The characteristics of weeding in cereals were based on 68 phytosociological releves taken from ploughlands of traditional management. The main crops there were: rye, winter wheat, spring wheat, mixture of oat and barley, oat and triticale. Most of the records were taken from winter wheat (30). Cereal was the main crop of the area in Skierbieszowki Landscape Park. 26 samples were taken from spring cereals and 42 samples from winter cereal. Segetal weeds communities of the winter cereals were richer than spring cereals when the number of species is considered, which is shown with an average number of weed species in one single sample: 20.3 species in winter cereals and 17.7 species in spring cereals. Weed coverage varied from 20% to 70% but only occasionally reached 70%. Cereals fields were not very weeded because of good fertilization and crop protection chemicals. Most of the weeds in spring and winter cereals were short-lived rather than perennial, which can be a result of progress rhythm in arable crops. Spring cereals were less weeded than winter cereals. It can be noticed by covering coefficient which were 7.500 in spring cereals and 9.600 in winter cereals.
