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This thesis was aimed on the elaboration of literature review and a on the practical assessment of the field trial with a mixtures of varieties. The first part of the literature review was devoted to crop diversification in agriculture, which is closely related to mixtures of varieties. In the other part were characterized advantages of mixed varieties, such as better yield of mixed varieties in comparison with component varieties. We have also described some of the mechanisms for the creation of income (and mechanisms against pathogens). Another part was devoted to quality of mixed varieties. The last part was devoted to disadvantages resulting from the cultivation of mixed varieties. In the year 2013 it was founded field trial in Žabčice -- Nova obora, which was investigated in practical part. It was investigated effect of three binary mixtures. These mixtures were identified as : Elan + Golem, Viriato + Tobak Baletka and Annie. Each of pure component varieties were planted for checking and comparison. The main examined factors were yield, weight of thousand seeds, sedimentation index, wet gluten, gluten index, falling number, nitrogenous substances, weight and height of the plant. The best yield reached mixture Elan + Golem (average yield was 9.61 t / ha), it's yield reached the yield of the best variety Elan (9.92 t / ha). The mixture Tobak + Annie had higher average value of the falling number and nitrogenous substances than the pure varieties, average results this mixture reached in values of sedimentation index and wet gluten. In the total evaluation this mixture was recommended as the best one. The holder of the quality in this mixture was the Annie variety. This mixture has fulfilled requirements for baking quality and reached Czech elite level.

The balance of potassium and phosphorus were observed at long-term 17-year field experiments with different fertilizing systems. The field experiments were located at five sites in the Czech Republic (Červený Újezd, Hněvčeves, Humpolec, Lukavec and Suchdol) with different soil and climatic conditions. The balances were observed at: treatments with organic fertilization (sewage sludge, FYM), treatments with mineral fertilization (NPK, N, N + straw) and unfertilized control treatment, as well. Two experiments were realized: one with crop rotation (potatoes, winter wheat, spring barley) at all mentioned sites and the second was monoculture maize experiment at Červený Újezd and Suchdol sites. The positive balance of phosphorus was at the treatments with sewage sludge (SS) as well as with farmyard manure (FYM) application and at the NPK treatment. The average phosphorus balance ranged between +1.8 and +14.0 kg/ha/year at the treatments NPK, between +7.2 and +21.6 kg/ha/year at treatments with FYM application and between +66.7 and +75.6 kg/ha/year at SS treatments, respectively. The balance of phosphorus with a higher dose of sewage sludge reached +249.6 kg/ha/year. The average negative balance of phosphorus (from -27.5 to -13.4 kg/ha/year) was calculated at the treatments N and N + straw. The balance of control unfertilized treatments ranged between -21.9 and -11.0 kg/ha/year. The average positive balance of potassium in the experiment with crop rotation was estimated at all of FYM treatments. The balance reached the values from +2.3 to +30.1 kg/ha/year. On the contrary, the balance at FYM treatment in experiment with maize monoculture was negative (-15.2 kg K/ha/year). The balance of potassium in experiment with crop rotation ranged between -9.5 and 33.2 kg/ha/year at the NPK treatments. Similar values were obtained in the experiment with monoculture, where the balance at the NPK treatment reached +32.1 kg K/ha/year. The negative balance of potassium (between -69.2 and -8.9 kg/ha/year) was obtained at treatments with sewage sludge application. The most negative balances were calculated at N and N+straw treatments (-104 to -55.0 kg/ha/year) and as expected at Control (-73.2 to -43.6 kg K/ha/year). The bioavailable soil phosphorus and potassium contents changes were in most cases in close relation with balances calculated. Soil variability in observed soil factors was found in the plots and confirms the assumption that the system of fertilization affects crop yields.

This thesis deals with the network of field and forest in the cadastre unit of Suchovršice and suggest to supplement the network of unpaved roads. In the theoretical part is summarized the history of the field and forest roads. Then there is a division of field and forest roads according to the relevant standards ČSN. Another section is devoted to maintenance events, repairs and reconstructions of field and forest roads. There are outlined the possibility of financing the construction of new roads. Follow a description of the most important objects on the field and forest paths. In the practical part is defined area of interest including the broader territorial relations. Then there are described the current field and forest roads in the area of interest, which were plotted to the map of road networks. This map is the result of performed detailed field research. On the basis of digitized map stable cadastre is described the road network in 1840. Due to the fact could be compared to road networks in two different time stages. The existing system of field and forest roads is evaluated. For ratings are calculated densities of both types of roads in the area of interest. The calculated density of the field and forest roads are assessed with an average density of roads in the Czech Republic. The density of field and forest roads in the selected area is higher than the national average. This can be explained by the type of relief which corresponds hilly land type. Overall, the number and length of roads is sufficient. However, density of forest haul routes is insufficinet. Problematic is also the technical condition of rural roads in the selected area. Based on the analysis of historical and current road network is designed to complement the rural roads within the land adjustment. Land adjustment just underway, and draft routes can be used to compile Plan of common facilities.

This thesis deals with the evaluation of resistance to fungal diseases at selected crossings of grapevine. The experiment was done in 2014 at the experimental station in the cadastral region of Lednice in Moravia. 20 seedlings emerged from intersecting hybrids were tested. The experiment confirmed that the variety Bianca is a good donor of the resistance and therefore it is almost resistant to local races of pathogen of grapevine mildew. Hibernal variety is moderately resistant to grapevine mildew.

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