Plant, Soil and Environment, 2007 (vol. 53), issue 6
Soil conditions and evolution of aluminium resistance among cultivated and wild plant species on the Island of Madeira
J.F.T. Ganança, I. Abreu, N.F. Sousa, R.F. Paz, P. Caldeira, T.M.M. Dos Santos, G. Costa, J.J. Slaski, M.Â.A. Pinheiro De Carvalho
Plant Soil Environ., 2007, 53(6):239-246 | DOI: 10.17221/2218-PSE 
Soil samples collected from different soil formations throughout the Island of Madeira were analysed for pH, aluminium (Al) and organic matter content. On average, the Madeira soils appeared to be acid with a mean pH of 5.01, containing 0.79 cmol/kg of ionic Al and 3.02% organic matter, which may create favourable conditions for the development of Al resistance among plant species inhabiting the island. Six plant species were evaluated for their resistance to Al using the erichrome cyanine R tests: three agricultural species including wheat (Triticum aestivum L. and Triticum turgidum L.) and corn (Zea mays L.) and three wild species...
Changes in the content of glycoalkaloids in potato tubers according to soil tillage and weed control methods
K. Zarzecka, M. Gugała
Plant Soil Environ., 2007, 53(6):247-251 | DOI: 10.17221/2221-PSE
A field experiment was carried out in the fields of the Experimental Farm in Zawady owned by the University of Podlasie in Siedlce. An influence of soil tillage methods and herbicides application on the content of glycoalkaloids in edible potato tubers of the Viking cultivar was studied. The results obtained indicated that the content of glycoalkaloids in non-peeled tubers significantly depended on the method of soil tillage and weed control as well as on the research year, whereas in peeled tubers the content significantly depended only on the weather conditions in the growing season. The content of glycoalkaloids in the tubers subjected to the initial...
Effect of conditions of locality, variety and fertilization on the content of ascorbic acid in potato tubers
K. Hamouz, J. Lachman, P. Dvořák, O. Dušková, M. Čížek
Plant Soil Environ., 2007, 53(6):252-257 | DOI: 10.17221/2217-PSE
The effect of conditions of locality, variety and fertilization on ascorbic acid (AA) content in potato tubers was investigated in precise field trials in 2004 and 2005 in the Czech Republic. From four localities and in the two-year average the highest AA was statistically determined in the locality of Prerov nad Labem with the highest average temperature values during both experimental years (by 6.7 to 11.5% higher in comparison to other localities). Similarly, the effect of variety was also very significant; Marabel variety had the highest AA content (207.2 mg/kg fw) and exceeded other seven varieties by 15-49%. A negative effect on AA content in...
Effects of liming and nitrogen application on the trace element concentrations of pastures in low mountain range
H. Laser
Plant Soil Environ., 2007, 53(6):258-266 | DOI: 10.17221/2222-PSE
In less intensively managed grassland, the micronutrient concentrations in herbage are apparently more likely to be in levels between barely sufficient and deficient than to be excessively high. Insufficient amounts of selenium, copper, manganese, and zinc cause physiological disorders in ruminants. Three identical field trials on pastures with different soil pH and organic matter content were established to assess the effect of liming and nitrogen fertilization on the micronutrient concentrations in herbage. In the case of selenium the effect of a selenate application on the Se concentration in plants was also tested. The effect of liming on the micronutrient...
Causal pathways when independent variables are co-related: new interpretational possibilities
M. Kozak, M.S. Kang, M. Stępień
Plant Soil Environ., 2007, 53(6):267-275 | DOI: 10.17221/2220-PSE
We propose a novel interpretation in classical path analysis, whereby the influence of k independent variables on a dependent variable can be analyzed. The approach should be useful to study a causal structure with the assumption that this structure is true for the situation investigated. We propose a new coefficient, Qi, which provides a better interpretation of classical path analysis. We provide an example in which effects of certain soil properties on grain yield of winter rye (Secale cereale L.) were examined.
Influence of plantation row spacing on quality and yield of hops - Information
J. Kořen
Plant Soil Environ., 2007, 53(6):276-282 | DOI: 10.17221/2219-PSE
In 2004-2006 an influence of various plantation row spacings on yield and quality of hops was observed in field trials. A hybrid variety Agnus was selected for this purpose. The common space between the rows remained (300 cm). The tested distances of individual hop plants within each row amounted to 114 and 133 cm. We compared the standard kind of four trained bines from each hill with a new one (five bines per hill). The yield of hops was the highest if row spacing 300 × 114 cm was used (2.80 tons of dry hops per hectare). If spacing 300 × 133 cm was tested, the yield amounted to 2.69 t/ha. The lowest yield of hops was obtained when the common row...