Fulltext search in archive
Results 421 to 450 of 638:
Evaluation of harvest losses within a full mechanised grape harvestPavel Novák, Patrik BurgActa Univ. Agric. Silvic. Mendelianae Brun. 2013, 61(3), 751-756 | DOI: 10.11118/actaun201361030751 |
Success factors of agricultural companyHelena ChládkováActa Univ. Agric. Silvic. Mendelianae Brun. 2013, 61(4), 935-940 | DOI: 10.11118/actaun201361040935 |
Vztahy mezi respirací, kvalitou humusu a kationtovou výměnnou kapacitou u vybraných subtypů černozemí jižní MoravyJiřina Foukalová, Ľubica Pospíšilová, Martin JančekActa 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. |
HYDROBIOLOGICKÁ STUDIE ŘÍČKY BOBRAVYIvo SukopActa Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(2), 175-180 | DOI: 10.11118/actaun200856020175 The qualitative and quantitative composition of macrozoobenthos in the Bobrava rivulet was summarized utilizing former and recent studies. Altogether, 187 taxa of macrozoobenthos were determined in the Bobrava rivulet and its tributaries until now. The highest values of macrozoobenthos were found on the stony substrate with mean values of biomass and density corresponding to 18.7 g.m-2 and 2922 ind.m-2, respectively. Lower values were determined on the muddy and sandy substrates with 12.4 g.m-2 and 1587 ind.m-2, and 4.2 g.m-2 and 531 ind.m-2, respectively. The index of saprobity upstream the town Rosice corresponded to oligo-betamesosaprobity. Downstream the towns of Rosice, Omice and Radostice on the middle course of the Bobrava rivulet, water duality declined to beta - to alphamesosaprobity. Due to the self-purification ability of the stream, its water quality was improved to beta-mesosaprobity bellow the municipal pollution sources in the river stretch between localities Závist and Želešice. |
SUBJEKTIVNÍ HODNOCENÍ VÝZNAMNOSTI VYBRANÝCH TYPOGRAFICKÝCH VLASTNOSTÍ MARKETINGOVÝCH MATERIÁLŮPetra Talandová, Jiří RybičkaActa 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. |
Vyhodnocení některých ukazatelů pitné vody ve vybraných, různě hospodařících chovech dojnic v České republiceVáclava Genčurová, Oto Hanuš, Libor Janů, Antonín Macek, Marcela VyletělováActa Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(4), 57-76 | DOI: 10.11118/actaun200856040057 The paper evaluates drinking water quality on selected dairy farms on the territory of the Czech Republic. The drinking water samples were collected in the farm milk storage rooms of 30 farms with subsequently made analyses. The pre - selected chemical and microbiological indicators were stated according to the regulation No. 252/2004 Coll. (pH, conductivity, chemical oxygen demand, colour, turbidity, Fe, ammonia ions, nitrites, nitrates, colony count growing at 36 °C, colony count growing at 22 °C, coliform bacteria, Escherichia coli, Ca, Mg, Na, K, Zn, Cu, Mn, Pb, Cr and Ni). The statistical evaluation was performed in the obtained data file and these data were compared with the limit values given by the regulation. The nitrate content ranged between 1 and 40.7 mg L-1 with an average of 15.6 mg L-1. The pH values varied from 5.71 to 8. The chloride concentration geometrical means was 7.57 mg L-1. The Ca average concentration 58.5 mg L-1 was in the middle of the recommended interval 40-80 mg L-1. The geometric means in Mg content was 7.9 mg L-1 being under the recommended value 20-30 mg L-1. The Cu, Pb, Cr and Ni limit values were not exceeded. The limit values in microbiological analyses were exceeded 18x in coliform bacteria, 10x in enterococci, 5x in Escherichia coli. The microbiological colonies growing at 36 °C exceeded limit 9x, those growing at 22 °C 5x. |
VLIV VÝUKY NA VNÍMÁNÍ VYBRANÝCH TYPOGRAFICKÝCH VLASTNOSTÍ DOKUMENTŮPetra Talandová, Jiří RybičkaActa Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(6), 189-198 | DOI: 10.11118/actaun200856060189 This paper concentrates on the problems of documents quality evaluation and perception. It presents the results of our own research which was made at our faculty in last months. The research was aimed at marketing materials, their quality and their evaluation by customers. After another comparative research we have concentrated on the question of typography and its evaluation by customers. It has been proved that typography, although not very visible for many readers, does influence readers' evaluation of the whole document. |
Columnar apple trees and their varietiesLibor Dokoupil, Vojtěch ŘezníčekActa Univ. Agric. Silvic. Mendelianae Brun. 2012, 60(8), 37-48 | DOI: 10.11118/actaun201260080037 |
Evaluation of employee training in retail businessJana StehlíkováActa Univ. Agric. Silvic. Mendelianae Brun. 2012, 60(2), 375-378 | DOI: 10.11118/actaun201260020375 |
Vliv redukce listové plochy na výnos a kvalitu cukrovky (Beta vulgaris L. var. altissima Döll)Radim Cerkal, Jan Dvořák, Karel Vejražka, Jiří KamlerActa Univ. Agric. Silvic. Mendelianae Brun. 2007, 55(5), 37-44 | DOI: 10.11118/actaun200755050037 The yield of sugar beet is directly affected by LAI (leaf area index) and values of LAD (leaf area duration). The integral leaf area plays, except for other factors, an important role during the damage or reduction of leaf apparatus. There are many sources of leaf damage: natural disasters (hailstorm), diseases, pests (including game browsing) etc. The intensity of the root production and quality differs in relation to the growth stage of the damage plant. The aim of this study was to evaluate the extent of losses in the root yield and the quality of sugar beet upon gradual reduction of the leaf area. Two diploid varieties Monza and Compact were used in the small-plot trials conducted in years 2004 to 2006 (in the experimental station Žabčice - maize production region, zone K2, average altitude 184 m, soil type was classified as gley fluvisoil, soil is medium heavy to heavy, clay-loam to loam type). The leaf area was manually reduced by 25% and 50% at BBCH 18-19 growth phase (8-9 leaves unfolded). The results were statistically evaluated by analysis of variance and testing by Tukey test (at the significance level α = 5%). Reduction of the leaf area was reflected on the decrease of the root yield by 1 to 10% depending on the year of harvest. In addition, the stressful state of the plants after defoliation resulted in the decrease of the yield of polarization sugar per hectare, namely by 0.45 to 1.66 t.ha-1. In 2005, the leaf area reduction caused a rise of the α-amino nitrogen content. The rise in the potassium and sodium cations content caused by the leaf area reduction also increased the sugar content in the treacle (by 0.1 to 0.16%). The increasing leaf area reduction lead to decreasing of yield of polarization sugar. However, this descent was statistically significant in harvest year 2006 only. |
A study of potential output and output gap in the Czech RepublicVáclav Adamec, Luboš StřelecActa Univ. Agric. Silvic. Mendelianae Brun. 2012, 60(2), 9-16 | DOI: 10.11118/actaun201260020009 |
Vliv uhelných popelů na úroveň výnosu a kvalitu kukuřice. Část 1. Těžké kovy.Jacek Antonkiewicz, Tomáš LošákActa Univ. Agric. Silvic. Mendelianae Brun. 2007, 55(1), 7-16 | DOI: 10.11118/actaun200755010007 The studies aimed at identification of various ash doses effect on the amount of yield and concentrations of Cr, Zn, Pb, Cu, Cd and Ni in maize. The studies were conducted as a pot experiment on mineral soil, to which ash doses of between 13.33 and 800.0 g∙pot-1 were supplied in proportions corresponding to quantities between 10 and 600 t∙ha-1. The amount of maize yield was diversified and depending on the treatment ranged between 35.59-121.64 g d.m.∙pot-1. Ash dose of 13.33 g.pot-1 significantly affected an increase in maize yield, while the dose over 26.67 g.pot-1 and equivalent to over 20 t.ha-1 applied to the soil markedly declined maize yield. Element concentrations in maize was diversified, depending on the treatment and plant part, and fluctuated from 0.32-3.48 mg Cr; 13.45-341.19 mg Zn; 0.50-5.02 mg Pb; 1.83-22.10 mg Cu; 0.02-1.71 mg Cd and 0.15-6.07 mg Ni∙kg-1d.m. It was found that with increasing ash dose Cr and Cu content increased systematically, whereas Zn, Pb, Cd and Ni concentrations in maize decreased. The content of investigated heavy metals in maize aboveground parts fulfilled the norms for good quality fodder. Under the influence of growing ash doses added to the soil a regularly declining Cr, Zn, Pb, Cd and Ni uptake by maize aboveground parts was observed. |


