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The impact of post harvest weed seed predation compared to stubble cultivation on weed seed decline

Summary
The complete article is written in German
Experiments were conducted in 2002 and 2003 to study the impact of weed seed losses due to predation without stubble cultivation and fatal germination after stubble cultivation between harvest of winter wheat and seeding of winter barley. In both years, defined numbers of seeds from different weed species and small annual grains where placed in plots on a winter wheat stubble and predation by birds, rodents and small organisms in the soil was determined. Additionally, the same amount of seeds were filled in flax bags and buried into the stubble after cultivation. Six weeks later, the number of viable and dormant seeds was counted. Weed seed decline caused by predators varied between 30 and 60 %. Small annual grains were almost completely fed by predators. In 2003 weed seed decline caused by predators was higher than by fatal germination after stubble cultivation. The results can be used to predict dynamics of weed populations under different tillage practices.

german version

Keywords/Stichworte:Weed control; predation; stubble cultivation

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Autor:D. DICKE, Institut für Pflanzenbau, Universität Bonn, Katzenburgweg 5, 53115 Bonn, E-Mail: d.dicke@uni-bonn.de;
R. GERHARDS, Institut für Phytomedizin (360), Herbologie, Universität Hohenheim, Otto-Sander-Straße 5, 70593 Stuttgart, E-Mail: gerhards@uni-hohenheim.de

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