Abstract:
The experiment was conducted during the period of June to November, 2018 in the
experimental field of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar,
Dhaka for improving aromatic quality of BRRI dhan80 through minimization of
nitrogen and supplementation of zinc. The experiment consisted of two factors: Factor
A: Levels of N (4) as - N
1
: 35 kg N ha
-1
; N
2
: 37 kg N ha
ii
-1
; N
3
: 39 kg N ha
: 41 kg
N ha
-1
and Factor B: Levels of Zn (4) as -Zn
1
: 4.0 kg Zn ha
-1
; Zn
2
-1
; N
4
: 4.5 kg Zn ha
:
5.0 kg Zn ha
-1
; Zn
4
: 5.5 kg Zn ha
-1
. The experiment was laid out in split-plot design
with three replications. The levels of N were assigned to main plot and levels of zinc to
sub-plot. Result revealed that plant height, effective tillers, filled grains, weight of
1000-grains, grain yield, milled rice, protein content increased with increasing nitrogen
level but amylose, proline and grain 2-Acetyl-1-pyrroline (2-AP) content decreased
with increasing its levels. Zn had no significant effect on 1000 grain weight, grain
yield and size of grain whereas, protein, Zn, proline and grain 2-AP content increased
with increasing its levels. Among the 16 treatment combinations, the highest grain yield
(4.23 t ha
-1
) was observed from N
3
Zn
4
treatment combination which was statistically
similar with N
2
Zn
1,
N
2
Zn
4,
N
3
Zn
3,
N
4
Zn
2,
and N
4
Zn
3.
Significantly the highest protein
content (8.58%-8.95%) was recorded from N
4
Zn
4,
N
4
Zn
3
and
N
2
Zn
3
and the maximum
Zn content (0.159 mg g
-1
DW) was obtained from N
3
Zn
4
which was statistically similar
with N
4
Zn
3
, N
3
Zn
3
and N
2
Zn
4
respectively while the maximum amylose (25.59%),
proline (22.17 mg g
-1
DW) and 2-AP content (0.87µg g
-1
DW) was obtained from N
1
combination. From the present study it may be concluded that the rice growers may use
35- 37 kg N ha
-1
and 4-5.5 kg Zn ha
-1
along with other recommended fertilizers for producing
good quality aromatic rice.
Description:
A Thesis
Submitted to the Department of Agronomy, Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka in partial
fulfillment of the requirement for the degree of
MASTER OF SCIENCE (MS)
IN
AGRONOMY
