Cropfield-weed communities of northern Poland on the eastern and western sides of the Vistula

The research was carried out in the following 9 mesoregions of northem Poland, located on either side of the Vistula: Cassubian Coast, Cassubian Lakeland, Elbląg Plateaux, Górowo Plateaux, Ermelandic Plain, Iława Lakeland, Vistula Delta, Starogard Lakeland and Lower Vistula Valley. A total of 11 cropfield-weed communities have been distinguished and described. Those found in cereal crops included: Teesdaleo-Arnoseridetum, Papaveretum argemones, a transition community between Vicietum tetraspermae and Aphano-Matricarietum, Aphano-Matricarietum, Lathvro-Melandrietum and Spergulo-Chrysanthemetum segeti. In root crops the occurrence was found of: Digitarietum ischaemii, Echinochloo-Setarietum, Lamio-Veronicetum politae, Galinsogo-Setarietum, Fumarietum officinalis and Spergulo-Chrysanthemetum segeti. Due to the presence in the patches of most communities, especially root crop communities, of many common species, they show a number of similarities, floristic and structural