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Zur Eignung nicht eingesäter Teilflächen in Getreideschlägen für die störungsfreie, bildanalytische Ermittlung von Unkrautschadschwellen |
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| Authors: | W Kühbauch W Petry |
| Institution: | Lehrstuhl für Allgemeinen Pflanzenbau der Universitat Bonn |
| Abstract: | Suitability of not seeded test squares in crop fields for reliable ascertainment of weed threshold levels by quantitative image analysis The possibility to measure weed ground cover using a computerized image analysis system has been reported in former investigations. In the present studies suitability of not seeded test squares in crop fields for reliable detection of weed ground cover for precise determination of weed threshold levels (beyond that crop yield losses are economically greater than costs for weed control) has been tested. Test squares in which weed grew without competing crop as well as corresponding squares including both, growing crop and weeds, were examined for weed ground cover by computer assisted quantitative image analysis of color slides taken from the respective squares. In the squares, that includes crop and weeds, the former was removed immediately before taking the slides. In both seasons from the beginning of weed growth in October to the latest feasible application time of herbicides in April weed growth as measured by ground cover in the not seeded test squares did not differ significantly from that grown under competition of winter barley. Results indicate, that up to the growth stage of weed where herbicides if ever should be applied at the latest, crop-free test areas in the same field could serve for correct determination of weed growth by image analysis. |
| Keywords: | Image analysis weed control |