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|Language of final thesis:||Czech|
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|Title of the thesis:||Assessment of achenes germination of spreading species from Asteraceae family|
|Summary:||The aim of this study was to found germination of achenes of dandelion (Taraxacum officinale) on arable land and the impact of locality of dandelion occurrence on its germination. The achenes were collected on three localities -- Oravská Lesna with amended field and meadow, Zubří -- fallow and settlement and Bílá -- site near by forest. The obtained data were entered into the computer software Excel, where average of germination and weights of seeds were calculated. The data were analysed using software UNISTAT (ANOVA and least square different method). The total mean weight of hundreds achenes was 0.0713 g. Statistically significant higher weight was found by achenes coming from sites where soil tillage and herbicide applications were not used (0.0794 g; 0.0792 g). The weights from other localities were lower, its differences were not significant. The mean germination of dandelion achenes was approx. 62.5 %. The locality influenced germination of achenes. The highest mean germination was on locality without soil tillage (78.0 %), the lowest (48.0 %) on the field maintained using different agronomical practices. The light conditions had also the impact on germination of dandelion, the light increased germination. The plants of dandelion (Taraxacum officinale) are spreading throughout whole area of the Czech Republic. This species is often on uncultivated non-agricultural and arable land as well. It is very competitive weed, because it has early and rather quick development during vegetation period. Dandelion is important in decreasing yields of meadows and perennial forage crops on arable land. The control of dandelion is complicated with regards to continual wind spreading of achenes. The proper use of agronomical practices on arable land and efficient control of plants occurring out of arable land are the base for control of this weed.|
|Key words:||dandelion, Taraxacum officinale Weber in Wiggers, Achenes Mass and Germinability|
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