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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Studium vybraných fyziologických vlastnosti populací polních plevelů z odlišných stanovišť
 Frantová, Nicole
The diploma thesis: Study of Selected Physiological Features of Field Weed Populations from Different Habitats investigates the effects of temperature and habitat influences on seed germination of redroot pigweed Amaranthus retroflexus and German chamomile Matricaria chamomilla. Seeds of redroot pigweed were collected from the habitats: field margin, tree alley, railway and field. Seeds of chamomile were collected from the habitats: field margin, tree alley and were also bought. The seeds were exposed to temperatures 6 °C, 8 °C and 18 °C.The highest seed germination of both species was at 18 °C and the lowest was at 6 °C. The highest seed germination of redroot pigweed was recorded from the „field margin“ habitat 34,67 % and the lowest seed germination from the „field“ habitat 28,67 %. The highest seed germination of German chamomile was recorded from the „bought“ habitat 86,67 % and the lowest seed germination from the „field margin“ habitat 34 %.
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Comparison choice cultural and weed kinds form stock Amaranthus
 VÁLEK, Jan
Amaranthus (L.) belongs to among old cultural crops. Cultural forms of some species were already grown by Aztecs and Incs in ancient times. High nutritive value of seeds redounded to rediscovery of the crops. Tested varieties of cultural amaranth get to the interaction whit wild species of amaranth. This work would had contribute to better knowledge of ecology in the hybrid of cultural variety and weed (A. x turicensis = A. cruentus x A. retroflexus) The aim of this work was to describe production and morphometric characteristics of selected relative cultural and weed species of amaranth (Amaranthus hypochondriacus, Amaranthus cruentus, Amaranthus retroflexus), the hybrid A. x turicensis and to determinate occurrence and survival of weed species A. retroflexus onplaces, where cultural amarant was grown. A. retroflexus shows as a very resistant to damage. Cultural species responded on damage by reduction of majority observed parameters. Cultural species of amaranth responded more on different conditions substrate than the weed species. Response of hybrid on different substratum conditions was in the middle of spectrum of the response in cultural parents and the weed species. Indiference of the hybrid to substrate should be better clear up in the next studies. Weed species is little sensitive to competicion and his characteristics (total biomass, legth inflorescence, height of plants, number of leaves) are different not much. Effect of competition on hybrid shows his non - uniform response probably caused by his considerable variability Absence of cultural amarant and interspecific hybrids shows on relation of these plants to warmer weather that is probably the main factor for their occurrence.
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