. University of Prague, 07.04.2004.
Dicke, D., Gerhards, R.,Invited presentation: Precision Farming in plant protection. Landesanstalt für Pflanzenbau und Pflanzenschutz. Mainz. (11.2002)
Dicke, D., Krohmann, P., Gerhards, R.:Spatial and temporal dynamics of weed populations in crop rotations under the influence of site-specific weed control. 4th European Conference on Precision Agriculture (ECPA), Berlin (2003)
Dicke, D.: Automatic weed detection and site-specific weed control. University of Wageningen, 05.05.2004.
Dicke, D, Fries, A., Gerhards, R.: Ermittlung von Schadschwellen für die teilschlagspezifische Unkrautbekämpfung im Braugerstenanbau, 22. Deutsche Arbeitsbesprechung über Fragen der Unkrautbiologie und -bekämpfung, Stuttgart- Hohenheim (2004)
Poster presentations
Dicke, D., Gerhards, R.: Teilschlagspezifische Unkrautkontrolle. Deutsche Pflanzenschutztagung, Bonn. (09.2002)
Dicke, D. & Gerhards, R.: Detecting negative side effects of herbicides on crop applying remote sensing. 24th EARSeL Symposium: New Strategies for European Remote Sensing 25-27 May 2004, Dubrovnik, Croatia (Proceedings).
further research topics
- Economic weed thresholds for site-specific weed control in cereal crops
- Modelling weed distribution on arable fields under the influence of site-specific weed control by use of weed population models
- Detecting negative side effects of herbicides on crops applying remote sensing
- Site-specific weed control by use of a computer controlled field sprayer
- On-Farm research field trials
