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The effect of BA on the flowering of Campanula persicifolia L. ‘Alba’ cultivated in an unheated plastic tunnel and in the field was examined. BA in the concentration of 100, 200, 400 mg∙dm⁻³ was applied on the leaf twice in both years of the experiment duration. Plants not treated with benzyladenine were used as a control. It was concluded, that cultivation of Campanula persicifolia L. ‘Alba’ in an unheated plastic tunnel causes growth of fewer inflorescence stems but of better quality than in the field. Application of benzyladenine in the concentration of 400 mg∙dm⁻³ in Campanula persicifolia L. cultivation in an unheated plastic tunnel results in an increased fresh weight of inflorescence stems and number of primary side stems. Application of benzyladenine in the concentration of 400 mg∙dm⁻³ is recommended for Campanula persicifolia L. cultivated in the field due to better branching in the first and second year of flowering. Application of benzyladenine in the concentration of 200 and 400 mg∙dm⁻³ on the leaf of Campanula persicifolia L. cultivated in the tunnel leads to the production of shorter inflorescence stems in the first and second year of flowering. In the field, only the older plants (in the second year of flowering) react similarly.
The study focused on the influence of benzyladenine (BA) on the flowering of Liatris spicata L.‘Alba’ cultivated for two years in an unheated plastic tunnel and in the field. Benzyladenine at a concentration of 0, 100, 200, 400 mgdm-3 was applied on the leaf twice during both years of the experiment. It was noted that cultivation of Liatris spicata L.’Alba’ in an unheated plastic tunnel leads to the growth of longer inflorescence stems with a bigger fresh weight and a larger number of primary shoots. However, in comparison with control plants, it decreases the yield of inflorescence stems in the first and second year of the plants’ flowering. It is benefi cial to apply benzyladenine at a concentration of 400 mg x dm-3 on the leaves of Liatris spicata L. ‘Alba’ cultivated in an unheated plastic tunnel, because this treatment increases the number and fresh weight of inflorescence stems as well as the number of primary shoots in the first and second year of the plants’ flowering. It is also justifi ed to apply benzyladenine at a concentration of 400 mgdm-3 on Liatris spicata L. ‘Alba’ cultivated in the field, as it leads to a greater number and fresh weight of inflorescence stems in the first and second year of flowering.
The effect of BA, GA3 and BA+GA3 on fl owering of peach-leaved bellfl ower (Campanula persicifolia L.) ‘Alba’, grown in an unheated plastic tunnel or in open fi eld, was investigated. Bioregulators at the following applications: 0, 100, 200, 400 mg x dm-3, were applied foliarly twice. It has been found that the cultivation of peach-leaved bellfl ower in an unheated plastic tunnel accelerates flowering of plants by about 2 – 3 weeks, compared to open field cultivation, in the fi rst and second year of fl owering of plants. It is advisable to apply gibberellic acid at a concentration of 400 mg x dm-3 in plastic tunnel cultivation of bellfl ower and at a concentration of 200 mg x dm-3 in field cultivation, since this treatment accelerates flowering by 2 – 9 days. It is recommended that gibberellic acid should be applied at a concentration of 400 mg x dm-3, which extends the fl owering period of peach-leaved bellfl ower grown in a plastic tunnel by 6 – 13 days. When peach-leaved bellfl ower is grown in an unheated plastic tunnel, full fl owering is predicted to occur in the fi rst or second week from the beginning of fl owering of plants. When bellfl ower is grown in open fi eld, full bloom of infl orescences is expected in the second week of flowering of plants. Irrespective of the type of substance applied in both years of cultivation, in the unheated plastic tunnel the largest amount of inflorescences was ready for cutting in the first decade of June, and in the field in the second decade of June.
Acta Agrobotanica
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2005
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tom 58
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nr 2
163-169
The experiments were carried out in the years 2002 and 2003 on parsley seeds of 6 cultivars: Alba, Berlińska, Cukrowa, Kinga, Lenka, and Vistula. Mycological analysis of parsley seeds showed that the most common inhabitans were fungi from genus Alternaria (mainly A. alternata and A. radicina) and Fusarium, especially F. avenaceum and F. oxysporum. During the glasshouse investigations fungi Alternaria radicina, A. alternata and Fusarium avenaceum were the main reason for parsley damping-off. The highest number of infected seedlings was observed for Berlińska and Kinga, because in both years of experiments these cultivars had the lowest number of healthy seedlings. The highest number of healthy seedlings had cultivars Alba and Lenka, especially in the second year of experiments. In the field experiments not only fungi from genus Alternaria and Fusarium were the most often isolated from diseased parsley seedlings. Fusarium oxysporum was more often isolated from diseased field seedlings than from glasshouse parsley seedlings. Other fungies isolated often from parsley seedlings cultivated in the field were: Pythium spp., Rhizoctonia solani, Cylindrocarpon destructans and Stemphylium botryosum.
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