Abstract:
A field experiment was conducted at the Agronomy research field of Sher-eBangla
Agricultural
University,
Dhaka during the period from December 2014
to May 2015 to find out the herbicidal efficacy and residual activity on
transplanted aromatic boro rice (cv. BRRI Dhan50). This was a single factor
experiment which consisted of nine treatments, viz., T
0
: (control), T
:
Acetochlor + Bensulfuron- methyl (changer) [750 g ha
-1
], T
: Pyrazosulfuronethyl
(super
powder)
150
g
ha
-1
. T
3
2
1
, T
4
: Pretilachlor (superhit) 1 L ha
: Bispyribac sodium (extra power) 150 g ha
-1
. T
: Pretilachlor + Triasulfuron (Rifit +
logran) 1 L ha
-1
+ 10 g ha
-1
, T
6
5
: Propyrisulfuran+ Propanil [500 ml ha
+1000 g
ha
-1
], T
7
: Propyrisulfuran + Propanil [380 ml ha
-1
+1500 g ha
-1
], T
: Two hand
weeding at 20 DAT and 40 DAT. The experiment was laid out in Randomized
Complete Block Design (RCBD) with three replications. T
treatment had
killed the highest number of weeds its residual activity remained up to 45 days.
So, the highest weed control efficacy (98.74%) was found from T
7
treatment
and it had checked seven weed species including the dominating weed Behua
(Cyperus difformis) from rice field. On the other hand, the highest weed
infestation and yield loss (44.09%) were recorded in T
(control) treatment. At
the later growth stage, the highest plant height, panicle length, maximum
number of tillers hill
-1
, number of effective tillers hill
0
-1
, minimum non-
effective tillers hill
-1
, primary branch panicle
-1
8
-1
7
, secondary branch panicle
,
filled grains panicle
-1
, minimum unfilled grains panicle
-1
, maximum total grains
panicle
-1
, 1000 grain weight, straw yield (7.11 t ha
-1
), and the highest grain
yield (6.35 t ha
-1
) were obtained from T
(Propyrisulfuran + Propanil [380 ml
ha
-1
+ 1500 g ha
-1
7
]) treatment compared to the T
(control) treatment. It can be
concluded that weed free condition throughout the growth period might be
considered as an important factor for the best performance of transplanted
aromatic boro rice (cv. BRRI dhan50).
0
1
-1
Description:
A Thesis
Submitted to the Department of Agronomy,
Sher-e-Bangla Agricultural University, Dhaka
In partial fulfillment of the requirements
for the degree
of
MASTER OF SCIENCE (MS)
IN
AGRONOMY
SEMESTER: JANUARY - JUNE, 2015
