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Camera-guided weed control – a technology for practice

Summary
The complete article is written in German
A technology of site-specific weed control using digital image analysis and georeferenced application maps has been applied since 2004 in cereals, rape, maize and sugar beet. For camera-guided weed sampling, bi-spectral cameras took well focused grey scale images with a strong contrast of crops and weeds. For the identification of weed species, characteristic shape features of plants were calculated and compared with a database. With an identification rate from 73 % (malt barley) up to 77 % (sugar beets) application maps were created from classified images for site-specific weed control. Site-specific herbicide application was performed using a GPS-controlled patch sprayer with three separated hydraulic circuits. Herbicide savings ranged from 22 % to 70 % for grass weed species and from 4 % to 80 % for broadleaf weed species. Average savings of site-specific weed control were 27.30 €/ha. Therefore, calculated costs of 16.26 €/ha for camera-guided weed sampling and site-specific weed control using a three-chambered patch sprayer were compensated.

german version

Keywords/Stichworte:Camera-guided weed control; image analysis; herbicide savings

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Autor:H. OEBEL, R. GERHARDS, Universität Hohenheim, Institut für Phytomedizin, Otto Sander Str. 5, D-70599 Hohenheim, E-Mail: oebel@uni-hohenheim.de, gerhards@uni-hohenheim.de

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