Abstract:
In the present study the effect of both Gibberellic Acid (GA
) and plant spacing on growth
and yield of lettuce was examined at Horticulture Farm, Sher-e-Bangla Agricultural
University, Dhaka during the period from October 2013 to January 2014. During cultivation,
three levels of Gibberellic Acid (GA
3
), (G
0
= 0 mg/L, G
1
3
=25 mg/L and G
=50 mg/L) and four
levels of plant spacing’s as S
1
= 15x20 cm, S
2
=20x25 cm, S
3
=25x25 cm, S
2
=25x30 cm were
evaluated in Randomized Complete Block Design with three replications. In case of different
factors the maximum gross fresh yield (29.05 t/ha) was recorded from G
, whereas the
minimum gross fresh yield (16.27 t/ha) was recorded from G
0
4
1
. The spacing of S
recorded
the maximum gross fresh yield (23.8 t/ha) due to highest fresh weight of plants, while the
minimum gross fresh yield (14.82 t/ha) was obtained from the widest spacing’s S
due to
lowest number of plants at 45 DAS. In case of combined effect the highest gross fresh yield
(27.73 t/ha) was obtained from G
1
S
where as the lowest gross fresh yield (16.27 t/ha) was
recorded from G
0
S
4
3
. Cost benefit analysis indicate that the highest benefit ratio (2.04) was
obtained from G
1
S
3
, where as the lowest benefit ratio (1.16) was obtained from G
. On the
basis of overall effect and economic analysis it can be concluded that GA
concentration (25
mg/L) and plant spacing (25x25 cm) on growth and yield proved to be the most promising
3
for getting optimum yield in lettuce and it is apparent that it was suitable for lettuce
0
3
S
4
1
