Abstract

FRANCESCANGELI, N.  and  ZAGABRIA, A.. Bulb cold storage and use of paclobutrazol for pot tulip production. Agriscientia [online]. 2007, vol.24, n.1, pp.37-44. ISSN 1668-298X.

The effect of bulb cold storage time (ST) and paclobutrazol (PBZ) on commercial characteristics of pot tulips Tulipa gesneriana L. (Leen van der Mark) was tested. PBZ concentrations (0 and 5 ppm) applied by dipping bulbs for 24 hours before transplanting and 5 °C ST (5, 6, 7, 8, 9, 10, 11, and 12 weeks) were evaluated. Mean air temperature throughout the experiment remained between 15 and 15.7 °C. PBZ did not affect the duration of the cycle. ST explained 83% of the variation in the duration of the period transplant-sale time, and the relationship was inverse. PBZ did not affect flower size. There was a significant interaction between treatments for plant height at sale time and at the end of flowering: plant height increased with ST in all cases, but the increase was lower in the PBZ treated plants. Without PBZ and with bulbs stored at 5 °C for 5 to 8 weeks, it was possible to produce commercial plants which were shorter or as tall as plants obtained from bulbs stored at 5 °C for 12 weeks and dipped for 24 hours in a 5 ppm PBZ solution.

Keywords : Tulipa gesneriana L.; Plant growth regulator; Height; Bulb cold storage time.

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