Abstract:
An investigation was conducted during November 2007 to March 2008 at
Horticultural Farm, Sher-e-Bangla Agricultural University, Dhaka to evaluate the
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effect of spacing and planting time on growth and yield of onion. Three levels of
spacing, S1 = 20cm x l Ocm, S2 = 20 x 20cm, S3 = 20cm x 30cm and four different
planting time, PT1 = 7 November 2007, PT2 = 22 November 2007, PT3 = 7 December
2007, and PT4 = 22 December 2007 were used as treatment in the study. The
experiment was layout in RCBD with three replications. Significant variation was
found due to different spacing and planting time on growth and yield contributing
characters of onion. In case of spacing, the highest plant height (60.44 cm), number of
leaves (7.09), bulb weight (34.4 g) and bulb diameter (5.03) was recorded from 83
while S
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treatment gave the minimum. In planting time, the highest plant height
(62.41 cm), number of leaves (6.22), bulb weight (42.21 g) and bulb diameter (5.35)
was observed from PT1 and the lowest from PT4• For combined effect S1PT1 produced
the highest yield ( 13 t/ha) and the lowest from S3PT 4. The highest benefit cost ratio
(3.10) was noted from S1PT1 and lowest (l.01) from S3PT4. Considering the above
finding, 7 November sowing with 20cm xIOcm spacing was found best for growth
and bulb yield of onion .
