The experiment was carried out in the years 1982-1985 on an arable field on leached brown soil and on a permanent meadow with proper deluvial soil. The studied species Dactylis glomerata cv. Brudzyńska and Phleum pratense cv. Skrzeszowicka were grown in monoculture and in mixtures. Content of each species in the mixture was 50%. There were three cuts in the vegetation period. Two times of the first growth were cutted at the full heading of cocksfoot and at the full heading of timothy. The influence of Dactylis glomerata on the Phleum pratense shoots weight was negative and increased in the following years. It was greater on arable land than on permanent meadow. There were observed more negative effect in autumn than in spring.
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