Plant, Soil and Environment, 2005 (vol. 51), issue 10
The effect of selected factors on the content of protein and nitrates in potato tubers
J. Lachman, K. Hamouz, P. Dvořák, M. Orsák
Plant Soil Environ., 2005, 51(10):431-438 | DOI: 10.17221/3614-PSE 
The aim of the study was to determine the effect of region, variety, year and ecological and conventional way of cultivation on the content of total protein and nitrates in potato tubers in three-year field trials. The effects of selected factors on nitrate and protein contents were similar, more significant for nitrates. Growing regions, varieties and years of cultivation caused statistically significant effects whereas the effect of ecological way of cultivation was less pronounced and showed a tendency without significance. Higher region showed lesser average nitrate (113.4 mg/kg) and protein content (4.27% dry matter) in comparison with lower region...
Microbial biomass-C determined using CaCl2 and K2SO4 as extraction reagents
L. Růžek, M. Nováková, K. Voříšek, I. Skořepová, L. Vortelová, Z. Kalfařová, J. Černý, T. Částka, W. Barabasz
Plant Soil Environ., 2005, 51(10):439-446 | DOI: 10.17221/3615-PSE
Microbial biomass-C [MBC] was determined by re-hydration [RHD] technique using two very similar salt solutions in dissociation potency (0.5 mol/l K2SO4 [MBC-K] and 0.01 mol/l CaCl2 [MBC-Ca]) in forest, grassland, arable Cambisols [Inceptisols] and Podzols [Spodosols]. MBC-Ca ranged from 254 to 5076 mg/kg dry soil (1.2-4.0% of Corg). 114 soil samples were examined in the years 2002 and 2003. Organic C compounds extracted by 0.5 mol/l K2SO4 [EC-K] and 0.01 mol/l CaCl2 [EC-Ca] increased in sequence: (1) arable Cambisols (100%), (2) cut and grazed grasslands (547%), (3) forest...
Factors of spatial distribution of forest floor properties in the Jizerské Mountains
L. Borůvka, L. Mládková, O. Drábek, R. Vašát
Plant Soil Environ., 2005, 51(10):447-455 | DOI: 10.17221/3616-PSE
The aim of this contribution was to describe spatial distribution of soil characteristics of forest floor in the JizerskéMountainsregion and to assess the effect of stand factors by means of geostatistics, using structural correlation coefficients. Most soil properties showed a low spatial dependence with variogram range of 6000 m. Kriged maps of spatial distribution of soil properties were created. Most characteristics were influenced by altitude. A general decrease of pH and Ca and Mg content and an increase of potentially toxic Al forms (AlKCl) due to high S and N loading were demonstrated. An effect of liming on the decrease of AlKCl...
Mercury and methylmercury in plants from differently contaminated sites in Slovakia
R. Dombaiová
Plant Soil Environ., 2005, 51(10):456-463 | DOI: 10.17221/3617-PSE
Concentrations of methylmercury (MeHg) and total mercury (Hgtotal) were investigated in green leaves of herbs, deciduous and coniferous trees in 9 sites in Slovakia (the transect Žiar nad Hronom - Vtáčnik, Banská Štiavnica, Rudňany). There was evaluated the relevance of plant uptake and the behaviour of transfer-factors. The MeHg and Hgtotal in leaves of plants from the contaminated sites in Rudňany (up to 3.21 and 802 ng Hg/g, respectively) were an order of magnitude larger than those from other sites, reflecting the strong Hg contamination in Rudňany's plants. The MeHg and Hgtotal concentrations in leaves (up to 0.285...
Polychlorinated dibenzo-p-dioxines and dibenzofurans in agricultural soils of the Czech Republic
R. Vácha, M. Vysloužilová, V. Horváthová
Plant Soil Environ., 2005, 51(10):464-468 | DOI: 10.17221/3618-PSE
The set of 102 samples of agricultural soils was taken for the study of the load of agricultural soils with polychlorinated dibenzo-p-dioxins and dibenzofuranes (PCDDs/Fs). The background value of PCDDs/Fs in agricultural soils of theCzech Republicwas determined. The soils with different sources of the load of PCDDs/Fs were compared. It was concluded that fluvisols in fluvial zones and soils with long-term sludge application are soils with the highest contents of PCDDs/Fs. The soils affected by imission outputs show a lower intensity of the load with PCDDs/Fs that is characterised by higher content of toxic congeners.
Compounds of natural origin inducing winter wheat resistance to powdery mildew (Blumeria graminis f.sp. tritici)
L. Věchet, J. Martinková, M. Šindelářová, L. Burketová
Plant Soil Environ., 2005, 51(10):469-475 | DOI: 10.17221/3619-PSE
In laboratory and small-field experiments inducers of synthetic origin: benzothiadiazole (BTH), salicylic acid, and inducers of biological origin: glycine betaine, extracts prepared from oak bark (Quercus robur L.), Reynoutria sacchaliensis L., curcuma (Curcuma longa L.), ginger (Zingiber officinale Roscoe) were effective against powdery mildew on the winter wheat (cv. Kanzler) susceptible to this disease. All studied inducers slightly effected the synthesis of new proteins (PR-proteins) that were localized in extracellular space. The efficacy of inducers was long-term. The most effective inducer was BTH; its application...