Abstract:
The experiment was conducted at the research field of Sher-e-Bangla Agricultural
University, Dhaka during the period from November 2017 to May, 2018 to know the
effect of foliar application of salicylic acid on mitigation of drought stress of BRRI
dhan28. the experiment consist of two factors with different levels of treatments viz
A: T
0
= 0.0 µMm
−2
SA, T
1 =
250 µMm
−2
SA, T
2 =
500 µMm
−2
SA, T
3 =
SA, T
4 =
1000 µMm
−2
SA. B: different level of drought stress, S
0
=
control (normal
irrigation), S
1
= moderate drought stress (water withheld from flowering stage to
season end), S
2
=
Sever drought stress (water withheld from panicle initiation stage to
season end). The experiment was laid out in Randomized Complete Block Design
(RCBD) with three replications. Significant variation was recorded for data on
growth, yield and yield contributing parameters. The maximum values for plant
height, number of leaves hill
-1
, number of tillers hill
-1
, dry weight hill
, leaf area
index, relative water content (%), leaf membrane stability index, flag leaf chlorophyll
content (µMm
−2
), thousand seed weight, number of filled grains panicle
, 1000 grain
weight (g), grain yield, and straw yield, biological yield, harvest index were obtained
from foliar application of SA @ 750 µMm
−2
). Significant influence was remarked in
terms of all parameter with different level of drought stress of BRRI dhan28. Results
showed that the highest plant height, number of leaves hill
-1
750 µMm
-1
-1
, number of tillers hill
,
root dry weight plant
-1
, dry weight plant
-1
, leaf area index, relative water content, leaf
membrane stability index, flag leaf chlorophyll content, number of filled grains
panicle
-1
was also obtained from normal irrigation without drought stress. The
maximum grain yield was obtained from normal irrigation. The treatment normal
irrigation
produced the highest straw yield, biological yield and harvest index.
Interaction effect of salicylic acid and different level of drought stress was
significantly influenced for all parameter measured. The maximum grain yield (12.02
g hill
-1
) was with foliar application of SA @ 750µMm
−2
with normal irrigation. BRRI
dhan 28 planted with drought stress at panicle initiation stage (severe drought stress)
would be mitigated by the application of SA @ 750µMm
−2
.
−2
-1
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
MASTERS OF SCIENCE
IN
AGRICULTURAL BOTANY
SEMESTER: JANUARY-JUNE, 2018