The quality of rooting of ornamental plant cuttings, is influenced by several factors. Most important are: genetic potential, condition of stock plants, storage and transport of cuttings, endogenous factors (carbohydrate content, C / N ratio ...) and environ-mental conditions. In this master`s thesis we researched how different delivery times influence the carbohydrate content (fructose, glucose, sucrose) in cuttings of 4 dif-ferent varieties of geranium ('Acapulco', 'Calliope Dark Red', 'Tango Dark Red' and 'Ville de Paris Red') and how this affects the rooting performance. We also checked if measuring the sugar content with a refractometer could be used as a cheap and fast method for assessing the quality of cuttings. Selected carbohydrates in cuttings were measured by high performance liquid chromatography (HPLC), and we used a visual scale to assess adventitious root growth of cuttings. The statistical analysis of the results showed that the delivery time affected the total sugar content in all 4 varieties, but contrary to expectations, the average total sugar content decreased with the de-livery date not increased as we expected. The highest content of sugars was measured at the first delivery date. Statistical analysis also showed that the quality of rooting has increased with every delivery, the best quality of rooting was observed at the fifth delivery date (at all 4 varieties) and the worst quality of rooting was observed at the first delivery date. We also found out that measuring the sugar content with a refrac-tometer does not allow us to predict the quality of cuttings.
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