<abstract xmlns="http://www.w3.org/1999/xhtml">The aim of this study was to analyse sediments of the selected water reservoirs of Piargs group. Secondly, our purpose was to determine values of exchange reactions in soil of these sediments during the period from 2001 to 2010 and to evaluate environmental hazards caused by the selected potentially toxic elements affected by pH. Based on the results gained by analysis we aim to determine the correlation and statistical significance of dependencies of the analysed environmental parameters. Two different methods, the flow electrochemical method and the atomic absorption spectrometric method have been used to analyse the content of potentially toxic chemical elements in leachate. The analysis of leachate samples, in order to find out the values of exchange reactions in soil, was carried out by potentiometry. Ascertained values of exchange reactions in soil ranged from 5.6 to 7.2. According to the calculated indices of dependencies, the development of pH/KCl values can be evaluated as moderately dynamic. The calculated indices of the Spearman‘s correlation coefficient for exchange reactions in soil demonstrate statistically significant dependence, especially for zinc and cadmium.</abstract>

Evaluation Of Exchange Reaction In Soil In Sediments Of A Region Affected By Anthropogenic Activity In Relation To The Time And To The Selected Potentially Toxic Elements

<abstract xmlns="http://www.w3.org/1999/xhtml">The activities of the Dendrological Society in Průhonice have significantly influenced the introduction of woody plants into the territory of today‘s Czech Republic. This is evidenced by a significant handwritten document – The Register of plants of the Dendrological Society that records the introduction period between 1909 and 1924 (10,050 items). The collections of seeds (plants) from E. Taquet, H. Shirasawa and J. Unger played an important role in the introduction of woody plants to Průhonice with over 157 taxa of woody plants from their collections being introduced between 1909 and 1912. From the total number of 157 taxa, 80 items were introduced to Průhonice before anywhere in the Czech lands. This work aims to provide a new knowledge acquired from studying the above-mentioned document, about the time and place of these introductions. A significant part of this work is a detailed overview of the particular woody species introduced to Průhonice.</abstract>

The Contribution Of E. Taquet, H. Shirasawa And J. Unger To The Introduction Of Woody Plants To Průhonice

<abstract xmlns="http://www.w3.org/1999/xhtml">In this study, the number of stomata per unit area was determined in the perennial energy grass of two genotypes <italic>Miscanthus</italic> × <italic>giganteus</italic> (Greef et Deuter) and <italic>M. sinensis</italic> ‘Tatai’ on arable land in the South-western Slovakia. The dynamics of stomatal density per mm2 was determined by non-destructive method in three randomly selected clumps. The number of stomata per mm2 of area varied from 125 ±23 to 327 ±47, stomatal length ranged from 33.9 ±4.7 μm to 35.3 ±3.4 μm, and stomatal width ranged from 17.5 ±2.3 μm to 18.8 ±2.8 μm in the two genotypes. We confirmed ontogenetic heterogeneity of leaf area size and stomatal size parameters.</abstract>

Stomatal Density In Miscanthus Leaves

<abstract xmlns="http://www.w3.org/1999/xhtml">The paper represents a waste composition study that was conducted at the Mladosť dormitory of the Slovak University of Agriculture (SUA) in Nitra. The aim of the study was to determine the amount and composition of waste generated in the dormitory and to provide recommendations for enhancing the recycling rates and to improve the overall sustainability of waste management in the dormitory. The analysed solid waste was separated into organics, papers, plastics, glass, metals, cardboard beverage packaging (tetrapak), electronic waste (e-waste), and others. The estimated annual average quantity of waste generated per student of the dormitory is 38 kg. The composition of generated solid waste is as follows: paper (6%), glass (26%), plastic (9%), metal (4%), organic (28%), tetrapak (2%), e-waste (1%) and other waste (24%). Potential recycling rate of generated waste is 76%. Composting is the most sustainable method to convert organic waste into valuable compounds and to reduce the waste disposed into landfills.</abstract>

Composition Analysis Of Municipal Solid Waste At A University Dormitory

<abstract xmlns="http://www.w3.org/1999/xhtml">In the years 2013–2014 we evaluated changes in concentrations of chlorides and sulphates in waters of the National Nature Reserve Čičov oxbow depending on the time and place of sampling. Collections of samples were realized regularly at monthly intervals, always in the half of a month. Sampling sites were determined in order to assess the impact of natural and anthropogenic source of surface water quality. In order to evaluate the quality of surface water in the sampling sites by individual indicators, we used the values of the 90th percentile (P90), which was calculated from the measured values and then compared with their matching set of limit values referred to the Regulation of the Government of the Slovak Republic No. 269/2010 Coll. According to that Regulation, the recommended value for chlorides is 200 mg dm;; and for sulphates 250 mg dm−3. Based on the calculated values of 90th percentile (P90) of these indicators, we found out that the calculated characteristic values are lower.</abstract>

The Evaluation Of The Concentration Of Chlorides And Sulphates In Surface Water Of The National Nature Reserve Čičov Oxbow

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