Abstract:
A pot experiment was conducted at the net house of Agro-Environmental
Chemistry Laboratory, Department of Agricultural Chemistry, Sher-e-Bangla
Agricultural University, Dhaka-1207 from November, 2020 to April, 2021 to
observe the effects of salinity on growth, yield, and nutrient content of two onion
cultivars. The experiment was conducted using two varieties (BARI Piaz-1 and
BARI Piaz-6) and five salinity levels (0, 3, 6, 9 and 12 dSm
-1
). The experiment was
set in Completely Randomized Design (CRD) having two factors with three
replications. Results of the experiment showed that plant height, number of leaves
per plant, length of leaf, fresh weight of leaf per plant, length of bulb, diameter of
bulb, individual bulb weight of onion were influenced by varieties. The tallest plant
(40.90 cm) was found in BARI Piaz-1 that statistically not significant. BARI Piaz-6
achieved the maximum length of leaf (34.65 cm), number of leaves per plant
(5.39), fresh weight of leaf per plant (1.73 g), length of bulb (30.33 mm). Among
the two cultivars, the higher individual bulb weight (30.56 g) was found in BARI
Piaz-6. Among different salinity levels the maximum plant height (43.99 cm),
length of leaf (37.29 cm), fresh weight of leaf per plant (2.07 g), length of bulb
(30.33 mm), diameter of bulb (31.5 cm) of onion was obtained at 0 dSm
. The
highest individual bulb weight (34.26 g) was also recorded at control treatment.
Among the combined effects of varieties and salinity levels, individual bulb weight
(36.70 g) was found in BARI Piaz-6 with 0 dSm
-1
level and at 3, 6, 9 and 12 dSm
salinity levels BARI Piaz-6 should better result than BARI Piaz-1. Among the two
varieties, K content was maximum in BARI Piaz-6 than BARI Piaz-1. In both
varieties K content decreased significantly with the increasing salinity level. Na
content was higher in BARI Piaz-1 than BARI Piaz-6. In both varieties it increased
significantly with the increasing salinity level. N content was higher in BARI Piaz6
than
BARI
Piaz-1.
P
and
S
content
was
higher
in
BARI
Piaz-1
than
BARI
Piaz-6.
The
cultivar
BARI Piaz-6 had better expression of morphological, yield and yield
contributing characters than those of BARI Piaz-1 under salinity stress.
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
MASTER OF SCIENCE
IN
AGRICULTURAL CHEMISTRY
SEMESTER: JAN-JUNE, 2021
