Plant, Soil and Environment, 2002 (vol. 48), issue 5
Critical values of trace elements in soils from the viewpoint of the transfer pathway soil - plant
E. Podlešáková, J. Němeček, R. Vácha
Plant Soil Environ., 2002, 48(5):193-202 | DOI: 10.17221/4224-PSE 
The development of soil limiting values of the protection of the quantity and mainly quality of the crop production tends from empiric values towards critical values, based on ecotoxicity. We present an attempt to derive transfer functions by the means of multiple regression analysis. The substitution of trace elements contents in crops in the prediction equations for fodder or food standards or phytotoxicity limits satisfies the present ecotoxicological demands. We preferred polyfactor relations to simple ones. The exceeding of reference values must be verified by the determination of the hazardous transfer in the field. Therefore the reference values...
Effects of kaolinite and drying temperature on the persistence of soil water repellency induced by humic acids
Ľ. Lichner, N. Babejová, L.W. Dekker
Plant Soil Environ., 2002, 48(5):203-207 | DOI: 10.17221/4225-PSE
The effects of kaolinite additions and drying temperature on the persistence of soil water repellency, induced by humic acids from peat, were assessed in this study. It was found that additions of 5 and 10% kaolinite (referred to as the most effective material in combating the water repellency) did not result unambiguously in a decrease of the persistence of water repellency. In case of the higher humic acids contents, an increase of the persistence of water repellency was even noticed in comparison with the samples without kaolinite. Establishment (re-establishment) of water repellency was observed for the samples wetted to 30% after drying at temperatures...
Influence of different cultivation factors on the yield structure and on changes of soil properties
F. Vrkoč, M. Vach, V. Veleta
Plant Soil Environ., 2002, 48(5):208-211 | DOI: 10.17221/4227-PSE
The monitoring was carried on in the years 1996-2000 in the polyfactorial P-A field trial in Lukavec, Pelhřimov district. The given locality is characterized by low fertility sandy-loamy cambisoils, by long-term average annual rainfall of 653 mm, by average annual temperature of 7°C and its altitude is 620 m. The field trial included different organic fertilizations; graduate N-doses, different soil tillage as well as different forecrops. It manifested in this group of field trials that the forecrop value of red clover and dung manured potatoes before winter wheat was practically the same in the given locality. The optimal N dose for potato yields...
Influence of different organic mineral fertilization on the yield structure and on changes of soil properties
F. Vrkoč, M. Vach, V. Veleta, J. Košner
Plant Soil Environ., 2002, 48(5):212-216 | DOI: 10.17221/4228-PSE
The monitoring was carried on in the years 1996-2000 in the international IOSDV (Internationale Ökologische Stickstoff Dauer Versuche) field trial running since 1983 in Lukavec, Pelhřimov district. In the given locality, there are low fertility sandy-loamy cambisoils, long-term average annual rainfall 653 mm, average annual temperature 7°C, altitude 620 m. In the field trials there were introduced different organic fertilizations and graduate N-doses. According to the complex diffusion analysis, statistically significant for the yields of winter wheat after potatoes was the impact of N fertilization, years, and double interactions, with the exception...
Selections from barley landrace collected in Libya as new sources of effective resistance to powdery mildew (Blumeria graminis f.sp. hordei)
J.H. Czembor, H.J. Czembor
Plant Soil Environ., 2002, 48(5):217-223 | DOI: 10.17221/4229-PSE
Powdery mildew on barley (Hordeum vulgare L.) caused by the pathogen Blumeria graminis f.sp. hordei occurs worldwide and can result in severe yield loss. Because agronomical methods to control the disease are not completely effective, cultivars with genetic resistance are needed. Therefore, there is a need to describe new sources of genes that confer resistance to barley powdery mildew. This study was conducted to determine the genetic basis of resistance to powdery mildew in three selections 995-1-1, 995-1-2, 995-1-3 from barley landrace 995 (ICB 112840) collected in Al Aziziyah district, Tripolitania, Libya. Landrace originated...
The determination of coumestrol in alfalfa (Medicago sativa) by capillary electrophoresis
J. Moravcová, T. Kleinová, R. Loučka
Plant Soil Environ., 2002, 48(5):224-229 | DOI: 10.17221/4230-PSE
High performance capillary electrophoresis (HPCE) on an uncoated fused-silica capillary column using a borate buffer at pH 9.2 as electrolyte and diode-array detection was developed for the determination of coumestrol in alfalfa. The linear detector response was established in the concentration range 0.76-140 mg.dm-3, the minimum detectable limit was 0.39 mg.dm-3, and migration time of coumestrol was 5 min. 3-Isobutyl-1-methylxanthin was used as an internal standard. Coumestrol was isolated by acid extraction employing a mixture hydrochloric acid-acetonitrile at 95°C for 30 min followed by solid phase extraction. Relative standard...
Variability of grain yield components of some new winter wheat genotypes (Triticum aestivum L.)
M. Sabo, M. Bede, Ž.u. Hardi
Plant Soil Environ., 2002, 48(5):230-235 | DOI: 10.17221/4231-PSE
Variability of grain yield components of some new winter wheat genotypes (e.g. Lara, Lenta, Kruna, Fiesta, Perla, and one line of AG-45) was examined. The analysis of grain yield components of these genotypes and the line was undertaken in a two-year research (1997/1998 and 1998/1999) at two different locations. Significant differences among genotypes, locations and research years were established. In the first experimental year (1997/1998) there was a high positive correlation between nearly all components of the grain yield. The most significant correlation was found between the grain number per spike and grain yield. In the second experimental year...