Impact of 40 Years Use of Different Herbicide Strategies and Crop Rotations on Weed Communities in Two Sites of the Czech Republic

Understanding the impact of farming practices on composition weed communities has important implications for sustainability management strategies. This study analyses data from a 40-year experiment established at two sites in Czech Republic 1972. The herbicide strategies was evaluated multi-crop rotation (MCR) with 50% cereals, and simple crop rotations (SCR) 75% cereals. following were compared: (1) treatment synthetic auxins only rotation, (2) targeted combinations particular use sulfonylureas, triazines, ureas auxins. Untreated plots included reference purposes. Results showed that major factor determining community explained 18% total variation case untreated controls. However, reduced effect to 11%. highest average increase Shannon’s diversity index by 25.4% after 44 years SCR, it decreased 15.1% treated MCR. Weed species evenness € increased all an 23%. Simpson’s dominance both auxins, 44.8% decrease SCR. On contrary, 33,3% Herbicide selection depended occurrence density target species, led greater population densities diversified rotations.