NITROGEN, WEED AND IRRIGATION MANAGEMENT FOR MAXIMIZING GROWTH AND YIELD OF BORO RICE (cv. BRRI dhan29)
Date
2017
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
DEPARTMENT OF AGRONOMY
Abstract
Two consecutive field experiments were conducted at the Suapur Union of
Dhamrai Upazila, Dhaka. The experimental field is located at 23
88´N latitude
and 90
0
14´E longitude and AEZ-12, during the period of 2014-2015 and 20152016
to find out nitrogen, weed and irrigation management for maximizing
growth and yield of boro rice (cv.BRRI dhan29). The experiment comprised
three factors; Factor A: Nitrogen management (4 levels), N
: No urea (control),
N
1
: Urea super granules-USG (77 kg N ha
-1
), N
2
0
: Prilled urea at recommended
dose (150 kg N ha
-1
) and N
3
: ½ of the recommended dose (75 kg N ha
); Factor
B: Weed management (4 levels), W
0
: No weeding (control), W
: Two hand
weeding (20 and 40 DAT), W
2
0
1
: Pre emergence herbicide (Butachor) and W
:
Post emergence herbicide (Prityloclor); Factor C: Irrigation management (4
levels), I
1
: Irrigating all time, I
2
: Irrigating 3 days after drying, I
: Irrigating 5
days after drying, I
: Alternate wetting and drying (AWD) method. The
experiments were laid out in split-split-plot designs with three replications. Data
on different growth characters, yield components and yield of BRRI dhan29
were recorded. Statistically significant variation was observed for different
nitrogen, weed and irrigation management and also for their combined effect.
For nitrogen management, on an average of two consecutive years, the highest
grain yield (6.01 t ha
4
-1
) was recorded from N
1
3
, while the lowest (4.35 t ha
) from
N
0
. In weed management, the highest grain yield (5.92 t ha
-1
) was recorded from
W
2
, while the lowest (4.49 t ha
-1
) from W
. In case of irrigation management, the
highest grain yield (5.88 t ha
-1
0
) was found from I
4
-1
, while the lowest (4.70 t ha
)
from I
1
. For the combined effect of different nitrogen and weed management, the
-1
3
-1
highest grain yield (6.80 t ha
-1
) was recorded from N
iii
1
W
, whereas the lowest
(3.85 t ha
-1
) from N
0
W
0
2
. Due to the combined effect of different nitrogen and
irrigation management, the highest grain yield (6.36 t ha
-1
) was recorded from
N
1
I
4
, whereas the lowest (3.80 t ha
-1
) from N
0
I
. In case of combined effect of
different weed and irrigation management based on pooled data, the highest
grain yield (6.52 t ha
-1
) was recorded from W
2
I
4
1
, whereas the lowest (3.85 t ha
)
from W
0
I
. Due to the combined effect of different nitrogen, weed and irrigation
management, on polled basis the highest grain yield (6.99 t ha
1
-1
) was recorded
from N
1
W
2
I
4
, while the lowest yield (3.18 t ha
-1
) from N
0
W
0
I
. The treatments
having significantly high grain yields over others were N
1
1
W
1
I
),
N
1
W
2
I
4
(6.99 t ha
-1
), N
1
W
3
I
4
(6.90 t ha
-1
), N
2
W
2
I
4
(6.70 t ha
-1
),N
2
4
(6.61 t ha
W
),
N
3
W
2
I
4
(6.54 t ha
-1
) and N
3
W
3
I
4
(6.61 t ha
-1
), which were identical among
themselves.
Description
A Thesis
submitted to the Faculty of Agriculture
Sher-e-Bangla Agricultural University, Dhaka
in partial fulfilment of the requirements
for the degree of
DOCTOR OF PHILOSOPHY
IN
AGRONOMY
Keywords
NITROGEN, WEED AND IRRIGATION MANAGEMENT, BORO RICE (cv. BRRI dhan29)