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Summary The field experiment was carried out in 2009–2011 at Swojec Experimental Station of the University of Environmental and Life Science in Wroclaw. The aim of the studies was to compare two methods of sowing of winter rye (pure stand and variety mixture) that include an application of permitted fertilizer and seed dressing in organic farming and evaluation of weed infestation. Variety mixture of rye significantly decreased number of weeds both during tillering and flowering stages of rye as well as their dry weight in comparison with weed infestation in pure stand of rye. Winter rye grown in variety mixture was characterized by higher tillering and higher index of LAI (leaf area index) what resulted in beneficial shadowing and it was a consequence of lower weed infestation on the plots with three-variety mixture. Varying levels of agricultural practices did not significantly affect weed infestation, but it was noticed that the number of weeds and their dry weight were a little bit lower after the use of fertilizer Estakizeryt.

progress in plant protection

The formation of weed infestation of winter rye under organic farming system depending on the method of sowing and the use of seed dressing and mineral fertilizer