Plant, Soil and Environment, 2002 (vol. 48), issue 7
Physiological nature of overwintering oats forms
J. Petr, I. Capouchová, M. Štolcová
Plant Soil Environ., 2002, 48(7):285-292 | DOI: 10.17221/4371-PSE 
We evaluated the need for low temperatures (vernalization) and the photoperiodic reaction of three collections of winter oats (1. Pedarn, Maris Quest, Peniarth; 2. Gerald, Solva, Kymon, Pendragon; 3. Pewi, Silwi, Wiskas) in a comparison with spring oats varieties. All three collections of varieties showed little need for low temperatures, mostly as few as 10-20 days, which does not represent an obligatory need; this influence is only quantitative and constitutes no precondition for a passage of plants into the generative stage. Only in the case of the Maris Quest variety, the need for vernalization approached 30 days. As compared with the reaction...
Barley seed sensitivity to water stress at germination stage
V. Hosnedl, H. Honsová
Plant Soil Environ., 2002, 48(7):293-297 | DOI: 10.17221/4370-PSE
Barley seed sensitivity to water and anoxia was tested. Standard germination, mean time of germination (MTG), germination in sand wetted by water to 100% water capacity (anoxia) or by hydrogen peroxide (wet conditions without anoxia), germination in 0.75% hydrogen peroxide and laboratory emergence (15 and 20°C) were evaluated. Barley seed responds sensitively to stress conditions during germination. Significant germination decrease was found in abundance of water. Percentage of reduction depends on the variety and on the year of seed production. Extreme values of water sensitivity are in interval 4-90%. At wetted sand by 0.75%, solution of H2O2...
The effect of leaf area index on potatoes yield in soils contaminated by some heavy metals
M. Jůzl, M. Štefl
Plant Soil Environ., 2002, 48(7):298-306 | DOI: 10.17221/4369-PSE
A method of growth analysis was used to evaluate the yield results in experiments conducted during years 1999-2001 on School co-operative farm in Žabčice. In sequential terms of sampling from two potato varieties with different duration of growing season, the effect of leaf area index (L, LAI), on yield of tubers in soils contaminated by cadmium, arsine and beryllium, was evaluated. From a growers view the phytotoxic influence on development of assimilatory apparatus and yields during the growth of a very-early variety Rosara and a medium-early Korela were evaluated. These varieties were grown under field conditions in soils contaminated by graded...
The effect of nitrogen fertilization, sowing rates and site on yields and yield components of selected varieties of safflower (Carthamus tinctorius L.)
Z. Strašil, Z. Vorlíček
Plant Soil Environ., 2002, 48(7):307-311 | DOI: 10.17221/4368-PSE
Field trials were conducted at two sites Troubsko near Brno and Prague-Ruzyně in 1996-1999 with three varieties of safflower (Gila, CW-74, Sironaria). Three rates of nitrogen fertilization were used: N0 = no fertilization, N1 = 40 kg/ha, N2 = 80 kg/ha. Sowing rates were 50 and 70 germinable seeds per m2. The average values of oil content were highest in seeds of CW-74 variety (27.2%). Gila had on average the lowest oil content (24.5%). Linoleic acid was dominant in all three safflower varieties. Variation in content of linoleic acid in different years was not so high as in oil content. The highest average content of linoleic acid...
Induction of resistance to root rot disease of wheat grown under field condition
M. Hashem, A.M. Hamada
Plant Soil Environ., 2002, 48(7):312-317 | DOI: 10.17221/4372-PSE
Four compounds namely Fenor (F-760), Strom, salicylic acid (SA) and thiamin (B1) were tested against root rot disease of wheat under field condition. Wheat grains were soaked in these compounds for 6 h before sowing. Mean disease rating, disease appearance, and distribution of disease were estimated as parameters of disease severity. All tested compounds significantly reduced the root rot of wheat severity during seedling, flowering and ripening stages. Fresh and dry weights were also affected by application of these compounds. Water maintenance capacity in all stages was increased as a result of seed treatments by the above-mentioned compounds. Crop...
Identification of sex in F1 progenies of hop (Humulus lupulus L.) by molecular marker
J. Patzak, P. Vejl, S. Skupinová, V. Nesvadba
Plant Soil Environ., 2002, 48(7):318-321 | DOI: 10.17221/4367-PSE
Sex identification for hop (Humulus lupulus L.), which is a dioecious plant, is very important for breeding process. The use of molecular methods for marker-assisted selection (MAS) provides rapid and reliable identification of sex in F1 progenies. In the first, we proved the use of specific PCR molecular marker for evaluation of sex in selected plants. This marker was not amplified in 3 from 35 male plants. In the next, we successfully analysed 770 genotypes of F1 progenies of three crossings. The amplified differences were found in 4 male plants of crossing Sm01 H28, 8 male plants of crossing Sm01 H29 and 5 female plants...
To contemplate quantitative and qualitative water features by neural networks method
M. Neruda, R. Neruda
Plant Soil Environ., 2002, 48(7):322-326 | DOI: 10.17221/4375-PSE
An application deals with calibration of neural model and Fourier series model for Ploučnice catchment. This approach has an advantage, that the network choice is independent of other example's parameters. Each networks, and their variants (different units and hidden layer number) can be connected in as a black box and tested independently. A Stuttgart neural simulator SNNS and a multiagent hybrid system Bang2 developed in Institute of Computer Science, AS CR have been used for testing. A perceptron network has been constructed, which was trained by back propagation method improved with a momentum term. The network is capable of an accurate forecast...
Jednotná klasifikace půd
J. Němeček
Plant Soil Environ., 2002, 48(7):327-328 | DOI: 10.17221/4373-PSE