The research carried out at the Research and Education Center Gorzyn, unit Brody in 2005-2010, aimed at assessing the biodiversity of weeds in the cultivation of maize on lessive soil. The diversity of weed communities was determined using ecological indicators, which include Simpson diversity index, Margalef index, Shannon-Wiener index. Phytosociological stability of the plant community expressed in the Braun-Blanquet scale was also evaluated. The floristic diversity of the analyzed weed

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... ities occurring on maize plantations slightly changed in particular years of research and the greater differences were observed in relation to the density of specific species. During the field studies 11 species were recorded, but weed community varied over the years. Margalef index was at the level from 0.79 to 1.68, Simpson diversity index was at the level from 0.50 to 0.77, and Shannon-Wiener index from 2.5 to a level slightly exceeding 2.7.