Abstract:
A field experiment was conducted at the experimental field of Agronomy Department of
Sher-e-Bangla Agricultural University, Dhaka during the period from August 2008 to
January 2009, to study the influence of nitrogen levels and seedling types on growth and
yield of T. aman rice (cv. BRRI dhan46). The experiment comprised five levels of nitrogen:
50% lower nitrogen than recommended dose (N
), 25% lower nitrogen than recommended
dose (N
2
), recommended dose of nitrogen (N
3
1
), 25 % higher nitrogen than recommended
dose (N
4
) and 50 % higher nitrogen than recommended dose (N
) and three types of seedling:
seedling grown in wet seedbed (S
1
5
), seedling grown in floating seedbed (S
) and seedling
grown in dapog seedbed (S
) in Split-Plot design. Twenty five percent higher nitrogen than
recommended dose of nitrogen (N
3
4
) showed highest grain yield (4.93t ha
-1
), for highest dry
matter hill
-1
(17.83 g, 33.50 g and 45.16g, respectively at 60 DAT, 90 DAT and harvest),
effective tillers hill
-1
(10.38), filled grains panicle
-1
(88.55) and harvest index (47.27%).
Seedling grown in wet seedbed (S
1
) showed highest grain yield (4.73 t ha
), with highest
tillers hill
-1
(5.57, 10.10, 13.04 and 14.24, respectively for 20, 40, 60 and 80 DAT), effective
tillers hill
-1
(10.16), panicle length (24.21 cm), filled grains panicle
-1
(89.50), and harvest
index (45.93%). The highest grain yield (5.60 t ha
-1
) was obtained from 25% higher nitrogen
than recommended dose of nitrogen along with seedlings of wet seedbed and at par with the
yield (5.40 t ha
-1
) from recommended dose of nitrogen with seedling from wet seedbed.
2
-1
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
MASTER OF SCIENCE
IN
AGRONOMY
SEMESTER: JANUARY - JUNE, 2010
