National Repository of Grey Literature 11 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Three the most cultivated legumes in the Czech Republic with soil conservation technologies
Koukolíček, Jan ; Pulkrábek, Josef (advisor) ; Milan, Milan (referee)
The experiment which was done on the fields of Cooperative farm in Nečín should verify three soil conservation technologies with three most cultivated legumes in the Czech Republic. We tested deep cultivation, shallow tillage and no--tillage technology. And we used winter pea which was seeded in two terms in the autumn and in the spring. Spring pea, narrow- leafed lupin, white lupin and soya were seeded only in the spring term. We tested soil density and soil moisture with different soil conservation technologies. We observed vegetation stages and we made pre--harvest and post--harvest evaluation.
Establishment of corn crop stands by soil protection technology on land fealds withs slightly soil erosion condition
Herout, Marcel ; Pulkrábek, Josef (advisor)
The work is based on the needs of farmers who grow corn for cattle feed and biogas plant. For many farms corn is a strategic crop. But i tis also an erosion crop and therefore it is necessary to pay attention the erosion. The experiment is set in terms of ZD Krasna Hora nad Vltavou. The firm manages on mildly and severely threatened soil by erosion and there comes a potential problem with water soil erosion too. It is tested 3 soil conservation technologies with different spreads rows and different crop density. It is monitored the effectiveness of various anti-erosion technologies, stand density and row spacing. Measurement is managed by Research Institute of Soil and Water Conservation. The yield of individual parcels was evaluated. The biomass yield and grain were determined.
Production yield of sorghum grown for biogas production
Adamčík, Jiří ; Pulkrábek, Josef (advisor) ; Vladimír, Vladimír (referee)
Low temperature during germination is a major limiting factor affecting growth of sugar sorghum in the Czech Republic. The aim of the study was to determine the ability of stimulated seeds germinate in slightly adverse conditions (less optimal temperatures) and evaluate the impact of biologically active compounds to faster germination of sorghum seeds and next plant growth. Two sorghum seed lots were treated by auxinous preparations Lexin and M Sunagreen. Germination was tested in germination chamber at temperatures 12, 15, 18 and 21 °C in the dark for 14 days. The results confirm stimulation of sugar sorghum seeds and increase of the germination speed at lower temperatures. Top acting biologically active agent (for faster germination) was Lexin. This product has a significant impact on increasing of the seed vigour. In less favorable conditions (12 ° C) application of Lexin increase germination speed of sorghum seeds by a full five days. Shortening of mean germination time was detected after M-Sunagreen application too. 25 cm row spacing on sorghum sugar and 50 cm on the grain sorghum were the best in our experiments. We have found that fertilizer Urea Stabil before sowing at a dose of 80 kg N.ha1 and then the same dose fertilization in stage BBCH 35 is preferred.
Precision sowing and the establishment of grain crops
Brinar, Jan ; Pulkrábek, Josef (advisor) ; Koukolíček, Jan (referee)
The object of the study was to compare the classical method of planting (small-plot complete seeder) and precise seeding for a given distance (prototype seed sowing machine FARMET for sowing with fertilizer under the heel) for winter wheat. Chosen were various seeding rates for precision and classic sowing machine into the cereals. Tested were sowing rates from 1.0 to 4.5 MKS. The experiment was done in the period 2014,2015 at the research station CUA in Prague-Uhříněves. The chosen variety was forage winter wheat Penalty quality C from PROBIO of 2014. For the basis of the hypothesis was selected seed rate of 2.0 MKS in precision sowing against 3.5 MKS in a classical way of sowing. The goal was to determine whether the reduced seed rate during sowing precise manner provides the same yield as a recommended seed rate of a traditional methods of seeding. The forecrop was a spring barley. Soil was prepared using the minimize blade cultivator before sowing of the wheat. Some variants of the experiments were fertilized at planting to promote germination. These variants were fertilized with 150 kg N / ha freely to the soil before sowing or 150 kg N / ha under the heel when sowing fertilizer Nitrophoska perfect. Furthermore, all plots were fertilized with 140 kg N / ha in three divided doses in a LAD 27, without distinction. Dry summer in 2015 hadn´t a devastating effect on wheat and most variants of the experiment gave a very good yield. The assumption that there will be savings precision sowing seed while preserving the yield was confirmed. Additionally it was shown that precise sowing on average in all variants seeding rates, fertilized before sowing or not surpassed yields of classic seeder.
The new LPIS evidence and its link to subsidy programmes
Koniaríková, Kateřina ; Pulkrábek, Josef (advisor) ; Jiří, Jiří (referee)
The Czech Republic, as well as the other EU states, has commited to the setting of the system for the evidence of the agricultural used land. In 2014, there was a new modul LPIS (Land parcel identification system) established, which is being used as the information service for farmers. They can find here the needed datas about the utilized agricultural land, but this system is also used for the data control that are being set in the application form for the subsidies from Europien funds. In my thesis I summarised concisely the development of the Common agicultural politics including the news for the following subsidy period. In the chapters I paid the attention to the Programme for the rural development and its new setting for the period 2014-2020. But primaly, I focused on the LPIS land evidence, the reason of its setting and on the benefits to the farmers and the governemt. There is also the special chapter about the changes in LPIS evidence after 2015. My intention is to show the users the news, which they can meet during their work with the land evidence and with the application forms for the subsidies. The aim of this thesis is to evaluace the ability of the chosen agricultural subject to orientate and to work with the new version of LPIS evidence. I established the cooperation with the State Agricultural Intervention Fund to gain the practical information about the LPIS application. I also asked for the cooperation the agricultural subject Havlíčkova Borová, zemědělská a.s., that farms in the region Havlíčkův Brod. I asked them for the access to their LPIS datas. I also tried to evaluace the fact, how the subject is able to prepare the underlays and how the subject proceeds the United application form for the agricultural subsidies. In the end of this thesis I summarised the statistics of the applied United application forms during 2015 in the region Havlíčkův Brod. I gained these datas from OPLŽ employees. This statistics contains the datas regarding the number of the agricultural subjects that managed to prepare the application form for the agricultural subsidies by themselves and also the information, how many subjects used the services of the agricultural consultants or the services of SZIF employees, Department of the LPIS and request receiving (OPŽL). There is also information being involved in this thesis, what measures the farmers applied for in the frame of subsidies.
Evaluating new aromatic hop genotypes
Henychová, Alena ; Pulkrábek, Josef (advisor) ; Jaroslav, Jaroslav (referee)
Hop growers request new cultivar should have qualitative parameters of Saaz semi-early red-bine hop with higher yield potential. Therefore currently, there are efforts to breed new aroma cultivars. The aim of diploma thesis was to evaluate and choose new breeding aroma genotypes, which would show equal or better quality and quantity parameters than Saaz semi-early red-bine hop registered cultivar, based on production indicators, chemical and genetic analyses. Obtained data were evaluated by basic statistical characteristics, two-sided t-tests for independent selections and correlation analysis. A yield is the most important quantitative parameter, which is mainly and significantly dependent on climatic conditions. All evaluated genotypes in diploma thesis have reached higher average yields than ŽPČ cultivar, except genotype 4799. Genotype 4801 reached the highest theoretical yield (2.2 tons of dry hops) in year 2014 and genotype 4975 (1.77 tons of dry hops) in year 2015 from achieved results. A content of alpha bitter acids is the most important qualitative parameter. All aroma new breeding lines have shown parameters of fine aroma hops according to chemical analyses of hop resins. Aroma genotype 4975 showed the highest average contents of alpha and beta bitter acids, balanced ratio between alpha and beta bitter acids, the lowest contents of cohumulone and colupulone, and as well it kept a low or middle variability in all studied traits of chemical analyses of hop resins. A relative content of farnesene higher than 12% is a typical for aroma hop cultivars with ŽPČ cultivar origin. All evaluated genotypes achieved this criteria. We evaluated the relationship to Saaz semi-early red-bine hop cultivar based on genetic analyses. Genotype 4799 has been genetically the closest to ŽPČ. Brewed beers have been a same quality as beers from Saaz semi-early red-bine hop cultivar by sensory evaluation.
The influence of enzymes applied on processed sugar beet bulbs on the quality of saturated juice
Langrová, Petra ; Pulkrábek, Josef (advisor) ; Ilona, Ilona (referee)
The thesis focuses on the determination of dextran presence and its potential amount in sugar made semi-products. Dextran is a polysaccharide which is created on a sugar beet tuber due to inappropriate storing, because of low temperatures or wound of beet tissue, which is subsequently prone to infections caused by Leuconostoc mesenteroides microorganism. The infection results in creation of polysaccharides and other secondary products which have a negative influence on technological processing of beet. Levan and dextran create the highest amount of these polysaccharides in sugar beet. They significantly increase the viscosity of sugar juice. It is subsequently seen on crystallization of calcium carbonate during the second saturation and this causes the deterioration of filterability. In case of dextran or other polysaccharides presence other problems arise in the technological process of sugar production. For its elimination enzymatic hydrolysis is used with the aid of dextranase or alfa amylase. This element splits dextran polysaccharide into smaller oligosaccharids which are not caught in filtration device and therefore do not cause reduction in production capacity. Commercially accessible dextranase; however, is financially demanding so that there are researches trying to find more economical ways. This diploma thesis evaluates the presence of dextran in extracted juice by means of ICUMSA GS8-19 (year 2009). The method evaluates the presence of dextran in diffused, heavy and II. saturated juice. The research was focused on determination of alkalinity, pH, sedimentation and filtration coefficient, polarization, sugar content and purity. The aim of this thesis is to evaluate the correlation between recorded numbers and the application of the two enzymes which are used for removal of these problems. After completion of the experiment and evaluation of measured results in operating laboratory of sugar factory Tereos TTD Dobrovice, connection among laboratory measured data was not proved. Our recorded data did not prove reciprocal relation. The only proved connection was about number of rinsed filters (per day) after II. saturation and amount of used enzymes. The amount of enzymes influences how many times per day filters must be rinsed in order to get rid of deposit. In case of high amount of dextran, filters started to be clogged by impervious layer of molecules and in case that enzymatic way was not used for elimination of this saccharide, the only solution was frequent filters rinsing or reduction in working capacity connected to subsequent prolongation of processing campaign. Further, we proved the efficiency of alfa amylase which was used during beet processing (after New Year). This enzyme had the same impact on elimination of polysaccharides and clearance of filters. It is to say that in following campaigns it is possible to substitute financially demanding enzyme for cheaper alfa amylase.
Influence of soil compaction on production parameters of sugar beet
Balák, František ; Pulkrábek, Josef (advisor) ; Milan, Milan (referee)
The methods of autumn tillage in sugar beet are still oriented mainly on classic cultivation, which is based on ploughing. Minimalization methods have recently appeared in sugar beet as well, mainly due to their anti-erosion effect. This thesis deals with question, whether is the minimalization tillage able to match classic cultivation in its positive effect on soil fertility. To compare the effect, penetration resistance has been measured, as it serves as an indicator of field compaction, which should be alleviated by autumn tillage. Aim of this thesis is to measure the effect of soil compaction on soil cultivated by ploughing or deep chiseling in a particular area of sugar beet and to assess the impact of soil compaction on its production. Research has taken place in semi-practice experiments in fields in the vicinity of Jičín in years from 2012 to 2015. Measured field parameters were soil penetration resistance and soil wetness. Rated parts of vegetation have been manually harvested in technological maturity and from sampled tubers has been determined yield, sugar content and other quality parameters. Tested fields were medium compacted, penetration resistance to 40 cm was in average between 3 to 4 MPa, depending on tillage quality and on sampling date. Ploughing and deep chiseling managed to provably alleviate soil compaction and thus considerably helped to setup sugar beet vegetation well. Yield and qualityparameters were very good, yield of tubers reached in average 95 t.ha-1 and the sugar content 18,7 %. Yield of polarization sugar reached in average 17,8 t.ha-1. As the research has shown, autumn tillage by deep chiseling is in its soil loosening effect comparable with ploughing and even exceeds it a little in its influence on vegetation quality. Good autumn tillage raises values of all yield factors and quality parameters. Between basic parameters of yields were found no statistically significant differences for the two autumn tillage methods. In the yield of polarization sugar per hectare was found a statistically significant difference of 1,5 % for the benefit of deep chiseling.
Utilization of predatory mite Typhlodromus pyri Scheuten within IPM and organic hop growing
Nesvadba, David ; Pulkrábek, Josef (advisor) ; Kamil, Kamil (referee)
The objective of my work was to evaluate the efficiency of a native species of predatory mite Typhlodromus pyri Scheuten against two-spotted spider mite (Tetranychus urticae Koch) within IPM and organic hop growing and to find out if hop protection against T. urticae with the help of T. pyri can replace conventional hop protection based on miticides and if it can be profitable. The trials were carried out since 2011 till 2015 in three hop gardens at a research farm Stekník, which belongs to Hop Research Institute in Žatec (Saaz). The first experimental hop garden, where IPM is practiced, is called Černice I. The other one BIO is, as the name says, under organic regime. The third one called Kaplička (Little Chapel) I., served as a reference one because hop is grown there under a common conventional system with the use of miticides to control T. urticae. In regular intervals since the time when the first spider mites were observed at hop leaves till the harvest fifty leaves were sampled (17 from lower, 17 from middle and 16 from upper parts of hop plants) in the hop garden with IPM regime and in the organic hop garden. Population densities of eggs, mobile stages of T. urticae and T. pyri were assessed together with nymphs of predatory Thrips of the genus Aeolothrips, which occurred there naturally as the dominant native acarophagous predators. The results were statistically evaluated with the help of correlation analyses and t-test for independent groups. Efficiency of T. pyri and economical comparison with chemical protection were made as well. It is possible to conclude that after release of predatory mites and under using of selective pesticides the biodiversity is higher. Hop protection against two-spotted spider mite with the help of T. pyri can be profitable and it can replace chemical protection against this dangerous pest for many years. T. pyri is commonly more efficient if population density of T. urticae is lower. The tightest dependence at the level of 90% was statistically confirmed between occurrence of T. urticae eggs and its mobile stages. Statistically important difference was found out between the two different types of hop growing in the most of the cases.
Evaluation of creation of yield parameters of Kazbek and Saaz Late cultivars
Štefanová, Lucie ; Pulkrábek, Josef (advisor) ; Jaroslav, Jaroslav (referee)
Hops has been grown in Saaz region for 700 years. The first written mention about local hop garden comes from 1348, but it is certain that the hop gardens were owned by brewers and church dignitaries even earlier. First, hops was grown on the monastery grounds on a large scale. Czech, and thus Saaz hops, reached its peak in the 19th century, mainly for its fragrance, color and kontent of lupulin, and became a benchmark for determining the quality and price of hops. Kazbek is the first variety of "flavour hops" bred in the Czech Republic. Its unique sensory properties were examined with numerous brewing tests in several breweries of different sizes. Breeding of "flavour hops" is a real challenge for hop breeders. The first hop in that category, for example Citra, Amarillo, Simcoe, Bravo, were bred in the United States. Variety Kazbek was obtained by selecting progeny of the hybrid material, which has origins in Russian wild hops. It was registered in 2008 due to high stability and efficiency. Robustness and stability is expressed in the name of the variety, because Kazbek is the highest mountain of the middle Caucasus. From the brewing point of view, it belongs among the bitter types. Saaz Late variety was obtained by selecting F1 offspring of parental combination of unfinished breeding material that is the origin of Saaz. It has a charakter of late variety. Saaz Late is an aromatic variety for the second and third hopping. Aroma is genuine, fine, hoppy. The most important quality aspect of hops is alpha acids content. Content of alpha acids has been reagularly assessed since 1981. The evaluation results show, that the alpha acids kontent in varieties Saaz Late and Kazbek is proven statistically different. Selection of suitable location is the key element for cultivation of hybrid varieties. It is very important to focus on the evaluation of natural conditions of each location. This paper shows that there is no statistically significant difference between locations Stekník and Blšany. Optimal temperature for growth and subsequent yield formation should not drop below +7 °C in April, +11 °C in May and from June to August should range between +15 and +18 °C. The stability and balance of temperature is also important. Precipitation has a bigger 7 impact on yield formation than temperature. This statement was confirmed in 2015, when tropical temperatures and drought during the flowering and cone formation caused significant decrease of yield. Low yield level

National Repository of Grey Literature : 11 records found   1 - 10next  jump to record:
See also: similar author names
1 Pulkrábek, J.
2 Pulkrábek, Jan
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