|Authors: ||P.J. Jansen van Vuuren, A.C. Lubbe|
|Keywords: ||Verbena x hybrida, germination percentage, cardinal temperature|
The influence of temperature on Verbena. x hybrida Voss seed germination was evaluated, in terms of current germination recommendations to overcome erratic and low germination.
During three experiments, non-dormant seeds were exposed to continuous constant temperatures and alternating diurnal temperatures.
Seeds were germinated on germination paper inside clear petri dishes, using dark temperature-controlled incubators.
No germination occurred at constant 10°C. Significantly (P≤0,05) reduced germination occurred at constant 15°C and at irregular fluctuating temperatures, while 25°C was assumed as a cardinal constant temperature.
Controlled fluctuations did not significantly reduce germination.
V. x hybrida seed should be germinated at any alternating diurnal temperature regime with a constant amplitude, between 28°C day and 14°C night temperatures.
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