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The thesis deals with the issue of defoliation after quality grapes. The work deals with the comparison of mechanical and manual defoliation. The first part deals with searching and displaying information with this issue. The second part is about my experiment, its processing and its own recommendations. I was able to do this experiment on the Plaček vineyard in Moravské Branice where I used 11 lines of Sauvignon blanc variety for the experiment when every line indicates another experiment variation. Defoliation zone of grapes took place since 7.6.2018. Manual defoliation always removed 1-3 leafs and other part from defoliation zone. Since 15.6.2018 we used a mechanized defoliation using the defoliator. The following experimental variations were made in the same terms both manually and mechanically. The last mechanical defoliation was on 1.7.2018 and we performed a defoliation variant as a control. The last attempts were made between 26.7 and 2.8.2018 where we used another method of defoliation zone of grapes for a purpose to slown down the ripening. During the ripening of the grapes their health and quality was monitored. In four weeks carried out the evaluation of qualitative grapes. The berry sugar content, Ph value, acid content, nitrogen content and other defoliation-related parameters were measured. All measurements were taking place at a school laboratory in Lednice. All data have been evaluated and we written own recommendations for winemakers and vineyard oweners.

Machine harvesting is the most widely expanded vineyard mechanization practices today. Foreign research into the effects of mechanization demonstrated that the grape quality was unaffected, in some cases, improved with the introduction of machine harvesting. In 2015 within the framework of this diploma work the experiment was performed by Sauvignon blanc. All data were subjected to Analysis of variance at P < 0,05. Although statistical differences were found in the grapes by total acidity and type of harvesting, statistical differences were not found in wine. Wine produced from machine grape harvesting were more fruity in sensory analysis.

The purpose of the thesis on topic Effect of date of defoliation on aromatic profile ´Sauvignon blanc´ wine was to find out the effect of removing leaves from grapes zone on qualitative and quantitative parameter of grapes of this species. The practical part of the experiment with defoliation in different terms was carried out during 2015 on a vineyard in Svatobořice-Mistřín. Part of the practical experiment was the production of wines from different variants and and evaluated the sensory properties of wine.

Flavours for Sauvignon blanc and influence their content agrotechnical interventions This work was tasked to determine aromatics in Sauvignon blanc and influence their content agrotechnical interventions. Depending on content were observed actual information regarding aromatic compounds in Sauvignon blanc. Next were observed influence of irrigation, nutrition, and green works to aromatics. In conclusion, was recommended suitable agro-techniques for cultivation. The result of work to achieve the green character of this variety was recommended do not defoliated bush, minimize irrigation, soil nitrogen fertilization and the use of copper sprays. To achieve fruity character was recommended defoliation, maximization of irrigation, foliar fertilization with nitrogen and sulfur and copper sprays disuse.