Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2011 (vol. 59), issue 5
Monitoring the damage to epicuticular waxes at silver birch (Betula pendula Roth.) in the changing air pollution spectrum of the Ore Mountains
Emilie Bednářová, Jiří Kučera
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 9-16 | DOI: 10.11118/actaun201159050009 
The paper deals with the study of damage to the assimilatory apparatus of silver birch (Betula pendula Roth) using the study of changes of epicuticular waxes in the period 1997 to 2009. During the period, changes in the air pollution spectrum occurred in the area of the Ore Mountains. At the beginning of the monitoring, above-limit concentrations of sulphur oxides were the main anthropogenic factor. These concentrations resulted in the degradation of epicuticular waxes. Statistical evaluations demonstrated the high dependence of damage to epicuticular waxes on high concentrations of sulphur oxides. Damage to epicuticular waxes by air pollution...
The effect of nitrogen and sulphur fertilization on the yield and content of sulforaphane and nitrates in cauliflower
Nina Čekey, Miroslav Šlosár, Anton Uher, Zoltán Balogh, Magdaléna Valšíková, Tomáš Lošák
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 17-22 | DOI: 10.11118/actaun201159050017
In the field experiment with cauliflower, we investigated the effect of four different variants of nitrogen and suplhur fertilization on quantity and quality of cauliflower in the term of sulforaphane content and nitrate accumulation.The influence of fertilization was statistically significant between control variant and fertilization variants and in both experimental years within all parameters of cauliflower yield.The highest yield of cauliflower was reached at the variant 4 when it was fertilized on the level of nutrients N:S = 250:60 kg.ha-1. The increase of yield against control variant represented value 26.6%. The applied fertilization...
Anodic-modified anticorrosive coatings
Michal Černý, Josef Filípek
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 23-30 | DOI: 10.11118/actaun201159050023
Steel machine parts are exposed to electrochemical corrosion. This applies to many environments including atmosphere, soil, water, and even various fertilizers. High-carbon steel and low-alloyed steel are not stable (in terms of thermo-dynamics), do not feature effective passivation, and even the corrosion products do not form a stable protection layer. As a result, special anti-corrosion protection is critical. In heavy-corrosion environment, paint systems containing Zn have proven to be very effective.Presented text describes verification of paint systems with high Zn content and compares them to galvanic Zn coatings. Steel samples with protective...
Proportional monitoring of the acoustic emission in crypto-conditions
Petr Dostál, Michal Černý, Jaroslav Lev, David Varner
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 31-38 | DOI: 10.11118/actaun201159050031
The work is aimed at studying corrosion and fatigue properties of aluminum alloys by means of acoustic emission (AE). During material degradation are acoustic events scanned and evaluated. The main objective of the article is a description of behavior of aluminum alloys degraded in specific conditions and critical degradation stages determination. The first part of the article describes controlled degradation of the material in the crypto-conditions. The acoustic emission method is used for process analyzing. This part contains the AE signals assessment and comparing aluminium alloy to steel. Then the specimens are loaded on high-cyclic loading apparatus...
Effect of sweet yeast bread formula on evaluating rapid mix test
Petra Dvořáková, Jindřiška Kučerová, Stanislav Kráčmar
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 39-46 | DOI: 10.11118/actaun201159050039
The aim of this work was to detect how different sweet yeast bread formulas influence results of rapid mix test and by the help of sensory analysis to discover consumer preferences and possible benefit and use in bakery industry. Applied raw materials (ground wheat flour T 530, yeast, sugar, salt, oil, egg, improver Hit) along with basic formula were taken from the Varmužova bakery in Boršice by Buchlovice. The basic formula served as a standard (I), other six formulas were then determined (II-VII). In each formula, the rate of yeast, sugar or oil was altered in the range of ± 10% compared with the standard. Flour bread-making quality - Hagberg...
The forage utilization of winter pea-cereal mixture in agriculture low-input system
Josef Hakl, Václav Brant, Kamila Mášková, Karel Neckář, Jan Pivec
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 47-52 | DOI: 10.11118/actaun201159050047
The aim of this paper is to evaluate the forage utilization of winter catch crop in relation to yield and mixture composition. In 2006-2009, the plot experiment with winter pea in mixtures with rye and triticale was conducted under completely randomized design with four replicates. The productivity of mixture was above 10 t.ha-1 whilst the significantly lowest value was observed for pea monoculture. The rye represented the most productive component in mixture but it achieved lower forage quality in comparison with triticale. The ratio of pea varied from 7 to 38 % in dependence on year and companion cereal. The triticale mixture provided...
Selection and evaluation of single-layer coating compositions in corrosive environments
Jiří Hanuš
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 53-64 | DOI: 10.11118/actaun201159050053
The objective of the work was to select a suitable methodology for accelerated corrosion tests of single-layer coating compositions (hereinafter referred to as CC), to assess the condition of coatings during corrosion tests and to evaluate the resistance of the monitored single-layer CCs after the completion of the tests in selected corrosive environments. The results were used for the determination of the potential use of the selected single-layer coating compositions in agricultural environments.The following single-layer, water-based CCs were applied to sheet steel samples: V 2026, Aquapol_J and Denapox EZ. The following synthetic CCs were selected:...
Chosen biotic factors influencing raw cow milk freezing point
Oto Hanuš, Yunhai Zhang, Marek Bjelka, Josef Kučera, Petr Roubal, Radoslava Jedelská
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 65-82 | DOI: 10.11118/actaun201159050065
The milk freezing point depression (FPD) is important physical property. FPD is influenced by milk composition especially by components with osmotic pressure activity and by other physiological factors. There is possible to indicate a foreign (extraneous) water addition into milk by FPD. This is necessary to have a good estimated legislative FPD discrimination limit (FPD-L) for purpose of milk quality control. This paper was aimed at obtaining information to improve such estimation. Impacts factors as season variations, estimated state of dairy cow nutrition and some milk components and properties on milk FPD and their relations to FPD were quantified...
Effect of probiotic preparation for chemical composition of meat cocks different combinations of hybrid chicks
Peter Haščík, Miroslava Kačániová, Marek Bobko, Jaroslav Pochop, Michal Mihok, Henrieta Arpášová
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 83-94 | DOI: 10.11118/actaun201159050083
In the experiment were verified the application of probiotic preparation through a water supply for feeding of cock's hybrids Ross 308, Hubbard JV and Cobb 500 in the chemical composition of the most valuable parts of the carcass. Probiotic was based on the strain Lactobacillus fermentum with containing of 1.109 cfu.g-1 and potentially components of maltodextrin and oligofructose in 1% concentration. Length of feeding period was 42 days. Cocks were fed an ad libitum with the same starter mixture HYD-01 to 21th day and from 22nd to 42nd day of feeding with mixture HYD-02 in powdery...
Psocid taxocenoses structure and diversity (Insecta: Psocoptera) in the forest ecosystems of the Piceeti-fageta s. lat. zone in the Western Carpathian Mts.
Otakar Holuša
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 95-104 | DOI: 10.11118/actaun201159050095
Psocid taxocenoses (Psocoptera) were studied in forest ecosystems of the Western Carpathian Mts. during 1997-2001. As a study frame, vegetation tiers (= altitudinal vegetation zones) were used. Lower units of forest typological system (forest type complexes) were used for a classification of ecological conditions as well. Only a part of material, i.e. individuals that was found in the forest ecosystems of Piceeti-fageta s. lat. communities (= the 6th spruce-beech vegetation tier) was evaluated for purpose of this work. This vegetation tier is widespread in higher parts of mountains (the Moravskoslezské Beskydy Mts. and partly...
The weed seed bank assessment in two soil depths under various mineral fertilising
Elena Hunková, Jan Winkler, Eva Demjanová
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 105-112 | DOI: 10.11118/actaun201159050105
The field trial at the experimental station of Slovak Agricultural University in Nitra - Kolíňany (Slovak Republic, maize growing region, Haplic Luvisol and Stagni-Haplic Luvisol) in 1997 year was established. Experiments were based on 14 ha area (424 x 432.2 m) by long strips method. The impact of different mineral fertilisers on six model crops was observed: winter wheat, spring barley, sunflower, winter oilseed rape, maize and sugar beet. Weed infestation of winter wheat, spring barley, maize and sugar beet as well as weed seed bank composition since 2000 year till 2002 year were detected. Three variants of mineral fertilisation were applied: variant...
Effect of season and herd on rennet coagulation time and other parameters of milk technological quality in Holstein dairy cows
Gustav Chládek, Vladimír Čejna, Daniel Falta, Ladislav Máchal
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 113-118 | DOI: 10.11118/actaun201159050113
In five herds of purebred Holstein dairy cows, altogether 220 bulk milk samples were collected with the following average parameters: rennet coagulation time (RCT) 265.2 sec., titratable acidity 6.40 °SH, active acidity 6.72 pH, specific density 1.0281 kg.l-1, fat content 3.81 g.100g-1, protein content 3.28 g.100g-1, lactose content 4.72 g.100g-1, and content of solids non-fat content 8.89 g.100g-1; average values of milk batch volume per herd and diurnal air temperature were 6,072 kg and 8.02 °C, respectively. It was found out that the variable "season" (spring, summer, autumn or winter) significantly...
Effect of peroral copper supplementation on selected haematological indicators of horses
Petra Jančíková, P. Horký, L. Zeman, P. Mareš
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 119-124 | DOI: 10.11118/actaun201159050119
The purpose of our work was to assess the impact of copper on selected haematological indicators of horse. The trial was performed at the Boudky - Velké Němčice farm. The total number of 23 mares was divided into three groups that were subjected to different mineral feeding modes. The experiment duration was 14 days and the blood samples were taken 1st, 7th and 14th day of experiment.The obtained results show that the enrichment of the horse feeding ration with copper changed the monitored haematological parameters values. Assessment of the changes of haematological indicators between individual trial groups fed...
Identification of Fusarium damaged wheat kernels using image analysis
Ondřej Jirsa, Ivana Polišenská
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 125-130 | DOI: 10.11118/actaun201159050125
Visual evaluation of kernels damaged by Fusarium spp. pathogens is labour intensive and due to a subjective approach, it can lead to inconsistencies. Digital imaging technology combined with appropriate statistical methods can provide much faster and more accurate evaluation of the visually scabby kernels proportion. The aim of the present study was to develop a discrimination model to identify wheat kernels infected by Fusarium spp. using digital image analysis and statistical methods. Winter wheat kernels from field experiments were evaluated visually as healthy or damaged. Deoxynivalenol (DON) content was determined in individual kernels...
The use of waste cellulose in production of white mushroom substrate
Ivan Kameník, Jan Mareček
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 131-136 | DOI: 10.11118/actaun201159050131
The employment of industrial wastes in agricultural production is one of the possible ways of waste management. Composting of organic waste can cut the cost of transport and disposal of these wastes while obtaining cheep resource materials for the production of composts. Apart from composting or using wastes in the biogas plants, there is yet another possibility of using local organic waste and it is its employment as a component of substrate (compost) for the white mushroom growing. This study deals with the use of waste cellulose in the production of white mushroom substrate. The aim of this study is to evaluate the impact of cellulose content in...
The possibilities for measurement of saw blades wearing
Ján Kováč, Jozef Krilek
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 137-144 | DOI: 10.11118/actaun201159050137
Some effects come into the practice because of decreasing quality of a cutting knife. These effects then influence the whole cutting process. The paper deals with analysis of methods for evaluation of a chain saw wearing. It is necessary to know the methods for measurement of a chain saw wearing because the tool wearing has significant influence on the whole system acting i.e. machine-tool-work piece. The measurement of wearing rate was realized to obtain knowledge about the wearing rate of cutting knives on chain saws. The goal of measurement was to design suitable methods for evaluation of wearing and definition of exactness for used methods. The...
Study of changes organic acids in red wines during malolactic fermentation
Jindřiška Kučerová, J. Široký
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 145-150 | DOI: 10.11118/actaun201159050145
The aim of this contribution is to be able to describe the movement of organic acids in red wine during malolactic fermentation. Wines from Znojmo wine region were represented by varieties of Svatovavřinecké (Saint Laurent), Rulandské modré (Pinot Noir), Zweigeltrebe, Frankovka (Lemberger) and Dornfelder. The grapes went through the same way of wine making and after completion of alcoholic fermentation were inoculated with pure culture of lactic acid bacteria Oenococcus oeni. Samples were taken for chemical analysis during biodegradation of acids within the range of 2 to 4 days and they were measured using a device WineScan FT 120. Chemical...
Organic, integrated and conventional management in apple orchards: effect on plant species composition, richness and diversity
Zdeňka Lososová, Michaela Kolářová, Luděk Tyšer, Samuel Lvončík
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 151-158 | DOI: 10.11118/actaun201159050151
The study was conducted to assess the effect of conventional, integrated and organic management on differences in plant species composition, richness and diversity. The plants were studied in triads of orchards situated in three regions of the Czech Republic. Data about species occurrences were collected on 15 permanent plots in the tree rows and 15 plots between tree rows in each of the apple orchards during 2009. A total of 201 vascular plant species (127 native species, 65 archaeophytes, and 9 neophytes) were found. Management type and also different regional conditions had a significant effect on plant species composition and on diversity parameters...
Evaluation of Deschampsia caespitosa /L./ Beauv. competition ability in mixtures with main turfgrass species
Jaroslav Martinek, Miluše Svobodová, Tereza Králíčková, Ivo Našinec
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 159-168 | DOI: 10.11118/actaun201159050159
Numbers of tillers and weight of aboveground dry mass were evaluated in a field experiment at the Plant breeding station Větrov of Oseva UNI Choceň a. s., Czech Republic (620 m a. s. l., average year temperature 6.9 ˚C, average year precipitation 642 mm) in mixtures of D. caespitosa cv. 'Kometa' with Poa pratensis L. cv. 'Harmonie' or with Lolium perenne L. cv. 'Filip' during three years of vegetation. The seeding rate was always 40 thous. viable seeds per m2. The proportion of D. caespitosa in the mixtures was 25%, 50% or 75% of the total number of seeds, a monoculture was established too. The sward was...
Tendencies of climatic extremes occurrence in different Moravian regions and landscape types
Bronislava Mužíková, Vítězslav Vlček, Tomáš Středa
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 169-178 | DOI: 10.11118/actaun201159050169
In this study present frequency of several characteristic days as tropical, summer, arctic, frost and ice days and also length of heat waves was compared with modelled future occurrence of these climate extreme indices. Climate-diagrams were used for drought hazard assessment. The main objective of our research was to detect possible changes of frequency of the extreme events toward future. Data from four localities in the Czech Republic (Moravia) were chosen for the evaluation. Each locality represents different climatic, landscape and settlement conditions. Localities are represented by the closest grid points. Future trend was modelled for scenario...
Grasshoppers (Orthoptera: Caelifera) and crickets (Orthoptera: Ensifera) from slopes of Macošská stráň and Vilémovická stráň (Moravský kras Protected landscape area, Czech Republic)
Jana Niedobová, František Chládek, Vladimír Hula
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 179-186 | DOI: 10.11118/actaun201159050179
In 2008 we found 21 species of grasshoppers and crickets on Macošská stráň slope and 18 species on Vilémovická stráň slope. Both slopes are located in the northern part of the Moravský kras Protected landscape area and have xerothermic character. Both slopes are influenced by pasture management. For the most comprehensive picture of Orthoptera we used a standard method (sweeping of vegetation) and nonstandard methods (pitfall traps and Möricke yellow cups). Termophilous species of Orthoptera on Macošská stráň (47%) were dominating. On Vilémovická stráň mezophilous species (46%) were dominating. The most common species were Stenobothrus lineatus...
The availability of mineral nitrogen in Mediterranean open steppe dominated by Stipa tenacissima L.
Irena Novosádová, Jaroslav Záhora, José Damian Ruiz-Sinoga
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 187-192 | DOI: 10.11118/actaun201159050187
The area of interest is located in the Sierra de los Filabres in semi-arid steppe of the province of Almeria in Spain. The amount of water in the soil is a limiting factor and its availability affects the structure and species composition of ecosystem. On the other hand, the type of vegetation affects the water loss via evapotranspiration and thus the soil microclimate. It has a great influence on the growth and activity of soil microbial communities and hence the dynamics of decomposition of organic matter and nutrient availability. The aim of this study was to assess the intensity of microbial transformations of soil organic nitrogen and describe...
Effect of milking vacuum level and overmilking on cows' teat characteristics
M. Pařilová, L. Stádník, A. Ježková, L. Štolc
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 193-202 | DOI: 10.11118/actaun201159050193
The influence of milking vacuum and milk flow level (resp. detachment level) on cows' teat characteristics were studied in four experiments. The MIXED procedure was used to test treatment effects on the level of teat length, teat thickness at the base and half-way between the teat end and the base of udder, teat canal length, teat end width, teat wall thickness, teat cistern width after milking and on differences between these teat characteristics measured before and after milking. A total of 51 cows were included in all experiments. All the cows had clinically healthy udders. Some cows were involved in two or more experiments. Finally, 330 teat measurements...
Water sorption properties of Dutch type semi-hard cheese edge in the range of common storing temperatures
Maria Carolina Soares Pereira, Jiří Štencl, Bohumíra Janštová, Václav Vlášek
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 203-208 | DOI: 10.11118/actaun201159050203
Moisture sorption isotherms of Dutch type semi-hard cheese edge in the temperature range of 10-25 ºC and water activity (Aw) from 0.11 to 0.98 were determined using manometric method. The sorption curves had a sigmoid shape. The equilibrium moisture content (EMC) of cheese samples increased with an increase in Aw at a constant temperature both for water adsorption and desorption. An increase in temperature caused an increase in Aw for the same moisture content (MC) and, if Aw was kept constant, an increase in temperature caused a decrease in the amount of absorbed water. Critical values of equilibrium moisture content, corresponding to the Aw...
The evaluation of forest small-scale specially protected areas and their buffer zones in examples of the region Tišnov, Czech Republic
Kateřina Rebrošová, Markéta Honzová
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 209-216 | DOI: 10.11118/actaun201159050209
This study evaluates the eight forest small-scale specially protected areas (nature reserves: Babí lom, Břenčák, Krnovec, Slunná, Sokolí skála, and Nature monuments: Březina, Květnice, Zlobice) of the total area of 382 ha of the region Tišnov. The evaluation used two methodologies and results of were compared. From the outcomes obtained show that almost all the territories are in good (50%) or moderate (37.5%) status and quality of care is good in most cases (75%). The highest degree of care achieves is in a nature reserve Břenčák, which is generally excellent. The lowest recorded level of care, average, is in a natural monument Slunná. The poor condition...
Early development and growth of sterlet (Acipenser ruthenus) in the Czech Republic
Juraj Rybnikár, Miroslav Prokeš, Jan Mareš, Martin Cileček
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 217-226 | DOI: 10.11118/actaun201159050217
Growth rate of sterlet larvae and juveniles during 2008 and 2009 was studied under experimental and farming conditions in the Czech Republic. The embryos hatched when reaching a mean total length (TL) of 9.0 mm. Larvae were fed by living food, with a gradual transition to dry diet. The exogenous feeding and the larval period of ontogeny started at DAH 9 (day after hatching) reaching TL of 15-17 mm accompanied by melanin plug exclusion. Towards the end of larval period (DAH 39-43, TL 50-58 mm), the embryonic finfold disappeared and the formation of fin apparatus was nearly completed. During the larval and early juvenile development, daily increments...
Prebiotic effect of fructo-oligosaccharides on growth and physiological state of rainbow trout, Oncorhynchus mykiss (Walbaum)
Jiří Řehulka, Bohumil Minařík, Dalibor Cink, Jaroslav Žalák
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 227-236 | DOI: 10.11118/actaun201159050227
Rainbow trout at an average weight of 240 g were examined for the effect of dietary fructo-oligosaccharides in the diet on their growth and physiological state through selected biochemical parameters of the blood plasma. The prebiotic product Profeed® (experimental group, EG) was administered on a continuous basis at a rate of g kg-1 of pellets for 105 days. The best growth performance for the EG was found in 42 days (363 ± 34.7 g vs. 340 ± 36.7 g, P = 0.003) and in 63 days (387 ± 35.6 g vs. 364 ± 42.3 g, P = 0.011). SGR of the fish from the EG was 0.69% and from the...
Creation of the snow avalanche susceptibility map of the Krkonoše Mountains using GIS
Petr Suk, Martin Klimánek
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 237-246 | DOI: 10.11118/actaun201159050237
This article deals with the development of the snow avalanche susceptibility map in the Czech part of the Krkonoše Mountains using the free Geographic Information System (GIS) GRASS. The area susceptibility map consists of two components: the morphological risk map, which is derived from the digital terrain model (DTM) and describes the slope steepness, aspect and curvature of the slope, and the protecting vegetation influence map, which is based on supervised image classification (spectrozonal aerial photos) and takes into consideration the importance of vegetation cover. The final map also includes starting zones calculated on the basis of significant...
Effect of selected factors on basic reproduction, growth and carcass traits and meat production in Texel sheep
Ladislav Štolc, Martin Ptáček, Luděk Stádník, Marek Lux
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 247-252 | DOI: 10.11118/actaun201159050247
The objective of this work was to determine the effect of lambing year, sire effect, parity of ewes' lambing (PL) and gender on selected indicators of meat production and fertility in a Texel sheep herd. The evaluation proceeded for a period of 5 years, when 356 ewe - lambs and 321 Texel ram - lambs were monitored. Processing of the data set was done by the SAS program, GLM procedure. The lambing year had a significant effect (P < 0.05; 0.01) on all indicators observed except litter size. The sire effect was found to be significantly (P < 0.05; 0.01) related to all indicators monitored. The significant differences (P < 0.01) were found in...
The effect of setup of three point linkage on energetic and performance parameters of tractor aggregate
Marek Tatíček, František Bauer, Pavel Sedlák, Jiří Čupera
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 253-262 | DOI: 10.11118/actaun201159050253
The object of this paper is to analyze the effect of setup of three point linkage on energetic and performance parameters of tractor aggregate. For this purpose were made two series of measurements. The first series was realized with the tractor NewHolland T7050 aggregate with 5-furrow reversible plough plough KUHN HUARD VM 150 5 NS. Data such as engine load, engine revolution, diesel fuel consumption, diesel fuel temperature, were got from CAN Bus network during the measurement. Then were measured following parameters total time of ploughing, dephth of ploughing, time of turning and swath of the tractor aggregate. The specific consumption of diesel...
Occurrence, bionomics and harmfulness of Crepidodera aurata (Marsh.) (Coleoptera, Alticidae)
Jaroslav Urban
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 263-278 | DOI: 10.11118/actaun201159050263
Flea-beetle Crepidodera aurata (Marsh.) is a forestry-important species of the family Alticidae. Its occurrence, bionomics and harmfulness were studied at Forest District Bílovice nad Svitavou (Training Forest Enterprise Masaryk Forest Křtiny near Brno) in the period 2007 to 2010. Salix caprea L. was the main host and Populus tremula L. an additional host. Last year's beetles occurred on woody species from the beginning of May to mid-October (most abundantly in June). In the laboratory, they lived 2 to 2.5 months and damaged on average 19.1 cm2 leaves S. caprea. Females laid on average 246.5 eggs, namely in 15.4...
Occurrence, bionomics and harmfulness of Crepidodera aurea (Geoffr.) (Coleoptera, Alticidae)
Jaroslav Urban
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 279-308 | DOI: 10.11118/actaun201159050279
The paper deals with the occurrence, bionomics and harmfulness of a flea-beetle Crepidodera aurea (Geoffr.) (Alticidae). The pest was studied at the Bílovice nad Svitavou Forest District (Training Forest Enterprise Masaryk Forest in Křtiny) in the period 2007 to 2010 and in a laboratory. The main host species Populus tremula was about five times more damaged there than Salix caprea. Last year's beetles occurred on the trees from the beginning of May to the beginning of November (most abundantly at the beginning of June). This year's (young) beetles occurred from the end of July to the 10th of November (most abundantly...
The effect of seed age and treatment by Proradix method on germinability and initial growth of selected meadow grass (Poa pratensis) varieties
Jana Vrzalová, Pavel Knot
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 309-314 | DOI: 10.11118/actaun201159050309
The goal of the study conducted in 2008 and 2010 at the Research Forage Production Station in Vatín was to investigate the influence of seed age and seed treatment by Proradix method on the germination dynamics, total germinating capacity and initial growth rate of selected meadow grass varieties. The testing was carried out in controlled conditions on the germinator. Our results indicate that the age of seed significantly affects both the germination dynamics and the total germinating capacity. On day 7 after the establishment of the trial, a significantly higher germinating capacity was observed in the 4-year old seed (33.3%) as compared with the...
Effect of lactation stage, its number, current milk performance and barn air temperature on laterality of Holstein dairy cows laying behaviour
Petra Zejdová, Daniel Falta, Gustav Chládek, Ladislav Máchal
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 315-322 | DOI: 10.11118/actaun201159050315
The aim of this study was to determine effect of lactation stage and number, current milk performance and ambient temperature on laterality of dairy cows laying behaviour (i.e. preference of either left or right body side). The monitoring was performed at the University Training Farm in Žabčice, Czech Republic, (geographical coordinates 49° 0'4'' N and 16° 36' E, the altitude 179 m) within the six warmest months of the year 2010 (i.e. from 1 April 2010 to 30 September 2010). Observed were altogether 70 Holstein dairy cows with the average daily milk production of 34.48 kg of milk, which were kept in loose housing boxes with bedding (size of boxes:...
Usage of hydrocolloids in cereal technology
Ľubomír Mikuš, Ľubomír Valík, Ladislav Dodok
Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 325-334 | DOI: 10.11118/actaun201159050325
Hydrocolloids are high-molecular-weight polymer substances soluble in water which create viscous colloidal solutions. They are mainly used to influence functional properties of food (structure, texture, etc.), improving their properties during production (bigger dough volume, better dough manipulation - better adhesion), increasing stability, maintaining taste firmness in frozen products and prolonging durability of cereal products in food industry.Hydrocolloids are characteristic for their thickening effect and are used for their emulsifying and steadiness properties. The aim of this review is to provide useful information about hydrocolloids...