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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.

The main objective of the bachelor thesis was to conduct a literature review in the field of fertilization and nutrition of the potato plant and to collect and sort information on new approaches used in potato cultivation. The thesis describes the methods of fertilization and nutrition with organic fertilizers, inorganic fertilizers (including essential elements) and their effect on potato growth and quality. Furthermore, the possibilities of using microbial and biochemical approaches to improve potato nutrition and their advantages or disadvantages are presented. The paper also presents opportunities to improve fertilizer use and minimize negative environmental impacts using new technologies and innovative practices. Finally, three practical examples from potato farms are presented.

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.

This work deals with mapping the development of root crops in the Czech Republic. The purpose is to describe them, evaluate the development from 1920 to the present, the influences that led to changes in the development of root crops at a given time and mapping their development using ArcGIS. This work is divided into two stages. The first stage contains a literature search that describes the root crops in detail, the Geographic Information System (GIS). Methodology of data and data collection and description of their use. The second stage of this work contains a description of the effects on changes in the development of root crops over a period using the collected data and data, then their output in the form of a map created in GIS software.

Phylum Actinobacteriota represents one of the major phyla in plant and soil environments. Known for the ability to produce numerous secondary metabolites, Actinobacteriota may affect other bacteria and plants in various ways. The thesis aimed at assessing the connection between the production of secondary metabolites and interactions of actinobacteria in plant and soil environments. In the first part, we assessed how rare actinobacteria from acid soil affect cultivable soil bacteria. We isolated a collection of actinobacteria from acid soil dominated by previously uncultivable lineage and isolated a representative described as a new family Treboniaceae and multiple other potentially novel species of known genera. The genome and metabolome analysis of Trebonia kvetii, sp.nov. gen.nov., demonstrated its ability to produce unusual and potentially novel bioactive metabolites. We designed an experiment where a single strain was co-cultivated with the total soil bacterial community of the same soil in a set up, where a free exchange of diffusible metabolites was allowed between them. Three actinobacteria strains coming from distinct lineages were selected for this interaction. Each strain significantly and specifically affected cultivable bacteria as well as the metabolite pool, part of which was induced...

Lyckeby concentrate is a new organic fertilizer made from waste tuber juice in the production of potato starch. The aim of the diploma thesis was to evaluate the effect of this fertilizer on selected varieties of starch potatoes. Two varieties Euroresa and Eurostarch were monitored, which are the most cultivated in the company Agrospol, Malý Bor a.s. The fertilizer was applied in two variants. The first variant was fertilized 2 t.ha-1 before planting and the second variant had a dose of 4 t.ha-1 before planting. It included an unfertilized control plot. In the experiment, the yield of tubers and starch, the starch content, the average weight of tubers, the average number of tubers and stems per tuft and the nitrogen content were evaluated. In the monitored experiment, both fertilization variants showed an increased yield of tubers and an increased yield of starch. The increase in tuber yield was influenced by the average increase in tuber weight and number. The Euroresa variety showed an increase in starch yield per hectare of 6.53% compared to the control. The Eurostarch variety had an increase in starch yield per hectare of up to 23.74% compared to the control.

The diploma thesis deals with the evaluation of potato variety impact on final chips sensory quality. Lab experiment was focused on three potato varieties used in INTERSNACK Choustník, a.s. production process, where dry matter, starch con-tent, reducing sugars and texture traits were evaluated. Lastly, chips´ sensory analysis made of given varieties was examined. Company secret did not let us re-veal the real names of potato varieties, so they are identified by Slovak alphabet letters: A, B, and C. The best sensory quality was measured in chips produced from B variety, characterised by suitable chemical parameters for chips processing. The other variates are suitable for chips processing as well, but the final chips´ sensory evaluation reported some irregularities, which could cause in C variety the higher content of reducing sugars, and in A variety agrotechnology issues.

The aim of the bachelor thesis is to evaluate the response of varieties with different lengths of vegetation to single and divided doses of nitrogen in potato growing. To point out the effect of nitrogen on tuber yield. The results of the experiment also consider the technology of cultivation, treatment and conditions during the vegetation. The work also records individual differences between varieties and starchy of tubers. The experiment was performed on a plot of land near Havlíčkův Brod near the experimental station in Valečov. Two variants of varieties with different vegetation times were selected for the experiment. The plot was divided into three variants of nitrogen application in three replicates. In the first variant, which was not fertilized with nitrogen, there was no high yield, but in the second variant, which was fertilized with nitrogen before and during vegetation, and in the third variant with fertilization before vegetation, the increase in yield was noticeable for selected varieties. At the same time, there were different values in determining the proportion of starch in tubers.

The bachelor thesis is aimed at the use of diagnostic methods to optimize the nutrition of potatoes in operational practice. The pilot field experiment was established in Lutopecny in the Zlín Region. The following variants were included in the experiment: 1. LAV + 8% urea solution, 2. ALZON 46 by Nmin and 3. ALZON 46 by Nmin + 8% urea solution. The first option reflects the traditional system of potato fertilization on the grower's land. On the second variant, the nitrogen nutrition of the potatoes was optimized according to the content of mineral nitrogen (Nmin) in the soil and the urea with the nitrification inhibitor (ALZON 46) was chosen. The third variant is based on variant n.2 and should be supplemented with foliar application of urea according to nitrogen and phosphorus content in plant biomass. Although the nutritional status of the crop was good, supplemental fertilization with 8% urea solution was applied. The average of total tuber yield was 30% lower in the traditional technology variant than in the nitrogen-optimized variants. Supplemental fertilization with 8% urea solution per sheet in option 3 did not cause additional yield increase because the nutrient status of the urea fertilization with nitrification inhibitor based on the Nmin content of soil was assessed as optimal. Based on one-year results, it is advisable to correct the nitrogen dose for potato fertilization after planting according to the mineral nitrogen content of the soil.

The aim of the thesis was to work out a research of the literature and determine the influence of the size fraction of potatoes on their technological quality. In cooperation with a company Beskyd Fryčovice, a.s. the samples of their processed potato varieties were provided. Mass fractionation of the available potato tuber samples was performed and the selected quality parameters, which are important in terms of potato storage and processing, were then determined. The focus was on the amount of starch, nitrogen, magnesium, calcium and potassium in the dry matter. The study also includes the determination of the cooking value of tubers. One of the parts of the instrumental analysis was the determination of the texture properties of the tubers. Products of different size fractions of potatoes were produced and their sensorial qualities evaluated. The result of the study has confirmed that both weight grading and the variety have a decisive influence on the potato cooking value. The result of the experiments has also shown great variability in quality between the varieties. It has been confirmed that the chemical composition of the tuber sis also affected by their weight. During he experiments, there have also been produced the refined potato products, and the evaluation of their quality during storage has been performed.

In my thesis I was focused on the species spectrum of weeds in these crops – cabbage, pumpkins and potatoes. The observation was carried out in a company Zahradnictví Brabec located in Modřice, not far from Brno. I performed the evaluation on the basis of numerical method and statistics, using the ordination diagram to show the results. Most frequently in crops were Pigweed (Amaranthus retroflexus), Common lambsquarters (Chenopodium album) and Canada thistle (Cirsium arvense). These three weeds occured in all crops in large quantities. The most weeds were in pumpkin growthand the least weeds were in cabbage.

The aim of this thesis was to evaluate the starch and protien content in selected potato variarients in relation to nitrogen fertilization. The literature review is a general introduction to the given problem. In the year 2018, a one-year field trial was established where three starch yield varieties Anatori, Hermes a Ornella were observed. Nitrogen fertilizer was applied in two variants. The first variant was fertilized in the spring before planting with a dose of 73 kg N/ha, the second with a dose of 111 kg N/ha.In the experiment, tuber yield, average tuber weight, starch content, starch yield, dry matter content, and crude protein yield were evaluated. In the monitored year of 2018, which had above-average temperatures and on the contrary lowerprecipitation, the best evaluation was the application of higher nitrogen fertilizerswitha dose of 111 kg N/ha. Higher application of nitrogen fertilizers compared to lower dose increased potato tuber yield (t/ha), starch (%) and starch yield (t/ha).

This bachelor thesis deals with evaluation species spectrum of weeds in potato growth, determines differences between grounds and date of evaluation. Observation was made on a private farm in Hařilova Lhotka. There were Tripleurospermum inodorum, Echinochloa crus galli, Galeopsis tetrahit, Atriplex sagittata, Fallopia convolvulus, Thlaspi perfoliatum and Persicaria maculata on the ground Bažantnice. Fallopia convolvulus was the most numerous and Thlaspi perfoliatum was least represented. There were Lamium amplexicaule, Geranium pusillum, Galeopsis tetrahit, Atriplex sagittata, Solanum nigrum, Fallopia convolvulus, Thlaspi perfoliatum, Cirsium arvense, Euphorbia helioscopia and Elytrigia repens on the ground Za Cestou. Solanum nigrum was the most numerous. Euphorbia helioscopia and Thlaspi perfoliatum were least represented.

This thesis deals with the effectiveness of insecticides on Colorado potato beetle, which is one of the most serious pests that damages the above-ground part of the potato crop. Field trials were established in the years 2015-2017 at the campus of the Mendel University School in Žabčice. Insecticides from the group of neonicotinoids (Actara 25 WG, Biscaya 240 OD, Mospilan 20 SP and Monceren G) were used here. Insecticides from the group of pyrethroids (Vaztak Active, Nurelle D, Karate se Zeon 5 SC) and diamides (Coragen 20 SC) were used. Last but not least, two insecticides (NeemAzal T / S, SpinTor) have been applied that are useful in organic farming. In 2015 and 2017, the presence of Colorado potato beetle was evaluated before and after application of individual insecticides. Based on the occurrence of potato beetle larvae, efficiency was calculated. In addition, the difference between insecticides and insecticides and control was statistically evaluated. The year 2016 was not evaluated because of the low number of potato beetles.

This master thesis solves an overview of machine lines for growing and harvesting of potatoes that were used in the past and that are used currently. This thesis describes methods for storing potatoes in the company ZP Ostrov nad Oslavou, Inc. It assesses the damage of potatoes using different substrates on impact tubers on the loading area of the vehicle. Tuber damage is evaluated at intervals of storage time on potato. It also deals with assessing the damage to potato at various additions to percentage of field stone from various heights onto the pad. The thesis assesses also a potato growing economy for the last four years.

The objective of this bachelor thesis is to describe the logistic processes of the BROP company during its supplies of potatoes to the TESCO chain store in the Czech republic, Slovakia and Hungary. This bachelor thesis also answers the question whether the customer preferences differ in these three countries in terms of potato varieties.

The aim of this work is to compare of weed vegetation in stands of winter wheat and potatoes in the north-east area of the Znojmo. In the first part of my thesis I deal with the history of agriculture in the Czech Republic and the overall characteristics of the territory where the land is situated. Further I work with weeds with probable occurrence in monitored plants and methods for their control whether direct or indirect. At the end of this section I characterize the crop in which I watched the weeds. In the second part of my thesis I describe the results of my observation research. The graph shows the different species that occurred on the parcels. I compare their occurence in different periods of time and compare two different crops. I analysed the data also using of ordination diagrams and show which weeds were found often together. I present the differences between plant species in wheat and potatoes, as well as in different periods of the year.

The aim of the thesis was focused on assessing the significance of the impact of habitat on the occurrence of the common scab of potatoes. In this context, following factors were evaluated: degree and extent of infestation tubers with common scab, effect of the habitat, impact of the variety, vintage influence, the influence of fertilization with nitrogen and sulfur influence seed treatment, starch content, tuber yield, the proportion of tubers over 40 mm. The review of literature of thesis includes chapters regarding the origin of potato, potato and morphological characteristics of its growth, consumer potatoes and factors that affect the quality and yield. It mentions measures against diseases and pests. The last section is devoted to common scab of potato. The practical part deals with evaluating the impact of habitat on the incidence of common scab of potatoes. The attempt was based on the habitat with the occurrence of common scab and habitats without occurrence of common scab in Vyklantice. The results were processed in program Statistica, version 12.0. (StatSoft) function of multifactor and one-way analysis of variance (ANOVA). At the habitat with higher pH and KVK higher incidence of common scab was recorded. It confirmed the impact of resistance of variety on the incidence of common scab. It was not confirmed statistically significant dependence on fertilizer nitrogen fertilizer LAV and seed treatment tubers with Trichoderma strains. It confirmed a statistically significant dependence on the incidence of common scab on fertilization with SulfoGranulat.

The thesis is focused on the application of foliar fertilizers in the cultivation of potatoes. The evaluation was based on one-year small-plot trial plot, which manages Selekta Pacov. An attempt was based on a comparison of revenue, market share tuber size and number of tubers in a bunch of potatoes, which were fertilized solutions bitter mangnesium sulfate and urea. The results obtained in 2015 largely reflected the drought which occurred during potato vegetation. Of backed results showed that foliar fertilization influences crop, size of table potatoes and starch content.

Theoretical part of this bachelor thesis summarizes basic facts about breeding and fertilization of potato plant. In practical part there is evaluated effect of several fertilizers made of seaweed (AlgaSoil, Alga 300, SoftGuard, CaBoron, ProBoron, Rootmost) on yield of two varieties of potato with different length of growing season Arlet and Dicolora. Small-plot field trial was founded in April 2015 at experimental field station of Mendel University in Žabčice near Brno. Achieved results were affected by unfavorable weather, especially by drought at the beginning of tuberisation. There were not noticed any statistically significant influences of yield of any trial variant. There was small increase in yield (4 %) in case of Dicolora variety fertilized by AlgaSoil. So the achieved results have to be proved in coming years.

Yield and marketing characteristics of set of ware potatoes species were evaluated in this diploma thesis. Samples of potatoes, on which was the measurement executed, were forked out on the field in Košetice in Vysočina region. This region is typical potatoe area and has significant share on the national production of ware potatoes, starch potatoes and seed potatoes with different lenght of vegetation season. The inception of major phenological phase of growth, the quantity of plants on area, the quantity of stalks of a single plant and the overall appereance of growth were valuated in the vegetation process of individual species. The quantity of tubers on one plant, the quantity of tubers on one stalk and the average weight of one tuber were evaluated after the harvest. Then was defined the overall yield of tubers, the yield of marketing tubers and their overall revenue share. The appearence of tubers, their health condition and the amount of mechanical damage was discribed in detail for every species. The final results were processed to charts and graphs and they were statistically evaluated. The medium late and the semi-early species had achieved the best results for growing. The very early and the early species had lower yield and larger share of waste.

The main aim of this thesis was to evaluate the manifestation of certified seed and farm seed in selected varieties of potatoes. The experiment started in 2015 on the estate of Agricultural faculty of the University of South Bohemia. Four varieties (Magda, Adéla, Laura, Satina) with different vegetation period were planted. The certified seed was used in step A and the farm seed was divided according to size and it was tested for the presence of virus diseases. It was established 32 plots. The harvest of testing plots was on 29th September 2015. Each plot was harvested into the separate bag. Then the size sorting was done and individual tubers were counted. Based on measured values were determined the tuber yield, the yield of table potatoes, the content of the starch and the average weight per tuber. It was also observed the number of emerged plants of each variety and the number of stems per plant. The obtained results show that the use of farm seeds in the first year doesn´t have to mean an immediate decline in yield but varieties Magda, Adéla and Satine even increased their average yield about 9 t/ha. Only the yield of variety Laura was higher in certified seed by 4 t/ha. It wasn´t proved the impact of the chosen seed to the content of starch.

The aim of the study was to evaluate the effect of foliar nitrogen nutrition on yield and starch content and protein varieties of potatoes for starch with different length of the growing season. The literary review contains a general introduction to the topic and furthermore there is a summary of the existing development and production of potatoes both in the Czech Republic and abroad. In 2015 it was established one-year field experiment, where the effect was evaluated by 8% urea solution in variations in one application time and application in terms of solution 2 compared to the variant without the application of the urea solution. There were three sorts of potatoes with different vegetation period. It was a medium late variety Zuzanna and semi-late to late varieties Eurogrand and Eurostarch . At very specific 2015 to both precipitation and temperature be best evaluated albeit to a small extent, by the urea solution in the first term. Applications for the 2nd deadline had no significant effect on the production of starch and nitrogen compounds .

The aim of the experiment was to evaluate the effect of pig slurry applications in the growing crop of potatoes for industrial processing during the growing season. In 2015, he was at an altitude of 560 m based experiment, where the effect was evaluated by pig slurry at a variety Eurostarch experiment was divided into three variants, each variant had four repetitions, was a variant without application of slurry, 1 times applied manure and 2 times applied manure. For each experiment evaluated the proportion of emerged plants, tuber yield, starch content, average weight 1 tubers and the number of tubers in a bunch. In the reporting year and the effect of the application of manure. From the experimental results it is evident that the manure contributing to higher tuber yield, starch content and increased weight of tubers as the variant with one and two applications of slurry.

Diploma work was performed on a total of six lots in Vysočina County, where he measured the effect of the separation, the effect of weather and temperatures, and comparing technologies casing Rock removal of soil and techniques of planting and harvesting on quality, yield potato starch content and yield and mechanical damage of potato tubers. The aim of the thesis was to evaluate the effect of casing Rock removal of the content and starch yield and mechanical damage of potato tubers. Were evaluated three varieties of potatoes destined for processing into starch. Ornella varieties, Susan and Eurostarch. All three varieties were investigated on land záhonovým odkameněním without Rock removal. In the reporting year for all three varieties to odkameněných land has been greater yield of starch and up 2% and damage decreased by 20%. In parallel, it was found that the difference in tuber yield per hectare of the land is záhonovým odkameněním and land without casing Rock removal were influenced by variety.

The effects of foliage nutrition facilitate efficient and immediate supply of nutrient needs during the vegetation period. The objective of this thesis is to assess the effects of foliage application of magnesium sulfate and urea for potatoes, that are intended for processing into starch production. There were two sorts of potatoes with different vegetation period under study, an early variety called as Bernard and semi-late variety called as Ornella. The foliage fertilizers were applied in three different variants. In the first variant the sorts of potatoes were fertilized by solution of magnesium sulfate, in the second variant by solution of urea and in the third variant the solution of magnesium sulfate and urea was used. The assessment of the experiment consists of yield on tubers, contain of the starch, yield on starch, the average amount of tubers per tuft, the average weight of tubers and profitability of used foliage fertilizers. In the year under the study the increased yield on tubers and on starch was detected in all three used variants. Both sorts of potatoes showed the best results when the solution of bitter salt and urea was applied. The increased yield on starch was reached through the increased yield on tubers preserving the high contain of starch. The yield of starch increased by 8 % in the semi-late variety of potatoes Ornella. The early variety of potato Bernard showed the increase of yield on starch by 14%.

The aim was compare impact of NPK with the other types of fertilization: 0, N, PK, NK and NP on plants of chosen varieties. The experiment was treated on soil less convenient to intensive planting at an altitude of 400 m and conventionally

This thesis deals with yield and quality parameters of potato varietes. The experiment was based on three repetitions, and in a two-year cycle, in 2011and 2012 on the land of the breeding station VESPA Česká Bělá, Inc. - a subsidiary of VESA Velhartice, Inc. Eighteen chosen varietes of ware potatoes from the following categories were observed: very early (Impala, Magda, Monika, Suzan, Vera) early (Adéla, Barbora, Bohemia, Marabel, Terka, Vendula) semi - early (Bella, Lolita, Nancy, Red Anna, Vlasta) late (Janet, Lydia). Impala, Lolita and Marabel are varietes of outlandish origin. The evaluation was carried out after the harvest and was focused on tuber yield, average weight of a single tuber and mass grading of tubers in a clump, starch content and cooking quality.

The aim of my diploma thesis was to evaluate the effect of different doses of urea and UreaStabil fertilization on yield, tuber size and quality of potato tubers. A field experiment was carried out at the research station Valečov (Valkom Ltd.), the branch of the Potato Research Institute in Havlíčkův Brod during the years 2013 and 2014. Seven variants of fertilization were monitored in four repetitions of various doses of nitrogen fertilizer application as urea and UreaStabil and were compared to the unfertilized check variant. Two potato varieties, each with different lenght of the growing season, an early Karin and mid-early Red Anna, were used for comparison.

One important source of nutritive substances are potatoes. That is why potatoes are importatnt for human nourishment. They have a significant content of vitamin C, and therefore they have been used as a prevention of scurvy in the past. The aim of this work was to create an overview of the nutritionally relevant sunstances contained in potato tubers. There are also given information about the nutritional importance of potatoes, their material composition, and important substances. Among the important substances of potatoes there are included antioxidants, vitamins, starch and full proteins.

Thesis aims to evaluate the performance of certified and farming potato seed cultivars of Red Anna and Monika. Following aspects were evaluated: number of full-grown, tuber yield, the average number of tubers in a bunch, the average weight of tubers in a bunch, the average weight of one tuber and starch content. The experiment started in 2013 on the farm of Ing. Tomáš Dušička in Plasy. In the experiment there were used cultivars of Red Anna and Monika because of good reputation. Certified seed was used in reproduction level C2, farmer seed was gained in the same location. Tubers were planted on the 5th May 2013, using two row seed planter (row spacing 75cm and tuber distance 25cm). Tubers were planted in the height of 16cm. In the planted rows of field experiment there was marked area of 10m2 per repetition, which requires 45 full-grown bunches in the plot. Harvest of experimental plots was carried out manually since 15th to 17th September 2013. Each bunch was dug, then the total number of tubers in a bunch was counted. Finally, the whole bunch was weighted. Tubers were sorted into two categories by size using sieve (mesh size 40mm). Both categories were weighted. Study results reveal that in the first year of planting of own farm seed may not significantly affect the yield and starch content. In case of farm seed of Monika cultivar there was 12% increase in revenue and slightly higher yield of tubers for consumption.

My bachelor work is focused on utilitarian direction and changes in potato cultivation technology. The work is based on the available literature. Potato is a very important crop which is cultivated mostly for nutrition of the population. It is also cultivated as afood for folowing production of starch. The work processed 8 issues. It deals with history, describes different kinds of potatoes. It also deals with the particular utilitarian kinds of potatoes factors, causing new utilitarian trends creation in The Czech Republic. The following part is focused on technology changes in potato cultivation, as well as the role of a potato, of its usage and economy of growing of potatoes.

Comparison of technology without the use of soil preparation and screening technologies using the screening. In this work I examine the damage of potato tubers in the collection, the technologies used and the yield.

Susceptibility to three important pathogens causing potato skin diseases -- common scab, black scurf and silver scurf was studied in chosen varieties grown in the Czech Republic. The results were obtained in terms of severity and incidence of evaluated diseases for each variety and each year. The results made also possible to evaluate interactions of factors variety, earliness and year, mutual relationship among pathogens and secondary effect on presence of observed diseases, when the plants were treated with fungicides against late blight. None of varieties was resistant to observed diseases. The variety Mozart had the lowest average incidence of common scab, the variety Agria had this incidence the highest. The lowest incidence of black scurf was recorded for the variety Rosara, the highest for the variety Rebel. Belana was the best variety evaluated in the infestation of silver scurf, the worst was the variety Berber. The silver scurf caused by Helmithosporium solani was the disease with the highest incidence and also the highest severity of infestation of potato tubers what is unsuitable when the tubers are used for washing.

The focus of the dissertation thesis called "The use of urea with urease inhibitor in the fertilisation of potatoes" was on the effect of nitrogenous fertilisation with urea and urea with urease inhibitor NBPT (urea stabil) on changes in the content of Nmin in the soil and in nutrients available post-harvest, tuber yields, starch content, macro-elements N, P, K, Ca, Mg and Cd in tubers and tops, content of essential and non-essential amino acids in tubers. To complete the experiment we established a pot trial without the plant where we monitored in regular intervals for 24 days the effect of urea, urea with urease inhibitor (urea stabil) and ammonium nitrate with limestone on changes of the content of Nmin and on the individual forms of nitrogen in the soil. The field trial was conducted at the School Farm in Žabčice (south Moravia; maize-growing region) with potato varieties Karin and Red Anna. The trial involved 7 fertilisation treatments: 1) 100 % urea; 2) 80 % urea; 3) 60 % urea; 4) 100 % urea stabil; 5) 80 % urea stabil; 6) 60 % urea stabil; 7) unfertilised mineral treatment (control). A pot trial was established in the laboratory of Mendel University in Brno using 4 treatments of fertilisation: 1) unfertilised (control); 2) ammonium nitrate with limestone - LAV; 3) urea; 4) urea stabil.

In this thesis, the effects of year, variety and size of seed tubers on yield and quality of potato tubers were evaluated. In the two years (2011 and 2012), four potato varieties (Velox, Marabel, Adéla and Laura) were used. Size of seed tubers for all varieties was split into three size fractions: A < 35 mm, B 35-60 mm and C > 60 mm. In both years of observation were monitored following parameters: total and marketable yield, average number of stems per plant, number of tubers per plant, number of tubers per stem, the average weight of tuber, proportion of tuber size in harvested tubers, content of dry matter and starch in tubers fresh matter. Year contributed most to the total variability in total and market tuber yield (51.2%. And 54.4%, respectively). Size of seed tubers showed the highest proportion in the total variability of number of stems per plant (94.7%). Declared cooking type in all evaluated varieties was kept. Table value was significantly affected only by variety.

The bachelor thesis is focused on effect of enzyme hydrolysis on solubility and antioxidative properties of potato protein. It was used industrial potato fruit juice and potato fruit juice from tubers two varieties Sibu and Ornella. Isolates derived from heat coagulation are generally poorly soluble so their use is limited (only feeding purporses). This work describes positive effect of enzyme hydrolysis on solubility and antioxidative properties of potato protein isolates. For example, antioxidative activity of soluble isolates was 99 mg of L - ascorbis acic per mg grifts. The highest share of soluble isolates was found at cleaved of enzyme alkalasa

The aim of the experiment was to evaluate the reaction of chosen potato varieties to the application of leaf fertilizers. The speed of their action and, together with combination with other interventions (common application with fungicides), and also the economics of their application belong among the advantage of leaf fertilizer application. In 2012 and 2013 there was an experiment established in 380 m above the sea level. In this experiment the effect of application of urea solution, Lignohumate, and Energen Fructus was evaluated in the varieties with a different length of vegetation period Magda very early, Adéla - early, Laura and Satina semi early and Bionta - late. The rate of sprouted plants, the yield of tubers, the proportion of tubers of consumer size, the number of tubers under cluster, an average weight of one tuber, the number of stems per a plant, and the content of starch were evaluated in these plants. It was found out from the results that in 2012 Magda and Satina varieties reacted with an increased average weight of one tuber after the application of all leaf fertilizers. The effect of Lignohumate was the most positive in this year; it increased an average weight of one tuber in Magda, Adéla, and Satina varieties. In comparison to that, in the second year of the experiment there was a positive reaction to additional fertilizing with Lignohumate, Urea, and Energen Fructus, leading to the increase of an average weight of one tuber in Magda, Adéla, Laura, and Bionta varieties. In 2013 there was the highest influence on an average weight of one tuber caused by the use of Urea, namely in Magda, Adéla, Laura, and Bionta varieties.

Damages, which weeds caused annually are difficult to quantify and its negative influence manifests annually in all crops and all fields.Chemical weed control is presently considered an important method for controlling weeds. The essence of chemical pest weeds consists in the use of herbicides to reduce weed species population under the economic threshold of harmfulness. In an effort to control weed populations using three methods: mechanical, chemical and biological. In the thesis was mapped weeds in potatoes on private land in Plasná, district of Jindřichův Hradec in region of South Bohemia. In the practical part of this thesis, I conducted an experiment that was aimed at monitoring the effects of selected herbicides in crops of potatoes. The aim of the experiment was to verify the effects of herbicides on the population most frequently occurring weeds in the root crops. The results showed that the herbicide is more effective for preemergence weed monitored. Assessment of weed infestation was carried out numerical method (ANOVA, Tukey = 0,05) in the ARM 8 (GyllingDataManage ment, Inc.) Spring 2013 - Fall 2013.

My measurement was performed on totally six fields here in the Czech republic, where I measured soil characteristics, size of seed, weathering and comparison of different technologies and techniques of separating soil seed and harvest quality, damage and yield of potatoes.

The objective of this thesis was to assess the potato varieties produced by ecological and conventional farming, to find out the deviations of cooking types and to establish the cooking quality of the tubers The cooking quality of potatoes was established subjectively, based on sensory analysis. The individual characteristics of the cooking quality which were assessed included the colour of flesh, consistency, texture, flouriness, moisture, taste, and tuber darkening after cooking. The results suggest that the characteristics of the cooking quality depend mostly on the variety. The year of growth and the ways of farming also form a minor influence. The deviations of the actual cooking type of the assessed varieties from the declared cooking type were established according to the method of the Czech Agriculture and Food Inspection Authority. The results of the assessed varieties show that the cooking type was not affected; minor differences were caused by the year of growth.

The aim of the present diploma thesis is to widen knowledge of the chemical regulation of weeds in row crops. To establish the effectiveness of herbicides, we set up a small lot at a carefully chosen spot in the potato-growing region near Strakonice. We conducted a comparison of the effects of three herbicide combinations on two potato varieties (Red Anna, Laura). Two combinations proved pre-emergent (Afalon 45 SC+Command 36 SC; Sencor 70 WG+Command 36 SC), one post-emergent (Titus 25 WG). Subsequently, we evaluated economic costs on weeds regulation and suggested preliminary measures to be taken.

This thesis deals with a reactions of potato variety Princess at different levels of fertilization. The aim was to compare the effect of alone nitrogen and its combination with phosphorus and potassium on tuber yield and its composition, dry matter content and starch.

The thesis examined the effect of seed tuber size on the structure of the potato yield. In the one year trial ( 2011) four varieties were applied (Velox, Marabel, Adela, Laura) have been grown in the conventional system. The size of seed tubers were divided into three size fractions: A < 35 mm, B 35 to 60 mm and C > 60 mm. Number of plants per area and number of stems per plant were observed during the vegetation period. The number of tubers per stem and average weight per tuber were determined after harvest. Furthermore was also found total and market yield of tubers. The size of seed tubers most significantly influenced the number of stems per plant (of 93.9%) and the number of tubers per stem (of 80.5%). The resulting parameter values were highly influenced by the course of weather in 2011.