EN
Static and field studies concerning the significance of crop rotation at the regulation of weed infestation in winter wheat, triticale and rye were carried out for 12 years at Zakład Produkcyjno-Doświadczalny in Bałcyny. As the control object – cereals grown in a perennial, unprotected monoculture was accepted. Comparative objects were cereals cultivated in a protected by herbicides monoculture, and cereals in unprotected crop rotation, respectively. It was shown that the effectiveness of crop rotation measured by reduction of weed number and weight in relation to unprotected monoculture concerning winter wheat and triticale was slightly lower in comparison with the herbicide effectiveness. In the case of winter rye that effectiveness was better than the effectiveness of herbicides. In the case of winter wheat and winter triticale a lower effectiveness of crop rotation in relation to herbicides probably resulted from the fact that in these crops, in some years regardless of autumn herbicide application, a spring treatment was additionally carried out. However, in the case of winter rye monoculture the application of herbicides every year of the study was limited to one treatment. It was additionally stated that the crop rotation allowed to preserve the biodiversity of weeds community, while herbicide treatments significantly reduced that community.