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The diploma thesis focuses on the hydroponic production of cucumbers. The first part of the thesis is theoretical and deals with the hydroponic growing with the focus on cucumbers. In the practical part, in accordance with the aim of the thesis, there can be found the evaluation of the yield and growth parameters of two greenhouse hydroponic cultures of cucumbers in Jižní Morava, Ltd., depending on the production period and repeated usage of the grow slabs. The results show that the production period and the repeatedly used grow slabs have a significant impact on the yield and growth of cucumbers.

The present work treats the amount of phenolic substances in salad plants. A part of this vast plant group is made of flavonoids, which are important by their accessibility and significant biological activity. Quercetin and rutin are in the main focus of this work. They are noted for their favourable biological effects. Having antioxidant qualities, they prevent and stop the lipid peroxidation and they dispose of free radicals. Flavonoids are used in medicine and can prevent the formation of chronic diseases, such as cardiovascular disease or atherosclerosis. The amount of phenolic substances in the chosen sample of ten salad plants was determined by means of micellar electrokinetic capillary chromatography (MECC) and by high-performance liquid chromatography (HPLC). We have used a freeze-dried material for the analysis. The utmost amount of quercetin was found in lettuce grown on outside garden. 48 600 mg/kg of dry matter highly exceeded the amount of quercetin in other plants. There were other phenolic substancs as well: rosmarinic acid, caffeoylchinol acid and caffeic acid. Among others, we found derivatives and colourants of caffeic acid as well.