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1

Antagonistic relations of lead and cadmium with selected micronutrients

100%
Bystricka J., Tomas J.
Ochrona Środowiska i Zasobów Naturalnych
|
2009
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nr 41
2

Risk elements in soils of burdened areas of Eastern Slovakia

81%
Vilcek J., Hronec O., Tomas J.
Polish Journal of Environmental Studies
|
2012
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tom 21
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nr 5
Areal or pointed extension of soil contamination by risk elements was determined in samples from 47 locatoins of agricultural soils in "pollution-loaded" regions of eastern Slovakia during 2006 and 2008. These regions were primarily the areas of middle Spiš and northern Gemer, where soils were under long-term contamination by solid polluting elements containing risk elements. A source of contamination was metallurgical plants located in the broken terrain with unfavorable dispersion conditions. Risk elements Cd, Pb, Cu, Zn, Ni, Cr, and As were determined in the lixivium of Aqua regia and their accessible (mobile) forms in the lixivium of 1 mol∙dm⁻³ NH₄HNO₃. To consider the solubility of the risk elements the lixivium of 0.05 mol∙dm⁻³ EDTA (mobile and mobilizable forms) and the lixivium of 2 mol∙dm⁻³ HNO₃ (potentially releasable contents) was used. Ascertained contents of the risk elements in the lixivium of Aqua regia correspond with the results regarding risk elements that were obtained by reduction in the mixture of inorganic acids before 1990. Then values of the solid polluting elements containing risk elements were the highest. The results confirm the large areal character of soil contamination by Hg and As in the emission areals of metallurgical plants where the natural endegeneous geochemical abnormalities now exist. Extremely high values of Pb, Zn, and Cd in close proximity to the former shaft-furnace (without any possibility of dispersion) are the result of solid polluting elements from Pb, Sn, alloys and ZnSO₄ production facilities. A considerably larger area of contaminated soils by Cu is connected to refined flame furnace copper production and converters and its dispersion into the wider areas. Some isolated locations with Cd, Cu, Ni, Hg, and As excesses are connected to geological-petrographical conditions where polymetallic mineralizing of old environmental loads is characteristic. In the samples with high contents of risk elements in Aqua regia, there were also over limit values for accessible plant risk elements. In the sum of mobile and mobilizable forms with relatively the highest content of Cd (36.57%) and the lowest Cr (0.36%) were determined in the following decreasing order Cd > Pb > Cu > Ni > Zn > Cr. The relevant prevalence of risk elements in residual fractions is apparently connected to their emission origin from thermic processes as predominantly insoluble risk element oxids.
3

Comparison of seed longevity for thirty forest, grassland and weed species of the Central European flora: results of a seed burial experiment

81%
Csontos P., Kalapos T., Tomas J.
Polish Journal of Ecology
|
2016
|
tom 64
|
nr 3
We compared seed longevity of herbaceous species in three habitat types differing in stability. We hypothesized that seed longevity is the lowest for forest species (living in stable habitat), the highest for weeds, while species of xerothermic grasslands take an intermediate value. Ten species were selected from each of the three habitats with balanced representation of plant families among habitats. Seeds of the 30 species were deep buried at 65 cm depth, then replicates recovered after 1, 2, 3, 4 and 6 years, and germinated in an unheated greenhouse. Weeds expressed the highest germination rate (36.1% in average) exceeding forest (14.4%) and grassland species (10.2%) which did not differ significantly. The number of species with transient, short-term persistent and long-term persistent seed bank, respectively, was 1, 7 and 2 for grasslands; 1, 3 and 6 for forests; and 0, 1 and 9 for weeds. As expected, weeds possessed the highest seed longevity. Contrary to our assumption, low seed longevity was not the norm among forest understorey species, and seed longevity of xerothermic grassland species was not intermediate but the shortest one. Ecological background of differences between hypotheses and experimental results are discussed. First record on seed bank type is reported here for 12 species: Dianthus pontederae, Digitalis grandiflora, Ferula sadleriana, Hieracium sylvaticum, Inula ensifolia, Jurinea mollis, Lychnis coronaria, Saponaria officinalis, Scorzonera austriaca, Secale sylvestre, Stipa borysthenica, Verbascum lychnitis.
4

Compression and flow behaviour of cohesive powders

81%
Stasiak M., Tomas J., Molenda M., Muller P.
Electronic Journal of Polish Agricultural Universities. Series Agricultural Engineering
|
2009
|
tom 12
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nr 2
5

Influence of physicochemical properties of soil on Mn bioavailability

80%
Halasova M., Vollmannova A., Tomas J.
Biuletyn Magnezologiczny
|
2001
|
tom 06
|
nr 3
Manganese contents in various extracts (2 M HN03, 0.05 M EDTA and 0.01 M CaCl2) and total Mn content in soil samples of various soil types from 6 regions of Slovakia were determined. After simulated loading the Mn extraction in 2 M HN03 decreased in order Lgp > Hcf > Jc Chc > Lga > Rc. The same order was also in 0.05 M EDTA and 0.01 M CaCl2. The results showed that Mn extractability is significantly determined by physicochemical soil properties (soil reaction, humus content and quality). Acid soils with a low humic acid content and high fulvoacid content appeared to be the highest risk soils.
6

Suppression of possible phytotoxic Mn effects in a soil-plant system

80%
Vollmannova A., Tomas J., Halasova M., Lazor P.
Biuletyn Magnezologiczny
|
2001
|
tom 06
|
nr 4
In a pot trial with spring barley negative influence of increasing Mn doses applied in the form of MnS04 H20 to acid soil and partial elimination of Mn by changing soil reaction were confirmed. The results proved that manganese is potentially phytotoxic at about 1000 mg Mnkg-1 d.w. and that the risk of Mn input to the human food chain) could be reduced by soil liming.
7

Quantification of S ambient concentrations by sorption-cumulative method of the Slovac Republic in the Region of Upper Nitra

80%
Lazor P., Tomas J., Vollmannova A., Toth T.
Biuletyn Magnezologiczny
|
2001
|
tom 06
|
nr 4
Emission of sulphur compounds was absorbed from the atmosphere to an alkaline surface of a filter containing sodium carbonate in the region of Nitra - Malanta. Sulphates were determined by titration with ethanolic solution of Ba(C104)2. Results from January 1st - December 31st 1999 show that mean S02 concentrations at Nitra were 18.3 ug.m-3 S02 and 15.4 mg ■ m-2- d-1 SO2. The average (January 1st - December 31st 2000) value of area fallout was 11.6 mg m-2 d -1 S02 and the value of content concentration was 14.9 ug m-3 S02. The area fallout of emission of S is connected with the given meteorological situation (precipitation, average temperature, direction and speed of wind). The fact was confirmed by the results of our experiment.
8

The change in heavy metal content in soil profiles from various Slovak burden areas

71%
Arvay J., Harangozo L., Tomas J., Slavik M., Toth T.
Ochrona Środowiska i Zasobów Naturalnych
|
2013
|
tom 24
|
nr 2(56)
9

Potential antagonist Zn effect on faba bean (Faba vulgaris m.) contaminated by Pb and Cd

71%
Bystricka J., Tomas J., Toth T., Trebichalsky P., Kavalcova P.
Ochrona Środowiska i Zasobów Naturalnych
|
2013
|
tom 24
|
nr 2(56)
10

Utilization of ground magnesite rock as magnesium manure

71%
Tomas J., Lazor P., Vollmannova A., Toth T., Halasova M.
Biuletyn Magnezologiczny
|
2001
|
tom 06
|
nr 3
According to the valid STN, a semi-product is as a suitable manure containing magnesium and calcium after removing the fraction above 0.5 mm. On average, the semi-products and raw materials analysed contain 86.64% MgC03 and 8.30% CaC03, which corresponds to 46.46% MgO and 4.65% CaO. They are also suitable for organic agriculture, which demands sufficient contents of magnesium in farm products. An essential portion of magnesium is bound in carbonates, complemented by magnesium in silicate forms. The products have relatively high contents of manganese (1643,68 mg kg-1), although its mobilisable percentage is barely 0.3%. Other controlled microelements (Cu, Zn, Co) are also present in forms unsuitable for vegetables.
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