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Results 1381 to 1410 of 1506:

Hodnocení dlouhodobých bilancí organických látek a jejich vztahy k obsahu organického C v půdách na okrese Ústí nad Orlicí

Jiří Dostál, Dana Cerhanová, Lenka Hajzlerová, Jana Martincová, Petra Pospíšilová, Eduard Pokorný, Tomáš Lošák

Acta Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(2), 13-24 | DOI: 10.11118/actaun200957020013

Organic matter balance in the farms located in Ústí nad Orlicí district has been investigated since 1979. As a result, so called need of organic fertilisation, has been determined and the supply of the organic fertilisers to soils, e.g. farmyard manure, slurries and also straw and green manure has been monitored over the whole time period. About 45 % of the arable land area in the district has been monitored.
In addition to the organic matter balance, we determined several soil organic matter characteristics in soil samples (organic C, N and S contents, inert and decomposable C content, hot water soluble C content, hydrophobicity index calculated from the DRIFT spectrometry, available P, K, Ca and Mg contents and pH).
The relationships between the organic matter supply with supplemental sources organic fertilisers and all the selected soil organic matter characteristics were statistically significant. Significant correlations were also found for the relationships between the organic matter need and all the selected soil organic matter characteristics.

Odezva bramborových hlíz na rázové zatěžování

Šárka Nedomová

Acta Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(4), 63-72 | DOI: 10.11118/actaun200957040063

The response of tubers of nine varieties of potatoes to the bar impact have been evaluated. The proposed method enables to obtain force - time record. The response function is represented by the time history of the surface displacement. This function has been recorded using laser vibrometer technique. The main features of the force and displacement function have been found both in the time and frequency domain. It has been found that given method can be used for the detection of the potato tubers damage origin as well as for the differentiation among different varieties of the potatoes. There is also a chance to evaluate the main mechanical characteristics of the potato tubers by non - destructive way.

ANALÝZA SÍLY VYBRANÝCH KLASICKÝCH A ROBUSTNÍCH TESTŮ NORMALITY PROTI BIMODÁLNÍMU ROZDĚLENÍ

Luboš Střelec

Acta Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(6), 253-260 | DOI: 10.11118/actaun200957060253

The aim of this paper is to compare the power of selected normality tests to detect a bimodal distribution. We use some classical normality tests (the Shapiro-Wilk test, the Lilliefors test, the Anderson-Darling test, the classical Jarque-Bera test and the Jarque-Bera-Urzua test), some robust normality tests (the robust Jarque-Bera test and the Medcouple test) and the modified Jarque-Bera tests, where the median instead of the mean is used in the classical Jarque-Bera test statistic. The results of simulation study show that the Anderson-Darling and the Shapiro-Wilk tests outperform the others, especially in small sample sizes. On the other hand the classical Jarque-Bera, the Jarque-Bera-Urzua and robust Jarque-Bera tests are biased, especially in small sample sizes again. Finally, the modification of the Jarque-Bera test leads to increase of power against bimodal distribution.

PŘÍSPĚVEK K ANALÝZE DEVELOPERSKÉHO TRHU V ČESKÉ REPUBLICE

Martina Procházková, Jana Turčínková

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(6), 113-122 | DOI: 10.11118/actaun200856060113

Czech economy went through a substantial transformation in last two decades affecting business environments of all fields. This paper presents partial results of the Czech development market analysis. It explains the characteristics of real-estate development, real-estate development market and the complexity of the real-estate development process, including market research, site selection (using feasibility analysis), due diligence, property acquisition, project design, obtaining entitlements, financing, construction, lease-up or sale or operation, if the project is retained as and asset.
The significant growth in last decade of the analyzed market is slowing down due to current greater circumspection of banks when providing credits for new development projects, drop of real property prices in Western Europe and at the same time greater revenues from real properties in Eastern Europe. The inhibition of the investment in commercial real property (both what number of transactions concerns, and total volume of investment) is influenced by so-called mortgage crisis on the U. S. and British real estate market. In Czech market, the factors are reflected in a number of respects.
The paper suggests future steps of the intended research, focus on identification of factors affecting decision-making process when preparing real-estate development project, finding interrelationships among these factors, quantification and setting weight of the factors, creation of a decision-making process model and its test on a real case. The model should contribute to decrease waste of time and money investment in these feasibility calculations by providing a tool which helps pre-select projects with higher chance of success in earlier phase.

SUBJEKTIVNÍ HODNOCENÍ VÝZNAMNOSTI VYBRANÝCH TYPOGRAFICKÝCH VLASTNOSTÍ MARKETINGOVÝCH MATERIÁLŮ

Petra Talandová, Jiří Rybička

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(3), 211-222 | DOI: 10.11118/actaun200856030211

This paper concentrates on the problems of marketing materials quality evaluation and their formal aspect and also customers' marketing materials evaluation. This area has not been concentrated on very much and nor in the literature is described. The paper presents the results of our own research which queries how the customers subjectively perceive and evaluate the marketing materials. The emphasis was put on the materials quality i.e. on what materials are considered as quality materials by the customers and which attributes mainly influence the quality. The results were aggregated on the basis of customers' responses an also on the basis of practical examples evaluation which included intentional mistakes.
The subjects of the evaluation were marketing materials quality as a general feature, the attributes influencing the quality and marketing materials quality and company quality relation. Also the examples including mistakes were evaluated. According to the questioning results, the respondents' answers vary much. It is not possible to find unambiguously right or wrong marketing materials evaluation. This area will be developed in further research which will be concentrated mainly on the typographical aspects.
The aim of this paper is to delimit and to define the present situation through the research result examination, to define 'quality' and to describe the way how marketing materials are perceived by the customers.

ANALÝZA FAKTORŮ OVLIVŇUJÍCÍ ROZHODOVÁNÍ ČESKÝCH DOMÁCNOSTÍ PŘI NÁKUPU ODĚVŮ A OBUVI

Zuzana Toufarová, Radmila Presová

Acta Univ. Agric. Silvic. Mendelianae Brun. 2007, 55(6), 163-176 | DOI: 10.11118/actaun200755060163

The paper analyses buying behaviour of Czech households on the market with footwear and cloths. It aims at factors influ, encing this behaviour, e.g. price, brand, quality, product attributes, habits, price reductions, advertisement, innovation and word-of-mauth. Primary data were obtained via survey of 727 Czech households by staff of the Department of Marketing and Trade, Mendel University of Agriculture and Forestry Brno. The paper provides results of correlation analysis and factor analysis. When making purchase decisions, households identify attributes and parameters of clothes and footwear as the most important factor. Due to factor analysis, factors were reduced into four comprehensive groups.

První zkušenosti se vzájemnými interakcemi podnož révy vinné x mšička révokaz

Pavel Pavloušek

Acta Univ. Agric. Silvic. Mendelianae Brun. 2005, 53(5), 117-124 | DOI: 10.11118/actaun200553050117

Grape phylloxera, Dactulosphaira vitifoliae Fitch., is one of most destructive insect pest of cultivated grapes (Vitis vinifera L.) worldwide. Phylloxera was the cause of incomparable structural changes in European viticulture. It also led to the usage of new biotechnology - rootstocks for grape varieties. The direct damage is related to phylloxera feeding of roots and leaves. Rootstocks bred solely with American Vitis spp. parentage allow little or none of phylloxera related root damage that is seen on Vitis vinifera. Rootstocks with partial Vitis vinifera parentage may also confer a high level of grape phylloxera resistance, but this resistance is not durable. Rootstock was evaluated under laboratory conditions and with pot trials. Resistance against phylloxera at roots and leaves was evaluated. Highest resistance degree was proved for variety Börner. Good resistance was found for most of tested rootstock varieties. Very good resistance have SO4 PO 0/7 and Craciunel 2 PO 0/6. It is interesting, that hybrid Kl×SO4 has also relatively good resistance. This promising franco-american needs further examination thanks to its good growing properties. After long time, this research offers new results about rootstock and phylloxera interactions under conditions of Southern Moravia. Results serve as a ground for further resistance breeding against phylloxera in Czech Republic.

Validace simulačního modelu pro brambory

Milada Šťastná, Petra Oppeltová, Jana Dufková

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(2), 217-226 | DOI: 10.11118/actaun200856020217

Aim of the study focused on evaluation of SUBSTOR - Potato model and its utilization in potato grows management in the Czech Republic. The experimental field used for the model evaluation was located in Žabčice - South Moravia region with altitudes of 179 meters above the sea level. Tuber yield served as reference for the model evaluation. Nine years experimental data set (1994-2002) was used for the model validation. Rosara cultivar represented very early growing potato, Karin cultivar depicted early growing potato (Solanum tuberosum L.) in the experiment. Comparison between observed and simulated tuber yields presented the evaluation process of SUBSTOR - Potato model. Tuber yields simulated by the model showed excellent accuracy (R2 = 0.97) for Rosara cultivar, but only for four of tested years (1997, 1998, 1999 and 2002). Karin cultivar matched lower value (R2 = 0.43). The model tended to underestimate the tuber yield for non seasonable conditions (i.e. dry years - low amount of precipitation and its disordered distribution during the growing season or higher mean air temperature) and showed the sensitivity to selected cultivars. Study proved SUBSTOR - Potato model as suitable for utilization in potato management; however, potential differences might be expected while using the model under extreme weather conditions.

Vliv rychle fermentovaného prasečího hnoje na výnosové parametry brokolice a vybrané půdní parametry

Peter Kováčik, Anton Uher, Tomáš Lošák, Peter Takáč

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(5), 119-124 | DOI: 10.11118/actaun200856050119

The effect of Difert (a pig manure fermented by caddices of domestic flies produced on sawdust litter) on broccoli yield parameters and selected soil parameters were investigated on gleic fluvisol in a small-plot field trial localized at area of Slovak University of Agriculture in Nitra (48°18' N, 18°05' E).
The results showed that Difert applied in doses of 250 kg N.ha-1 and 350 kg N.ha-1 acted positively on the yields of fresh primary broccoli roses. However, the results are not statistically significant. Also a positive effect on N, P, K, Ca, Mg contents in broccoli roses was recorded. Difert has a moderate alkalizing effect on soil and increases the content of Cox in the soil. Moreover Difert insignificantly decreased the content of vitamin C and significantly increased the content of nitrates in broccoli roses, but the worst qualitative effect on broccoli parameters was detected by applying mineral N fertilizers, which significantly increased the content of nitrates in broccoli roses and insignificantly decreased the vitamin C content. However, it resulted in the highest broccoli yields. The application of mineral N fertilizers had a negative effect on the total content of carbon in the soil as well.
The effect of Difert on broccoli yield and soil parameters refers to the feasibility of reducing the maturing period of the manure from 6 months to 1 week, in order to decrease the manure storage capacities.

Temperament holštýnsko-frízských krav při dojení v dojírně a jeho vztah k mléčné produkci

Andrea Szentléleki, Jeremy Hervé, Ferenc Pajor, Daniel Falta, János Tőzsér

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(1), 201-208 | DOI: 10.11118/actaun200856010201

The aim of this study was to evaluate the change of temperament of Holstein cows scored before and during milking during the entire lactation and to calculate correlation between temperament measured in the two moments as well as milk production traits and temperament. Observations were carried out on 17 primiparous Holstein Friesian cows starting their lactation within 85 days. Measurements of temperament and milk production traits were taken once in each month of the lactation, during the morning milking, in a milking parlour. Temperament was assessed in a 5-point scale during udder preparation and milking procedure (1: very nervous, 5: very quiet). Data of milk yield and milk flow were collected individually on each test day morning. Results showed changes during the lactation in temperament of cows scored directly before milking (P < 0.01), however, temperament during milking did not alter with months (P > 0.10). By correlation coefficients, behaviour assessed in the two moments cannot be regarded as the same. In addition loose, significant relations were found only between milk traits and temperament before milking.

Ověření stability RNA pomocí reverzní transkripce a PCR v reálném čase

Karel Bílek, Jana Zrůstová, Aleš Knoll

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(4), 219-222 | DOI: 10.11118/actaun200856040219

The aim of this study was to verify an effect of RNA storage in different laboratory conditions. Especially, this work was focused on the importance of using diethylpyrocarbonate (DEPC) treated water for storage of isolated RNA. The effect of storage of RNA samples in different temperatures was monitored according to various times as well. Isolated RNA was incubated at 20 °C, 4 °C, -20 °C and -80 °C, whereas the temperature -80 °C was used as a control. After incubation only mRNA was converted to cDNA by reverse transcription. The polymerase chain reaction in real time (real-time PCR) was used for a measurement of RNA degradation. No statistically significant interactions were found between RNA treatment conditions if analysis of variance (ANOVA) model was applied. The result showed that storage of isolated RNA in water treated with DEPC is not necessary. This approach prevents possible inhibition downstream reaction caused by DEPC. The results of this study can be used in all molecular applications based on RNA.

HODNOCENÍ POSKYTOVÁNÍ ZAMĚSTNANECKÝCH VÝHOD V SOUVISLOSTI S POHLAVÍM ZAMĚSTNANCŮ

Jiří Duda

Acta Univ. Agric. Silvic. Mendelianae Brun. 2007, 55(6), 209-214 | DOI: 10.11118/actaun200755060209

Providing employee benefits is a form of rewarding employees just for the fact that they are employees of the organization. The aim of paper was to find out, whether there exists a relation between the gender of respondents and their answers. It came from certain premises of research results, which were fulfilled. It was found that not providing employee benefits is not a reason for termination of the employment and search for a new job (86 % respondents). Employees (more than 80 %) prefer the possibility to choose between employee benefits, and employers should react to this information through defining rules of choice between the possible benefits. So far, employees of these firms cannot choose employee benefits they would want. Answers (more than 60 %) of employees related to whether they prefer wage increasing or expansion of employee benefits proved the premise and previous studies of the author, where a high preference of wage increase to offers of employee benefits was found. As confirmed by the research, answers of respondents are not dependent on gender of respondents.

Vztahy mezi respirací, kvalitou humusu a kationtovou výměnnou kapacitou u vybraných subtypů černozemí jižní Moravy

Jiřina Foukalová, Ľubica Pospíšilová, Martin Janček

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(1), 83-90 | DOI: 10.11118/actaun200856010083

Soil organic matter (SOM) undergoes short and long-term transformation in the soil. Microorganisms through their enzymes are able to mineralize organic carbon while the rate of this process is different. Biological test though referred to one of the main diagnostic methods for evaluating soil quality/health. The aim of our work was to determine basal respiration, total carbon content, fractional composition of humus and basic parameters of soil colloidal complex in selected subtypes of chernozem in South Moravia region. Basal respiration was measured using Vaisala GMT220 apparatus. Total carbon content was determined by oxidimetric titration and basic parameters of soil colloidal according to Mehlich. Results showed that production of carbon dioxide varied from 0.09 to 0.27 mg CO2/100g/h. Linear correlation between basal respiration and humification degree was found. Humus content varied from 2.15% to 4.6%. No correlation between quantity of humus and basal respiration was observed. Higher values of basal respiration were connected with higher quality of HS. Significant linear correlation between total carbon content (TOC) and cation exchange capacity (CEC) was found.

Dynamika impedance sliznice pochvy a poševní předsíně u cyklujících koz

Ivo Křivánek

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(4), 109-114 | DOI: 10.11118/actaun200856040109

The changes of vaginal and vestibular impedance during the oestrous cycle in goats were examined. The onset of oestrus was teased with a buck once a day during the experiment. Impedance was measured by a four-terminal method. The vaginal impedance was recorded under slight pressure of electrodes to the vaginal dorsal wall at the cervix. The vestibular impedance was recorded under slight pressure of electrodes to the vestibular dorsal wall 5 cm from the vulva and at the vulva. The impedance was measured once a day from 4 days before the expected oestrus to 6 days after onset of oestrus. The vaginal impedance at the cervix decreased during pro-oestrus (P < 0.01) and increased during oestrus (P < 0.01). The vestibular impedance 5 cm from the vulva decreased during pro-oestrus (P < 0.01) and increased after oestrus (P < 0.01). The decrease of vaginal impedance during peri-oestrus was nearly twofold in comparison with the vestibular impedance 5 cm from the vulva. No significant decrease of the vestibular impedance at the vulva was found during the oestrous cycle. The results indicate that the vaginal impedance at the cervix and vestibular impedance 5 cm from the vulva measured by means of a four-terminal method during the oestrous cycle display cyclic changes that are closely related to the oestrous behaviour of goats.

KOMPARACE DEMOGRAFICKÉHO CHOVÁNÍ KRAJŮ ČESKÉ REPUBLIKY POMOCÍ VÍCEROZMĚRNÝCH STATISTICKÝCH METOD

Marie Prášilová, Jan Grosz, Pavla Hošková

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(6), 103-112 | DOI: 10.11118/actaun200856060103

The inhabitants of separate CR regions show varying demographic behaviour that presents itself in the demographic measures' values. The paper offers a comparison of the development of selected measures of size and movement of the population in the regions of CR in 1993 and 2006 years. Attention is paid to the changes in measures of economic and biological structure, life expectancy and some of the measures of human reproduction, patterns of growth and migration. Multivariate analysis methods have been employed for the solution. Selection of variables has been carried out in each year using factor analysis and similarity of the regions has been described by the hierarchic agglomerative clustering method. During the thirteen years, changes occurred in demographic behaviour of the regions. Currently the Capital Prague and the Středočeský Region differ significantly. All the regions remaining have been stabilized as concerns the demographic measures and they show homogeneity.

Kvalita musculus longissimus pars thoracis v těžších kategoriích býků českého strakatého a montbeliárdského plemene

Jan Šubrt, Gustav Chládek, Radek Filipčík

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(2), 235-244 | DOI: 10.11118/actaun200856020235

Non-significant differences were established when the nutritional and technological beef quality of Czech Fleckvieh and Montbeliard and their reaction to the end of feeding at the different age and different carcass growth intensity were studied.
Bulls were fattened until average weight of 656 kg. Montbeliard beef quality evaluation shown non-significant difference of higher intramuscular fat proportions and energy value compared to Czech Fleckvieh. Technological quality evaluation only indicated the tendency to lighter meat, lower water retention and lower level of hydroxyproline. Slaughter age rising in both breeds (the boundary vas 570 days) resulted in non-significant increasing of intramuscular fat together with significant (P < 0.05) increasing of muscle pigmentation content and non-significant shortening and water retention reduction.
Longer fattened bulls at both breeds shown non-significant m.l.th. area reduction at higher difference at Montbeliard. Net gain level as a carcass growth intensity, showed non-significant intramuscular fat production. Higher level of net daily gain produces, particularly at Montbeliards, lead to increasing of hydroxyproline. Higher growth intensity of Czech Fleckvieh influenced pigmentation content increase. Higher growth intensity in both breeds leads to enlarging the m.l.th.

Dielektrické vlastnosti materiálů při mikrovlnných frekvencích

Ivo Křivánek

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(5), 125-132 | DOI: 10.11118/actaun200856050125

The paper introduces the review of the present state of art in the measurement of the interaction of electromagnetic waves with different kinds of materials. It is analysis of the possibilities of the measurement of the interaction of high frequencies waves (microwaves) with materials and proposal of the experimental method for the studies mentioned above.
The electromagnetic field consists of two components: electric and magnetic field. The influence of these components on materials is different. The influence of the magnetic field is negligible and it has no impact on practical use. The influence of the electric field is strong as the interaction between them results in the creation of electric currents in the material (Křivánek and Buchar, 1993).
Experiments focused on the evaluation of the complex dielectric permitivity of different materials have been performed. The permitivity of solid material is also measurable by phasemethod, when the specimen is a part of transmission sub-circuit. Microwave instrument for complex permittivity measurement works in X frequency band (8.2-12.5) GHz, the frequency 10.1 GHz was used for all the measurement in the laboratory of physics, Mendel University in Brno. The extensive number of experimental data have been obtained for different materials. The length of the square side of the aerial open end was 50 mm and internal dimensions of waveguides were 23 mm × 10 mm. The samples have form of the plate shape with dimensions 150 mm × 150 mm × 4 mm.

POPISNĚ-ANALYTICKÁ METODA IDENTIFIKACE POTENCIÁLU VENKOVSKÉHO PROSTORU JAKO NÁSTROJ REGIONÁLNÍHO ROZVOJE

Hana Mrázková

Acta Univ. Agric. Silvic. Mendelianae Brun. 2007, 55(1), 117-128 | DOI: 10.11118/actaun200755010117

During the summer time of 2005 the pilot study focused on analysis of rural areas (especially its human and landscape potential) was provided. There was choosed four villages in region Vysočina along Svratka and Fryšávka river (microregion Novoměstsko) as a model area. The study based on own methodological approach which follows indicators of sustainable developments over the time. This set is divided into four groups - landscape/environment, society, economic and demographic characteristics. There are four quantitative indicators of the SD in each groups. This basic set is completed by qualitative research (interwiews, questionnaire etc.). This approach can be used as one of the tools of regional development policy. The study was supported by Internal Grant Agency of Mendel University of Agriculture and Forestry.

Obsah vybraných biogenních prvků v pletivech sazenic smrku ztepilého (Picea abies /L./ Karst.) a buku lesního (Fagus sylvatica L.) po hnojení dusíkem a hořčíkem

Eva Palátová, Oldřich Mauer, Jiří Libus

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(1), 259-266 | DOI: 10.11118/actaun200856010259

The paper informs of N, P, K, Ca and Mg-contents in the selected organs (tissues) of 4-year old Norway spruce (Picea abies /L./ Karst.) and 3-year old European beech (Fagus sylvatica L.) transplants after two years of Mg fertilization (100 kg Mg.ha-1.year-1) in the form of magnesium sulphate, and N fertilization (100 kg N.ha-1.year-1) in the form of ammonium sulphate. Analyses of buds, needles/leaves, bark and wood of above-ground part, fine roots (≤ 1 mm) and small-diameter roots (> 1 mm) showed that the greatest amounts of uptaken nutrients are in both tree species stored in assimilatory organs and in buds. The increased supply of nitrogen showed most in small-diameter roots (spruce), and in root-wood, and wood of stem and branches (beech). The two species responded to the increased supply of magnesium by increasing the bioelement content in root-wood and in fine roots. The increase of Mg-content in leaves occurred only in the second year of the fertilization.

Obsahy minerálních živin v půdě a půdní mikrobiální aktivita u vinné révy naočkované arbuskulární mykorhizní houbou (AM) v Chile

Eduardo von Bennewitz, Estrella Garrido, Claudio Fredes, Lorena Gutierrez, Tomáš Lošák

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(5), 13-17 | DOI: 10.11118/actaun200856050013

A two year-experiment was carried out to study an effect of root inoculation with arbuscular mycorrhizal (AM) fungus on soil mineral concentrations and soil microbial activity in grapevine (Vitis vinifera) cv. "Cabernet Sauvignon" cultivated in Chile. Plants were inoculated with a commercial granular inoculant (Mycosym Tri-ton®) and cultivated in 20 L plastic pots filled with an unsterilized sandy clay soil from the Vertisols class under climatic conditions of Curicó (34°58' S; 71°14' W; 228 m ASL), Chile.
Soil analyses were carried out at the beginning of the study and after two years (four samples of rhizospheric soil for each treatment) to assess the effects of mycorrhizal infection on soil mineral concentration and physical properties. Soil microbial activity was measured by quantifying the soil production of CO2 in ten replications of 50 g of soil from each treatment. Root mycorrhizal infection was assessed through samples of fresh roots collected during 2005 and 2006. Fifty samples for each treatment were analyzed and the percentage of root length containing arbuscules and vesicles was assessed.
During both years (2005 and 2006) all treatments showed mycorrhizal infection, even the Control treatment where no AM was applied. Mycorrhizal colonization did not affect the soil concentrations of N, P, K, Ca, Mg, K, Ca, Mg, Mn, Zn, Cu, Fe, B, organic matter, pH/KCl and ECe. Soil CO2-C in vitro production markedly decreased during the period of the study. No significant differences where detected among treatments in most cases.

Kvalitativní charakteristiky a antioxidační vlastnosti kultivarů brokolice (Brassica Oleracea L. var. italica Plenck)

Marek Gajewski, Paweł Szymczak, Marta Gorczyca, Maja Madejska

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(1), 91-96 | DOI: 10.11118/actaun200856010091

Quality traits of three broccoli cultivars, which were grown for autumn crop was determined: 'Chevalier' F1, 'Milady' F1 (cultivars of Dutch origin) and 'Cezar' F1 (of Polish origin). Immediately after harvest sensory quality of broccoli was evaluated, using the quantitative descriptive analysis method (QDA). In 'brainstorming' session there were chosen 14 attributes (profiles) concerning smell, texture, taste / flavour. Overall quality impression was also scored and hedonic test of broccoli liking was performed. Other quality traits determined were: antioxidant activity, total carotenoids content, vitamin C content, colour parameters in CIE L*a*b* system. These traits were determined separately for florets and stems of broccoli plants, both of which are usable parts of this vegetable. Results showed that investigated cultivars differed in respect of quality traits concerning sensory attributes, antioxidant activity, carotenoids content, vitamin C content and colour parameters. Results showed also that florets of broccoli performed higher antioxidant activity than stems. Carotenoids content in broccoli cultivars was much higher in florets than in stems, but vitamin C content was on similar level in florets and stems of the plants. Florets and stems of all broccoli cultivars differed much in respect of colour parameters - lightness, greenness and yellowness.

Chování broskví při výbuchovém zatěžování pod vodou

Libor Severa

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(4), 151-160 | DOI: 10.11118/actaun200856040151

The paper concerns with the experimental and numerical study of the peach (Red Haven) at underwater shock wave loading. The behaviour of the peach skin as well as peach stone can be described in terms of elasticity. Following experiments have been performed: tensile testing of the skin (exocarp) specimens at constant elongation at strain rate 0.01 s-1, compression test of the mesocarp specimens at different strain rates corresponding to quasi - static loading, compression test of the mesocarp specimens at the high rates of strain (about 1000 s-1), and compression test of the whole peach stone at strain rate corresponding to quasi - static loading. The model of the peach has been suggested. The model is used for the numerical simulation, which was performed on the software LS DYNA 3D finite element code. Pressure wave propagation in the water has been studied and following quantities evaluated: pressure on the peach surface, displacement, and surface velocity. Two different models (Maxwell and Kelvin) have been used. The results of this simulation show some agreement with results of the observation (undamaged peach skin). The numerical simulation also gives an insight on the details of the loading, which was recently tested as a tool of fruit treatment. It has been shown that undewater shock wave treatment of peaches can lead to their softening.

ANALÝZA ZÁKLADNÍCH CHARAKTERISTIK DEMOGRAFICKÉ DYNAMIKY V KRAJÍCH ČESKÉ REPUBLIKY

Jaroslav Dufek

Acta Univ. Agric. Silvic. Mendelianae Brun. 2007, 55(6), 55-64 | DOI: 10.11118/actaun200755060055

The work deals with the evaluation of an achieved level of the basic characteristics of the demographic dynamic in the regions in 2005, dividing regions to homogenous groups always according to pairs of indicators having logical relationship between each other. As a pair characterizing population migration were selected a rate of marriages - divorces, marriages - births, births - mortalities, immigrations - emigrations, natural population growth - immigration population growth. According to a direction of the research intention a special attention was paid to South Moravia region and to Vysočina region. According to an expected reciprocal relationship of the rate of marriages - births the regression function was determined including a correlative index (I = 0,739*), confirming and quantifying the relationship.

Vliv ošetření chlormequatem a paclobutrazolem na růst a kvetení světlice barvířské (Carthamus tinctorius L.)

Jiří Uher

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(2), 251-254 | DOI: 10.11118/actaun200856020251

The responses of six safflower varieties (Carthamus tinctorius L.) to chlormequat and paclobutrazol treatments were monitored. Although a chlormequat application did not bring about any significant differences in flowering or morphological traits, plants treated with paclobutrazol were shorter and had a higher number of flower heads. However, contrary to expectations, treatment by paclobutrazol also made flowering earlier. This does not appear to support the idea that safflower is a typical long-day plant, progressing to floral induction and stem elongation after vernalization in the winter at the leaf-rosette stage).

Zoobentos malých toků Svitavska

Ivo Sukop

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(5), 199-202 | DOI: 10.11118/actaun200856050199

The qualitative and quantitative composition of macrozoobenthos of two brooks of the Svitavy region was studied. Both brooks rise in the region with formerly mines. Altogether, 61 taxa of macrozoobenthos were determined. Saprobical indices of both brooks correspond to beta-mesosaprobity class at all sampling sites.

Odběr a bilance živin při různé intenzitě využívání trvalých travních porostů

Jozef Ržonca, Pavlína Mičová, Marie Svozilová, Antonín Macek, Marie Štýbnarová

Acta Univ. Agric. Silvic. Mendelianae Brun. 2007, 55(1), 143-152 | DOI: 10.11118/actaun200755010143

In 2003-2005 it was solved the issue about the nutrient balance in the permanent grasslands of Research Institute for Cattle Breeding Rapotín. In trial it was used these types of utilization: 1. Intensive - 4 cuts per year (1st cut up to 15th May, every next after 45 days), 2. Medium intensive - 3 cuts per year (1st cut from 16th to 31st May, every next after 60 days), 3. Low intensive - 2 cuts per year (1st cut up to 15th June, 2nd after 90 days), 4. Extensive - 2 cuts per year (1st cut from 16th to 30th June, 2nd after 90 days). There were following variants of the fertilization: A - no fertilization, B - P:K 30:60 kg.ha-1, C - N:P:K 90:30:60 kg.ha-1, D - N:P:K 180:30:60 kg.ha-1. There was the considerable reaction of the permanent grassland on the nutrient application. The highest value of the coefficient of the neutral efficiency was by the fertilization N:P:K 90:30:60 kg of the pure nutrients. By the most of the variants we have noticed the negative nitrogen balance. The negative balance of the phosphorous was marked only by the unfertilized variants. All variants of the permanent grassland utilization had the negative potassium balance. The utilization had the significant influence (P0.01) to all observed indicators. The year had the significant influence too. From the point of view of the rational plant nutrition and of the environment protection from the contamination (especially from the nitrates) it appears as the most advisable the medium intensive type of the utilization with nitrogen dose: N:P:K 90:30:60.

Změny fyzikálních a chemických parametrů hypertrofního rybníka po aplikaci prasečí kejdy

Radovan Kopp, Jan Mareš, Andrea Ziková, Tomáš Vítek

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(2), 95-100 | DOI: 10.11118/actaun200856020095

During the years 2001 and 2002 we conducted hydrochemical monitoring of intensively managed pond to evaluate the impact of high pig slurry doses on eutrophication. Pig slurry application was carried out in colder period of the year (February-April) via tube system with sludge pump from nearby piggery.
Our results showed that pig slurry application do not permanently affect the water quality of Jarohněvický pond. When the correct application is made slurry is effectively utilized by biomass for the growth, which prevents surface and underground waters to be polluted as in the case of incorrect application on agricultural land.
Critical point of this technology in terms of water management is the way of pig slurry application and the exact dose. Even extremely high slurry doses (16.1 kg.m-2 in 2001 and 15.6 kg.m-2 in 2002) used in Jarohněvický pond did not negatively affected pond ecosystem. Only higher amount of organisms that increased natural fish production was recorded. It is necessary to implement this ameliorative intervention in colder period of the year considering higher hazard of variations in decisive hydrochemical parameters at higher water temperature.

Validace hlubokého zamrazování pilotních vzorků pro kontrolu stability výsledků nepřímých analýz základního složení mléka a pro jejich dlouhodobou údržnost

Oto Hanuš, Pavel Hering, Václava Genčurová, Zdeněk Motyčka, Jr., Radoslava Jedelská, Jaroslav Kopecký

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(5), 57-68 | DOI: 10.11118/actaun200856050057

Essential part of raw milk component measurement is indirect infraanalyse. The checking of time measurement stability is important there. The preparation of pilot samples was described. Information about deep frozen milk pilot sample stability are sporadic. Aim of this work was to verify the stability of long-term stored and deep frozen pilot samples (FPSs). Pilot samples were frozen in liquid nitrogen bath -196 °C and after that stored at -21 °C for one month (A) and more months (B) till analyse. The pilot samples were measured by CombiFoss 6000: fat F (%); protein CP (%); lactose L (%); casein C (%); solid non fat SNF (%); urea U (mg/100ml); somatic cell count SCC (ths./ml). In the short-term (A) experiment the impact of freezing on pilot milk samples was relatively small, in the framework of acceptable value of repeatability (±0.02 %) for components. The stability of values of FPSs was better according to standard deviations for important F evaluation in H (Holstein) breed samples. The repeatability of values of FPSs in the time was very good for other components. The repeatability was better for SCC in J (Jersey) breed samples (±16.5 thousands/ml). That is why the higher variability (±30.1 thousands/ml) in H sample is visible less sceptically. The apparent result trends were not observable in the repeatability development of important milk indicators in FPSs. The mild trend was only in CP, but this trend covered absolutely very small shift (variation range). There are only oscillations, which are similar between J and H samples. It is possible to attribute these oscillations rather to instrument effects than to sample effects. The oscilations were markedly higher in the long-term (B) experiment. Between J and H samples the oscilations were very similar in curves F and L. It is also possible to attribute them more to instrumental effects. The repeatability values (standard deviations sd) of FPSs were mostly lower than ±0.06 %. It is acceptable for result agreement between indirect and reference method. Relevant sd varied from ±0.025 % for L to ±0.059 % for F (in J breed) with exception CP ±0.085 % in J sample. Also B procedure was shown as applicable for instrumental sability control in half year period. In practice the one reference value for concrete FPS is valid from one to next calibration. Persistent trend in repeatability of FPSs can indicate an inadequate instrumental drift. The applied FPS procedure is usable for stability control of instrumental measurement in milk laboratories.

VLIV DÉLKY ZRÁNÍ OLOMOUCKÝCH TVARŮŽKŮ NA JEJICH SENZORICKÉ A TEXTURNÍ VLASTNOSTI

Olga Cwiková, Šárka Nedomová

Acta Univ. Agric. Silvic. Mendelianae Brun. 2007, 55(5), 45-50 | DOI: 10.11118/actaun200755050045

The ripened cheese is typical by taste and aroma and texture also. The object of research was the influence of ripening on sensory and texture properties of Olomouc cheese with the determination the optimum lenght of ripening for consumers. High storage temperature of curd, deficiency of air oxygen and some other factors determine the senzory characteristics of this type cheese. The samples were taken from the factory directly and stored in the same conditions in cold (7 °C) during 5 weeks. Aroma, colour, appearance, level of ripening, consistence, taste, dry matter and texture analysis by TIRA machine 27 025 were followed. Cutting test measured the resistence to the passage of a knife, penetration test involved measurement of the force required to insert a probe a given distance into cheese. The best results of the flavour have been observed in three and four weeks storing. The best ripening and consistence were evaluated in the fourth and fifth week after cheese production. There was found the decrease of the cheese firmness during the ripening.

Analýza požadavků trhu práce a připravenosti vysokoškolských studentů

Jiří Duda, Tomáš Kotrba

Acta Univ. Agric. Silvic. Mendelianae Brun. 2006, 54(3), 27-36 | DOI: 10.11118/actaun200654030027

Educated university graduates are demanded by employers. Requirements of employers on graduates are high; most required are communication skills, decision-making skills, problem solution skills. Very often demand is graduates' willingness to further education, knowledge of foreign languages. The paper describes the opinions of students of Faculty of agronomics and Faculty of business and economics MUAF in Brno on the possibilities to deepen selected skills. Students of both faculties realize the necessity of further training. More than 96% of students consider the knowledge of foreign languages to be very important and prefer teaching grammar and conversation. Students evaluated the quality of teaching foreign languages at MZLU in Brno, too. Almost 40% of students of Faculty of agronomics and 70% of students of the Faculty of business and economics consider the teaching of foreign languages as insufficient. These negative views were probably influenced by a small extent of teaching languages during their studies. Communication skills represent another significant factor, and students evaluated the possibility to develop these skills, as well. 50% of respondents from the Faculty of agronomics evaluate these skills as necessary for practice and positively evaluate the development of these skills within teaching at MUAF in Brno. Positive evaluation of communication skills development was also found nearly in three quarters of respondents from Faculty of business and economics.

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