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The aim of the master's thesis was to evaluate the effects of the application of an auxiliary product on the production parameters of potatoes. For this purpose, a one-year small-plot experiment was established in 2022 at the experimental field in Lukavec. The varieties Ornella, Red Anna, Val Blue, and Westamyl were selected for the experiment. For this experiment, the auxiliary product Energen Fulhum Plus was applied. Energen Fulhum Plus is a modified aqueous solution of substance salts obtained by the original decomposition of technical lignosulfonate. It supports the formation of fine root hairs and, as a result, increases the use of moisture and nutrition. It also supports growth, yield, and material composition. After the harvest of the experimental plots, the yield was determined and then samples were taken for chemical analyses. From the experiment, the tuber yield, average tuber weight, starch content, starch yield, dry matter content, nitrogen content, nitrogen yield, and polyphenol content were evaluated. In the monitored year 2022, the temperature and precipitation during the period March - September were above average and it is evident from the results that all the varieties increased the tuber yield (t/ha), average tuber weight (g), starch content (%), starch yield (t/ha), nitrogen content (%) and nitrogen yield (t/ha) compared to the control after the application of the auxiliary product Energen Fulhum Plus. As for the dry matter content (%) after the application of the auxiliary product, the dry matter content increased in all varieties except the Val Blue variety, which showed a slight decrease in dry matter content. The application of the auxiliary preparation had different results for the total content of polyphenols (mg EGA/g dry matter), it increased in the varieties Westamyl and Val Blue and, on the contrary, decreased in the varieties Ornella and Red Anna.

In the bachelor thesis two technologies for potato planting are compared. The first technology is planting with an automatic planter and the second technology is planting with a semi-automatic planter. The measurements were carried out in the Highlands region, which is located in a potato production area. The work focuses on the comparison of technologies in terms of quality of work, area performance and economic efficiency. The latter includes the consumption of post-fertiliser materials and the operating costs of individual planters. Furthermore, the thesis seeks the point at which both technologies achieve the same area efficiency at the same machine operating costs.

The diploma thesis is focused on the evaluation of selected biological, production and processing properties of Jerusalem artichoke tubers. For this purpose, a trial was established in the spring of 2021 in the locality Valečov situated in the district Havlíčkův Brod. Four varieties of Jerusalem artichoke were involved into the trial - Karin, Rút, Skarlet and Zlata. The varieties were grown in three variants. Individual cultivation operations, gradual plant growth and tuber harvest were recorded. For all varieties following parameters were evaluated: tuber yield, mean number of tu-bers per plant, mean tuber weight, tuber dry matter content, inulin content in fresh matter, inulin content in dry matter. The variety Rút achieved five best results in the six studied parameters: yield of 42.6 t/ha, tuber weight of 45.30 g, tuber dry matter content of 32.71 %, inulin content in fresh matter of 16.02 %, inulin content in dry matter of 49.06 %. Dry matter content of harvested tubers was measured. Jerusalem artichoke flour and semolina were produced from dry matter. Jerusalem artichoke flour or semolina replaced a half of a third of common flour in eight food products that were subjected to sensory evaluation.

In the theoretical part, agricultural techniques in the cultivation of potatoes were described and selected weed species were characterized, those that cause damage not only regarding root crops. Chemical protection is currently considered to be an important and most represented method for the regulation of weed species. It resides in the use of plant protecting herbicide products to limit the population of weed species below the economic hazard threshold. The practical part of the bachelor's thesis is focused on monitoring the biology and regulation of weeds in the cultivation of root crops (Solanum tuberosum Wild.). On an experimental plot of land managed by the Samohejl family near the village of Malešice (district České Budějovice) in the South Bohemian Region. Three potato varieties (Adéla, Belana, Marabel) and three different herbicides (Arcade 880 WG, Mistral and Sencor Liquid) were compared and the yield of tubers of cultivated potato varieties was monitored at the same time. The results showed that the effect was different for each herbicide. Due to their active substance (metribuzin), the small effect of these products was manifested on sow thistle and creeping spider. As a secondary result, the yield of tubers of individual varieties of potatoes in different treatments was monitored, when individual varieties responded to different herbicide treatments and thus provided different yields in these cases.