Abstract:
The experiment was conducted at the Agronomy Research field of Sher-eBangla
Agricultural University. Dhaka, Bangladesh during March to May,
2007
to study the effect of nitrogen and weeding regimes on yield attributes
and
yield of backgram. The experiment consisted of four levels of nitrogen IN
0
:
0 kg N ha
1; N7
0
: 20 kg N ha'' (as basal); N
40
: 40 N kg ha" (20 kg as basal and
20 kg at 25 DAS) and N
60: 60 kg N ha
-1
(20 kg as basal and 40 kg at 25 and 45
DAS)I and three weeding regimes (W
0
: No weeding (control); W
1 : One
weeding at 25 DAS and W
2
: Two weeding at 25 and 45 DAS.
respectively).The blackgram variety BARlnlash3 was used as study material
for the experiment. The experiment
was
laid out in a randomized complete
block design (RCBD). Both nitrogen and weeding showed significant variation
at 25 to 45 DAS on plant height, number of leaiiet plant
1
, leaf dry weight, stem
dry weight. reproductive dry weight. aboveground dry weight, number of pods
plant", 1000 seeds weight. seed yield kg ha" and harvest index (%).
Among
the four levels of nitrogen, significantly highest values of all the parameters
were recorded from N
40
while the lowest ones from N
o
. The highest seed yield
and harvest index were recorded as 1618.21 kg ha
-1
and 33.80%. respectively
which were obtained from N40
, while the lowest values of the said parameter
were found (1306.33 kg ha" and 31.28%) from N
o
. Among the three weeding
regimes. W2
performed the best on all the parameters studied, incontrust W
o
was the worst. The highest seed yield (1748 kg ha") and harvest index (33.76
%) were obtained from W
2
while the lowest ones 1288 kg ha" and 31.07%
from W0
. Interaction effect of nitrogen and weeding regimes had significant
effect for the parameters except branches plani" seed pod"' 1000 seeds weight,
harvest index (%) and leaves dry weight. The highest seed yield (1917.31 kg
ha") was recorded from N
40W2
and the lowest (1046.86 kg ha") was recorded
from N0W0
. The highest harvest index (36.18%) was also recorded from N
40W2
and the lowest (30.36%) from N
0W0.
