Horticultural Science, 2002 (vol. 29), issue 4
Specific productivity of selected apricot genorypes
Z. Vachůn
Hort. Sci. (Prague), 2002, 29(4):125-132 | DOI: 10.17221/4475-HORTSCI 
Specific productivity and some correlations between growth and productivity were evaluated in a set of 24 apricot (Prunus armeniaca L.) genotypes in 1994-1999. Even though the planting stock came from the same nursery, was of even age and on the same rootstock, the tree size of genotypes varied from planting to a permanent site. Differences in the tree size of genotypes slightly diminished over the six-year period, likely under the influence of uniform pruning used for all trees. Nevertheless, tree size evaluated from the area of stem cross-section can be considered as a genotype disposition. It is proved by a positive, highly significant...
Testing of wood hardiness to winter freezes in selections from progenies of Cerapadus × Prunus avium L. crosses
J. Blažková, I. Hlušičková
Hort. Sci. (Prague), 2002, 29(4):133-142 | DOI: 10.17221/4476-HORTSCI
Winter hardiness of genotypes pre-selected from Cerapadus × Prunus avium L. crosses was studied for 3 years (2000-2002) in comparison with clonal cherry rootstocks, presently grown in the Czech Republic using artificial freezing of the budwood applied just after the phase of deep dormancy. With a temperature drop to freezing, both the mean and the maximum rate of general frost injury was markedly increased. The greatest damage of the tested material (roughly at the level of LD 50 on the average) occurred after the application of combined low temperatures -25°C for 4 hours + -20°C for 66 hours. The results of laboratory tests were...
Elimination of weed influence through fruit thinning and fertilisation in apple tree plantings
V. Falta, M. Pražák, M. Hudský
Hort. Sci. (Prague), 2002, 29(4):143-147 | DOI: 10.17221/4477-HORTSCI
The objective of this research is to study the effect of two measures (fruit thinning and additional fertilisation - 222 kg calcium nitrate/hectare) compensating the negative influence of weeds (yield loss and reduction of growth) in plantings of Idared cv. In addition, the yield response of two other apple cultivars (Melrose, Gloster) to the exclusion of chemical weed control is discussed in this paper. The obtained results have shown that the differences between yields of individual variants of Idared cv. were smaller and not significant in the first year (2000) of experiment. In the second year (2001), the significant (= 0.05) yield loss (40%) was...
Ethanol content in cut roses at low oxygen atmosphere storage
J. Goliáš, F. Kobza
Hort. Sci. (Prague), 2002, 29(4):148-152 | DOI: 10.17221/4478-HORTSCI
Low oxygen atmosphere is beneficial for preservation of fresh cut roses. Flower tolerance to specific atmosphere yielding anaerobic products was determined. A suitable gas mixture of ULO conditions (0.8% oxygen and 0.1% carbon dioxide) was shown to lead to elevated ethanol production in tissues. The tissue ethanol content in ULO and RA atmosphere (21% oxygen and 0.03% carbon dioxide) was 300 mg/l and 6 mg/l, respectively. After the exposure to ULO conditions when the material was in air ventilation under cold storage, ethanol decreased to the trace concentration comparable with that at the beginning of storage. The oxygen stress caused only small fluctuations...
New technologies and improvement of nursery stock quality
P. Salaš
Hort. Sci. (Prague), 2002, 29(4):153-160 | DOI: 10.17221/4479-HORTSCI
This four years experimentation work was aimed at research on using various waste organic materials and especially timber bark in cultivation substrates as a substitute of peat. Sixty-four special isolated cultivation beds were established for this purpose, each of 4.8 m3 volume, in which 11 variants of substrates consisting of different proportions of different components in several replications were tested. Standard substrates Horticultural substrate B and RKS I. were used as controls. Another variant was used as a control for growing tests of plants in containers. All tested substrates were enriched with hydroabsorbent TerraCottem. In...
Influence of windrow composition on composting by a windrow turner
P. Zemánek
Hort. Sci. (Prague), 2002, 29(4):161-164 | DOI: 10.17221/4480-HORTSCI
A PKS 2,8 tractor-drawn compost windrow turner was used on three different types of compost windrows. The consistence 810, 654 and 354 kg/m3 and the change of profile sizes in given sections were monitored inclusive of the course on band-shaped windrows. The windrow turner operational speed and turning course were also observed. On the basis of the measured values, the windrow turner real performance was determined for each windrow that reached the values of 71-197 m3/h.