Abstract:
A pot experiment was conducted with two rice varieties viz. BRRI dhan28 and BRRI dhan47 in
the experimental shed of Department of Agronomy, Sher-e-Bangla Agricultural University,
Dhaka during boro season (2017-2018) to determine the effect of different level of salinity on
rice and finding out the comparative performance of two varieties under salinity. Mixture of
fresh water and marine water was used as salinity treatments. Four salinity treatments were used
in this experiment viz. control S
0
(only fresh water), Quarter strength marine water S
1
(Three part
fresh water and one part marine water), Half strength marine water S
2
(half fresh water and half
marine water), Full strength marine water S
3
(only marine water). These mixtures were used for
irrigation purpose throughout the life cycle. Salt stress significantly reduced plant height, number
of tillers hill
-1
, leaf relative water content, number of effective tillers hill
, panicle length,
number of filled grains panicle
-1
, 1000 grain weight, grain yield , straw yield and biological yield
but increased the number of non-effective tiller hill
-1
and unfilled grain panicle
. Leaf relative
water content (RWC) also decreased due to salinity. With rise in salinity level adverse effect of
salinity was more clearly visible. Different growth stages showed different sensitivity to salinity.
In fact, the primitive growth stages, that is, tillering and panicle initiation showed more
sensitivity to salinity than final growth stages (panicle emergence and ripening). Therefore,
irrigation with saline water at the early growth stages has more negative effect on yield and its
components. Between the two varieties used in this experiment BRRI dhan47 performed better
than BRRI dhan28 under salinity stress condition.
-1
-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 (MS)
IN
AGRONOMY
SEMESTER: JANUARY-JUNE, 2018
