Abstract:
A research work was carried out at the Agronomy Farm, Sher-e-Bangla Agricultural
University, Dhaka-1207 during the period August to December 2008 to determine the
suitable nitrogen dose and weeding method to cultivate transplanted Aman rice
variety BRRI dhan46 with higher yield harvest. The experiment comprised five doses
of nitrogen viz. N
1
= 50 % lower nitrogen than recommended dose, N
= 25 % lower
nitrogen than recommended dose, N
3
= Recommended dose of nitrogen, N
= 25 %
higher nitrogen than recommended dose, N
= 50 % higher nitrogen than
recommended dose and three weeding methods viz. W
5
1
2
4
= Control (No weeding), W
= Hand weeding at 20, 35 and 50 DAT and W
= Weeding with Japanese rice weeder
at 20, 35 and 50 DAT. The experiment was set up in a split-plot design with three
replications. Experimental Results indicated that nitrogen doses had the significant
effect on plant height, tillers hill
-1
3
, weight of dry matter hill
-1
, weed dry matter weight
m
-2
, effective tillers hill
-1
, panicle length, filled grains panicle
-1
, grain yield, straw
yield and harvest index. Nitrogen dose 25 % higher than recommended dose (N
)
showed the highest grain yield (5.34 t ha
-1
) that mainly attributed by the highest
effective tillers hill
-1
and highest filled grains panicle
-1
. Among the weeding methods
hand weeding treatment gave the highest grain yield (4.73 t ha
-1
) and it was mainly
attributed by the highest effective tillers hill
-1
, filled grains panicle
-1
and 1000- seed
weight. Combination of nitrogen doses and weed management methods did not
significantly influenced the yield of rice.
4
2
Description:
A Thesis
Submitted to the faculty of Agriculture
Sher-e-Bangla Agricultural University, Dhaka,
In partial fulfillment of the requirements for the degree of
MASTER OF SCIENCE
IN
AGRONOMY
SEMESTER: JANUARY-JUNE, 2010
