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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Mapping of hemlock plamatého (Conium maculatum L.) in Central Bohemia region
 Čech, Ondřej ; Brant, Václav (advisor) ; Václav, Václav (referee)
Poison hemlock (conium maculatum L.) is a weedy species occurring in plant communities near field borders and in agrophytocoenosis. It invades into these crops: winter wheat, pea, sugar beet, white mustard and also in fodder plants. The origin of the invasion lies predominantly in plant communities around field borders. The aim of this thesis was to elaborate survey of poison hemlock occurrence on arable lands and also within plant communities around field margin in the Middle Bohemia. The study was carried on with the use of GPS navigation (Garmin Etrex 30, Garmin Ltd., USA). Each spot of occurrence was determined by visual recognition in slowly moving car (30-40 km/h). Transit between two urban areas was done in both directions every time. Minimal distance between each spot is between 8-10 m in this type of determination. Data records were transferred to ortofoto map data layer. The density of plants in each spot was evaluated consequently. The presence of this species in the crops was also evaluated during the survey. 25 field segments of winter canola, two segments of pea, one segment of white mustard and four segments of sugar beet were recorded the studied region. The intensity of the weed infestation around the road network strongly varied. Both solitary plants and consistent stands of poison hemlock were described. The method of evaluation of spot quantity on the longitudinal track was verified in this study. The study confirmed impact of plant communities around field borders on the occurrence of poison hemlock in agrophytocoenosis.
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