Abstract
The aim of the research was to estimate the suitability of 15 new tulip cultivars for winter forcing. In the presented research 13 cultivars of the tulip Triumph Group, ‘Andre Rieu’ from the Single Late Group and ‘Princess Household’ from the Fosteriana Group were evaluated. The tulips were cooled for 14 and 16 weeks in standard conditions, at the temperature of +9°C and then placed in a glasshouse for forcing at the end of January and in the second 10-days’ period of February. Tulip bulbs cooled for 16 weeks and then forced since the second 10-days’ period of February acquainted the marketable value more quickly and formed flowers of much better quality in comparison to those cooled for 14 weeks and forced since the end of January. On the basis of the observations, the following cultivars might be recommended for winter forcing: ‘Copex’, ‘Editie.NL’, ‘George W. Bush’, ‘Lemon Ice’, ‘Piet Veerman’ and ‘Princess Household’, as they are characterized by quick growth, attractive appearance and long vase life. The following cultivars proved less suitable for forcing: ‘Laura Bush’, ‘Prins Willem Alexander’, ‘Purk’, ‘Red Rover’, ‘Topkapi’, ‘Vittorio’ and ‘Jan Siemiernik’. They are characterized by poor growth and unattractive appearance. The flowers of those cultivars were small and poorly coloured, with an undefined shape and short life. The cultivar ‘Andre Rieu’ from the Single Late Group is characterized by a long forcing period and poor growth. Besides, it formed small and faintly coloured flowers while their stems were short, delicate and with few leaves. Because of poor quality and a low decorative value of flowers, this cultivar is not recommended for winter forcing.
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