Zachwaszczenie warstwy ornej gleb lessowych Płaskowyżu Nałęczowskiego w zależności od formy uprawnej zbóż i rzeźby terenu [Soil weed seed bank at ploughingl layer on the Nałęczów Plateau in relation to cereal crops and sculpture elements]

The weed seed bank in the ploughing layer (0–25 cm deep) of loess soils, located at top, slope and slope foot, is presented in the papaer. Soil samples, taken just affer the harvest of winter and spring cereals, in the Nałęczów surroundings (east-middle Poland) were the investigative material. It was proved that the most of weed seeds and fruits were the winter cereals bocated at the slopes and slopes foot. The diaspors of short-lived weeds were dominant III–V degree of stability in the soil covered all sculpture elements