Abstract:
A pot experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka
during the period from July to December 2020 to ameliorate the salt stress in aromatic
rice by application of different organic manures. The two factor experiment was
conducted by following RCBD design with four replications. Factor A consisted three
NaCl levels viz; S
0
= 0 ppm pot
-1
(Control), S
1
ii
= 1200 ppm pot
-1
and S
2
= 2400 ppm
pot
-1
and Factor B consisted five types of organic manures viz M
0
= No organic
manure (Control), M
1
= Biochar 4 t ha
-1
, M
2
= Vermicompost 6 t ha
-1
, M
3
= Azolla 0.5
t ha
-1
and M
4
= Cowdung 10 t ha
-1
. Result revealed that salinity decreased plant
height, leaf
number, tiller number, LAI, SPAD value, RWC, grain yield and other
yield attributes. Exposer of 1200 ppm and 2400 ppm NaCl decreased grain yield by 7
and 16% in Binadhan-13 compared to control by decreasing effective tillers.
Application of different organic manures such as Biochar, Vermicompost, Azolla and
Cowdung significantly influences growth and yield of aromatic rice. Vermicompost
application (6 t ha
-1
) recorded the highest number of effective tillers hill
(10.40),
filled grains panicle
-1
(98.83), grain yield (25.25 g pot
-1
-1
), straw yield (94.09 g pot
),
biological yield (119.35 g pot
-1
) and harvest index (21.12 %). Different types of
organic manures application under NaCl stress condition recovered growth and yield
loss of aromatic rice. Among the organic manures Vermicompst gave highest grain
yield in all stresses
viz S
0
M
2
(28.15 g pot
-1
), S
1
M
2
(24.45 g pot
-1
) and S
2
(23.15 g
pot
-1
) comparable to
others treatment combinations. So, it might be concluded that,
the growth and yield of rice decreased with the increasing dose of salt and application
of different organic manures recovered growth and yield of rice by ameliorating salt
stress. However, application of Vermicompost might be the best approach to reduce
salt-induced damages in 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
