Plevele ekologicky a konvenčně pěstovaných plodin

The thesis was evaluated using numerical method occurrence of weeds in crops grown in conventional and organic farming. Viewed crops were located on land owned by companies JASNO, spol. s.r.o. and AGRODELTA, s.r.o. In organic farming were eva-luated crops: winter wheat undersowing with vetch and spring oat. In conventional farming were evaluated crops: winter wheat, winter rape and spring wheat undersowing with alfalfa. In organically managed fields was evaluated occurrence of 35 weed spe-cies, in conventionally managed fields, the number of evaluated weeds was 17. Most frequently established weed species in organically managed fields were: Tripleurospermum inodorum, Cirsium arvense and Sinapis arvensis. In conventional fields were most often evaulated species: Tripleurospermum inodorum, Poa annua and Viola arvensis