Abstract:
The biological efficacy of different herbicides (Sencor 7 WGJ SOOg ha
1
. Lintur
70
WG
250g
hi'. Ronstar @ Iliter ha
4
) applied at different stages of crop growth as
compared to untreated areas was studied for controlling weeds in wheat in a field
experiments at the
research
farm of Sher-e-Bangla Agricultural University during
2007-
08.
Herbicides were applied at
7 DAS, 14
DAS and 21 DAS. A weedy check (no
herbicide) was also included for comparison. The analysis of the data revealed significant
differences among the times of application for biological yield and grain yield. Similarly
significant differences were recorded for herbicidal treatments in traits like 1000 grains
weight (g), biological yield (t ha
1
) and grain yield (t ha
4
). The interaction of the times of
application and herbicides was significant
for
grain yield. Maximum 1000 grains weight
(47.48g)
was observed in plots treated with Ronstar, while minimum
check plots (no herbicide). Biological yield
(38.17g)
in weedy
(7.0
t hi') and grain yield
(3.16
t ha
1) were
higher in plots treated with Ronstar while lower biological yield
(4.5
t hi') and grain
yield (1.62 t ha4
) were in weedy check plots. Ronstar proved to be the most economical
and effective herbicides which gives maximum grain yield of
yield
(7.3
t hi'), when applied at 21 DAS in wheat.
