Abstract

ABSTRACTThis paper presents the results of studies quantifying the effect of some of the tools available in an integrated weed control strategy focusing on problematic annual grasses in crop rotations with grass seed production. The paper presents the results of experiments demonstrating the influence of competitiveness of the crop on the development of annual grass weeds. The experiments quantify the influence of establishment at different row distance, plant density, sowing depth and cultivar type. The paper further presents the results showing how a change in establishment time from autumn to spring influences the germination rate of four important annual grasses. The study demonstrated that springtime establishment offers the opportunity to reduce problems with Apera spica-venti and Poa trivialis and to a lesser extent with Alopecurus myosuroides and Vulpia myuros. The study further showed that the false seedbed technique can be a very effective tool to reduce problems with annual grasses. The populations of two of the investigated species, P. trivialis and V. myuros, were reduced by almost 80% applying the false seedbed technique. Dependent on the density and species composition of annual grasses expected these IWM tools can be used in strategies to secure a high quality in grass seed production.

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