Horticultural Science, 2002 (vol. 29), issue 3
Prediction of profitability of topworking in older apple orchards under contemporary economic conditions of the Czech Republic
V. Blažek, V. Falta, R. Vávra, V. Beneš
Hort. Sci. (Prague), 2002, 29(3):85-91 | DOI: 10.17221/4469-HORTSCI 
: In the Czech Republic, there is still a predominance of obsolete apple orchards that were established more than 15 years ago and that are not profitable under contemporary conditions. Typical features of these orchards are low or medium tree densities, freely growing semi-standard trees or hedgerows on semi-dwarf, or sometimes also on vigorous, rootstocks. The farmers are not always in a position to completely renovate them, and therefore they are interested in their topworking. The present paper studied the effectiveness of this measure under the current economic and market conditions of this country, using 3 types of orchards with different spacings...
Fruit weight, firmness and soluble solids content during ripening of Karešova cv. sweet cherry
J. Blažková, I. Hlušičková, J. Blažek
Hort. Sci. (Prague), 2002, 29(3):92-98 | DOI: 10.17221/4470-HORTSCI
Changes in fruit weight, firmness and soluble solids content during the ripening period of Karešova cv. Including relationships between these characteristics were studied in 1998-2001. These years differed from each other in the amount and distribution of rainfall and in the course of temperatures. The length of ripening period fluctuated from 14 to 21 days. An increase in average fruit weight during the ripening period was 0.1 g per day. The actual increase in fruit weight was in a close correlation with the amount of rainfall in a few previous days. After heavy rainfalls, above 40 mm, fruit weight increased by nearly 1 g within in a few days. In...
Effect of infection by viruses on vegetative and reproductive growth of sweet cherry on Damil and Inmil rootstocks
D. Andersone, H. Wustenberghs, N.C. Cook, J. Keulemans
Hort. Sci. (Prague), 2002, 29(3):99-104 | DOI: 10.17221/4471-HORTSCI
The effect of infection with Prunus necrotic ringspot virus (PNRSV) and Prune dwarf virus (PDV) on vegetative and reproductive growth of sweet cherry trees (Prunus avium L.) was investigated. Infected trees were smaller and the growth reduction was more severe in Lapins than in Sam; when trees were infected in the nursery (early) compared to an infection two years later in the orchard; and when trees were grafted on the dwarfing Inmil rootstock compared to the more vigorous Damil. Tree mortality after establishment in the orchard was not a problem and only one virus infected tree died during the 5-year observation period....
Production weight and its variability in 24 apricot genotypes over six years
Z. Vachůn
Hort. Sci. (Prague), 2002, 29(3):105-113 | DOI: 10.17221/4472-HORTSCI
Productivity and its stability were evaluated in a set of 24 apricot genotypes of the world collection and some promising new selections in 1994-1999. The productivity of most genotypes was higher than that of control variety Velkopavlovická LE-6/2. Genotypes with higher productivity in the years favorable for apricot productivity gave higher yields also in the years unfavorable for productivity. It was proved by a significantly close highly significant correlation (r = 0.64++). It is a reason for the necessary regulation of fruit set in highest-yielding varieties in the years favorable for apricot productivity when overproduction and undesirable...
Comparison of selected Swiss chard (Beta vulgaris ssp. cicla L.) varieties
R. Pokluda, J. Kuben
Hort. Sci. (Prague), 2002, 29(3):114-118 | DOI: 10.17221/4473-HORTSCI
Evaluation of 12 Swiss chard varieties (Beta vulgaris ssp. cicla L.) in field experiments was focused on the observation of morphological characteristics, yield and nutritional quality of leaves and stalks. The following mean parameters of all varieties were found: 86% field germination, plant weight 346 g, plant height 506 mm, stalk width 23 mm, 10 leaves per plant, and yield 35 t/ha. Mean content of vitamin C was 307 and 72 mg/kg of fresh matter (f.m.) in leaves and stalks, respectively. Potassium content was 4,198 and 4,848 mg, sodium amount was 2,101 and 966 mg, calcium content was 481 and 310 mg and finally magnesium content...
Genus Hyssopus L. - recent knowledge: A review
M. Jankovský, T. Landa
Hort. Sci. (Prague), 2002, 29(3):119-123 | DOI: 10.17221/4474-HORTSCI
The genus Hyssopus L. - the hyssop is a source of volatile oil whose constituents are sesquiterpene alcohols, many terpene carbonyl compounds and some acids. As documented by the cited data, volatile oil composition depends not only on the species but also on the variety, date of drug harvest and many external factors including the quality of plant nutrition. The paper summarizes the knowledge of literary sources published over ca. the last twenty years that dealt with the hyssop (Hyssopus officinalis L.); the aim is to stimulate the search for other possibilities of application of hyssop volatile oil in ecological agriculture and...