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Abundance- and dispersiondynamics of weeds under sensor-based herbicide application within a spring barley field

Summary
The complete article is written in German
Within a spring barley field in two successive years variable rates of herbicides were applied in real time with a sensor operated field sprayer. Grid sampling was conducted along a 24 m x 50 m sampling grid. The two weed species Stellaria media L. and Polygonium convolvulus L. were most abundant. The average Jaccard number of 0.5 showed that between the two years the species composition at the sampling points was different. The relative frequency of the two main species at the sampling points was for black bindweed 26 % (2002), 63 % (2003) and for common chickweed 59 % (2002) and 19 % (2003).
The dispersion of the weeds between the two years was different. The analysis of the spatial covariance between the sensor values of 2002 and 2003 showed that there was no spatial dependence of the weed occurrence between the two years.

german version

Keywords/Stichworte:Site specific weed control; sensor; abundance; dispersion

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Autor:K.-H. DAMMER, A. GIEBEL, Leibniz-Institut für Agrartechnik Potsdam-Bornim e.V., Abteilung Technik im Pflanzenbau, Max-Eyth-Allee 100, D-14469 Potsdam, E-Mail: kdammer@atb-potsdam.de;
G. WARTENBERG, Am Raubfang 16, D-14469 Potsdam, E-Mail: Gerhard.Wartenberg@gmx.de

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