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KOLAŘOVA MICHAELA, TYSER LUDĚK, SOUKUP JOSEF. 2015. Weed Species Diversity in the Czech Republic Under Diff erent Farming and Site Conditions. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 63(3): 741–749. The aim of this study was to explore the composition of weed vegetation on arable land in selected areas of the Czech Republic and to determine the level of -diversity. Our survey was conducted at 27 conventional and 35 organic farms from 2006–2008. In each sampled fi eld, one phytocoenological releve of a standard size of 100 m2 was recorded in the central part of the fi eld. The species cover was estimated. The total -diversity was expressed as the total number of weed species recorded. -diversity of diff erent farming systems, altitudes and crops was calculated. Subsequently, the species were divided on the basis of their perenniality. In total, 172 weed species were found – 123 and 162 in conventional and organic farming, respectively. The highest number of species was found in winter cereals and at medium altitudes. Chenopodium album was recorded as the species with the highest constancy in both types of farming. In total, 89 annuals, 17 biennials and 15 perennials were observed in conventional farming, and 109 annuals, 23 biennials, 28 perennials and 2 semiparasitic annuals were found in organic farming.

Weed Species Diversity in the Czech Republic Under Different Farming and Site Conditions