Abstract:
A pot experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka
during the period of September to November- 2020 to ameliorate the salt stress in
soybean by application microbial biofertilizer. The two factor experiment was
conducted by following CRD design with four replications. Factor A consisted of
three levels of NaCl viz; S
0
= 0 ppm NaCl pot
-1
(Control), S
1
= 1800 ppm NaCl pot
and S
2
= 3600 ppm NaCl pot
-1
and Factor B consisted of four levels of biofertilizer
viz; B
0
= 0 g Rhizobium @ 50 kg seed, B
1
= BARI RGm-907 @ 25 g/50 kg seed, B
=
BARI RGm-922 @ 50 g/50 kg seed and B
= BARI RGm-928 @ 75 g/50 kg seed.
Result revealed that salinity decreases plant height, leaf number, SPAD value, RWC,
pod plant
-1
3
, seed yield and other yield attributes. Exposure of 1800 ppm and 3600
ppm NaCl decreased seed yield by 48.34% and 56.83% in soybean compared to
control by decreasing pod number. Application of different biofertilizers significantly
influences growth and yield of soybean. BARI RGm-922 (50 g/50 kg seed)
application recorded the highest number of pods plant
-1
, seeds pod
(3.11), 1000
seeds weight (88.61 g), seed yield (6.54 g pot
-1
-1
), stover yield (19.75 g pot
),
biological yield (35.56 g pot
-1
) and harvest index (24.69 %). Different types of
biofertilizer application under salt stress condition recovered growth and yield loss of
soybean. Among the biofertilizers BARI RGm-922 (50 g/50 kg seed) gave highest
seed yield in all stresses viz S
0
B
2
(9.77 g pot
-1
), S
1
B
2
(5.14 g pot
-1
) and S
(4.70 g
pot
-1
) comparable to others treatment combinations. So, it might be concluded that,
the growth and yield of soybean decreased with the increasing dose of salt and
application of different biofertilizers recovered growth and yield of soybean by
ameliorating salt stress. However, application of BARI RGm-922 (@ 50 g/50 kg
seed) as biofertiizer might be the best approach to reduce the salt induced damages in
soybean.
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
