Abstract:
The experiment was conducted at the Farm of Sher-e-Bangla Agricultural University,
Sher-e-Bangla Nagar, Ohaka, Bangladesh during the period from October 2009 to
March 2010 to study the growth and yield of composite and hybrid maize as aflècted
by time of irrigation. The experiment comprised as two factors. Factor A: Maize
variety - 2 levels: V
1
: BARI bhutta-7 and V
2
: BARE hybrid bhutta-5. Factor B: Time
of irrigation - 8 levels, I: No irrigation: I: One irrigation at 35 DAS; 12: One
irrigation at tasseling; 1
3
: One irrigation at silking; 1
4
: Two irrigations at 35 DAS and
tasseling; I
c
: Two irrigations at 35 DAS and silking;
L:
Two irrigations at tasseling
and silking and 1
7
: Three irrigations at 35 DAS, tasseling and silking. The experiment
was laid out in split-plot design with three replications. Data on different growth
parameter, yield attributes and yield were recorded and analyzed. At 40, 60, 80 DAS
and at harvest the tallest plant (23.54 cm, 57.98 cm, 106.88 cm and 170.68 cm,
respectively) was recorded from V
2
. while the shortest plant (21.46 cm, 55.58 cm,
99.93 cm and 161.56 cm, respectively) from V
1
. The highest grain yield (7.48 tJha)
was found from V
2
. while the lowest (3.96 t/ha) from V
1 . At 40, 60, 80 DAS and at
harvest, the tallest plant
(25.09
cm, 61.46 cm, 111.51 cm and 175.45 cm, respectively)
was observed from 1
7
, again the shortest ([8.64 cm, 50.46 cm, 90.56 cm and 147.07
cm, respectively) from The highest grain yield (6.31 tiha) was obtained from b and
the lowest (4.06 tJha) from 10. At 40, 60, 80 DAS and at harvest, the tallest plant
(26.53 cm. 63.04 cm. 118.70 cm and 187.10 cm. respectively) was observed from
V217
, again the shortest (14.77 cm, 48.27 cm, 78.19cm and 132.31 cm, respectively)
from V
110
. The highest cob length (19.63 cm) was found from V
217, while the lowest
(11.40 cm) from V
1!0
. The highest cob diameter (3.74 cm) was observed from V
2!7.
again the lowest (2.38 cm) from V
1 10
. The highest 1000 grain weight (423.93 g) was
given by V
213
. while the lowest (235.23 g) was found in V
110. The highest grain yield
(8.48 tTha) was recorded from V
2!7 that similar to V
2!6 (8.04 tiha) and the lowest
(2.55
tlha) from V
1
1
0.