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Influence of cultivar and hot water treatment on development of choosen pathogens of onion
Skoumalová, Tereza ; Koudela, Martin (advisor) ; Čeněk, Čeněk (referee)
The target of the work was verificated the varietal differences in varietal resistance onion Allium cepa L. to pathogens onion neck rot Botrytis aclada and pathogens mildew onion Peronospora destructor and verificated the effect of the seed treatment with hot water to reduce choosen pathogens of onion neck rot Botrytis aclada and mildew onion Peronospora destructor.
Seed were sown to bowls with sand and destilled water. Bowls were place in growth chambers. For experiments with varietal resistance were used cultivar onion: Alice, Amfora F1, Avalon, Bolero F1, Grenada, Karmen, Tosca, Triumf F1 and Všetana. For experiments with hot watre treatment were used cultivar onion: Alice, Amfora F1, Unico F1 and Tandem. Growth chambre had ideal climate by method firm Moravoseed s. r. o. and seed germination was evaluented by method ISTA International Seed Testing Association. Experiments were evalueter by modified method by Pawelec et al. (2006).
The results demonstrated the exists between coultivar differences the resistence onion to selected pathogens. The most resistence cultivar onion were Bolero F1, Karmen, Všetana and Triumf F1 againts the pathogens onion neck rot Botrytis aclada and cultivar onion Alice, Avalon, Bolero F1 and Tosca againts the pathogens mildew onion Peronospora destructor.
The result demonstrated the effect of seed treatment with hot water to select pathogens hadn´t signification efect. Hot water treatment about 50 °C for 20 minuts for seeds onion can´t reduce infect onion neck rot Botrytis aclada and infect mildew onion Peronospora destructor.
For cultivar onion Amfora F1 was observed treatment effect, but results were inconclusive.
Growing varieties with better resistence to the phytopathogenic fungy, could be after verifying higher resistence in multi-experiment, important preventive tool for regulating presence of such diseases when growing onions.
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Evaluation of cultivars tolerance of chosen vegetable assortment to fungal diseases
Maláková, Dana ; Koudela, Martin (advisor) ; Kristína, Kristína (referee)
The aim of this Diploma thesis was to assess the cultivar tolerance of a chosen assortment of butterhead lettuce, leaf lettuce, iceberg lettuce and cabbage to fungal pathogens (Bremia lactucae, Fusarium oxysporum f. sp. conglutinans).
The experiment was conducted in the laboratory conditions of the gardening department FAPPZ of the Czech University of Agriculture in growth chambers. The lettuce experiments were done in given conditions with the temperatures of 18 - 20 °C under the regime 12 hrs. of light and 12 hrs. of darkness. The cabbage experiments were conducted in given conditions under the regime 12 hrs. of light and 12 hrs. of darkness with the temperatures of 14 °C during the day and 12 °C in the night. The lettuce plants were planted in dishes on fine sand. All experiments had infected and control variants. After emergence, the experimental plants were inoculated with variants of the selected pathogen. The plants were observed in 2 - 3 day intervals throughout the whole experiment. The experiment was assessed using the modified standard method according to Pawelec et al. (2006). A modified method with a percentage scale was used to assess the lettuce experiments. Cabbage experiments were evaluated with a scale of points ranging from 0 to 9 according to the percentage of infection on the plants. The results of the methodology were determined using the program Statistica 12.
In the experiments evaluating the variety tolerance of a chosen assortment leaf lettuce and iceberg lettuce to the pathogen Bremia lactucae Bl:31, a statistically significant difference in the sensitivity to this pathogen was established. The results show that the most resistant varieties are Tarzan, Stamir, Adinal a Verala. The greatest sensitivity to the pathogen Bl:31 has a variety "Dětenická Atrakce" then Traper and Nikolaj. Effect of seed treatment with hot water (HWT) to suppress pathogen B. lactucae was statistically significant in the varieties "Dětenická Atrakce" (10% decrease) and Dubáček (7% decrease) compared with untreated infectious variant with HWT. In the sensitivity evaluation of varieties and lines of white cabbage was a statistically significant difference in infecting of pathogen Fusarium oxysporum f. Sp. conglutinans breed 1. The most significantly susceptible to the pathogen Foc was variety Pourovo late-season (degree of assault after inoculation was 6.52 points).
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Evaulation of selected garlic assortment
Dvořák, Jakub ; Koudela, Martin (advisor) ; Jelínek, Tomáš (referee)
Field experiment was established for this bachelor thesis, for which was choosed nine species of Czech garlic. Five of them is bolting species and three are not bolting. All species was grown in three systems of production, which were various of amout of fertilizers. In conventional system there were used full dose of fertilizers and cloves were macerated in sulphur and in Rovral Aquaflo. In second system of production which is called integrated system of vegetable production, there were used a half dose of fertilizers and cloves were not macerated. In the last one which is called organic, there were not use any fertilizer and cloves were not macerated. The dose of fertilizers were split to three parts which two of them were apply in autumn before planting and the last one were apply in the spring. When plants started bud, every week were young plants measured. After harvest, all bulbs were measure for weight and width and after that were analysed for oils in Departement of quality of agricultural products and used for experiment with storage. In this experiment, bulbs were in the room where is constant temeprature and humidity and every month were controled. For analysis of oils, cloves were mixed and distill. Distiled oils were analysed in gas chromatograph. Data from all experiments were processed in computer program Statistica 12. Results show that the non bolting species bud earlier than bolting species, the higest yield have species from in integrated system of vegetable production. The best health of bulbs during storage experiment have bulbs from conventional system of production except of species Matin which have the best storage quality in integrated system of vegetable production. The highest amount of oils have bulb from conventional system of production except of species Unikát and Benátčan which has highest amounts of oils in bulbs from organic production. Species Benátčan have the smallest amount of measured oils componets.
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Efficiency Improvement Proposal of Machining Process of Cylinder Component for Oil Wells
Koudela, Michal ; Sliwková, Petra (referee) ; Sedlák, Josef (advisor)
This diploma thesis is concerned with a proposal for increasing the efficiency of machining when manufacturing an inner sleeve at the company Sanborn a.s. In the diploma thesis, the technology used for machining itself is first briefly described, followed by a description of the original production technology including a description of machine and hand tools used and cutting conditions. The next part of the paper describes the proposal for increasing the efficiency of machining operations. The proposal includes a description of the suggested solution that will lead to increased efficiency, a machine proposed for the specific operation, appropriate tools and proposed cutting conditions. The benefits of implementing the proposal are also described here, both in terms of saving unit time, and in terms of the machining technology itself, where, for example, the formation of chips is improved, the inner tension of machined components reduced, etc. The diploma thesis further includes a technical-economic evaluation assessing the economic benefits of the changes introduced.
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Welding characteristic of source Omicron Gama 160
Koudela, Michal ; Hála, Michal (referee) ; Kubíček, Jaroslav (advisor)
This bachelor’s thesis deals with the welding properties of the Omicron Gama 160 inverter power supply. The thesis is divided into the theoretical and the experimental parts; the theoretical part deals with the electric arc and the division and description of welding power supplies, especially the Omicron Gama 160. In addition it describes the issues of the selection of suitable electrode and welding parameters and the definitions of the most frequent welding defects including the procedures to prevent them. The second part consists of the experimental verification of the suitable electrode and welding parameters selection. On the basis of the experiment there were elaborated the welding procedure specifications (WPS). The experiment verified that the Omicron Gama 160 power supply is a machine with good price/performance ratio, suitable e. g. for assembly and welding works in a home workshop.
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