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Field studies were conducted in the district Dobrzyniewo Duże. A. vulgaris appears in a similar percentage in winter cereals (52.6%) and spring cereals (47.4%). The highest share occurred in winter rye and in a mixture of oat and spring barley. The highest frequency of Avena fatua (100%) in spring cereals was stated. In winter cereals A. fatua occurred sporadically in subsequent years (0 to 20% of...
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