Abstract:
The present study was conducted at the Horticulture farm of Shcr-c-Bangla
Agricultural University, Shcr-c-Bangla Nagar, Dhaka, during the period
from 01 May 2005 to 30 April 2006. The experiment was conducted to
investigate the effect of bulb sizes i. e. srnal 1, medium and large ( 1.5-:?..0 ,
2.1-2.5 and 2.6-3.0 cm in diameter respectively) and growth regulators i.e.
Gibbcrellin (GA3) and Ethylene ( ethrel) on the growth and flowering of
tuberose cv. Single. Bulb size had significant effect on plant height, height
or the side shoot, number of leaves/plant (mother bulb), number of
leaves/plant (side shoot), number of side shoots per plant, days to spike
emergence, days to first flowering, duration of flowering. Bulb size had
also significant effect on yield contributing characteristics. Large bulb was
found to be superior to medium and small bulb. GA3 and ethrel
signi licantly improved the plant characteristics relating to the growth and
flowering of tuberose cv. Single. In general, influence of GA3 was more
pronounced than ethrel in respect of all parameters except duration of
flowering. Significant interaction was observed between bulb size and
growth regulators treatments in respect of different parameters studied
except number of side shoot/plant, duration of flowering and number of
florets in 100 gm. The best results were obtained in the large bulb size
when combined with GA3 followed by ethrel
