Abstract:
The field experiment was conducted at the Horticulture farm of Sher-e-Bangla
Agricultural University, Dhaka from March to June, 2021 to find the effect of methyl
jasmonate and chitosan on the growth, yield and quality in onion (BARI Piaz-5). The
experiment was conducted with two factors; Factor A: Methyl Jasmonate (four levels)
i.e., M
0
(Control), M
1
(25 µM), M
2
vi
(50 µM) and M
3
(75 µM) and Factor B: Chitosan
(four levels) i.e., C
0
(Control), C
1
(2 µM), C
2
(4 µM) and C
3
(6 µM) followed by
Randomized Complete Block Design with three replications. Plant growth, bulb
development and their quality attributes significantly improved by the application of
methyl jasmonate and 50 µM of methyl jasmonate performed the best for diameter of
bulb (3.18 cm), single bulb weight (15.72 g), yield (10.48 t/ha) and β–carotene (12.02
mg/100g) whereas 75 µM of methyl jasmonate is best for length of bulb (4.01 cm)
and Vitamin-C (17.24 mg/100g) comparatively than other treatments. Chitosan also
increases the vegetative growth, yield and nutritional profile with the application of 4
µM of chitosan performed best for length of bulb (3.98 cm), single bulb weight (16.25
cm), yield (10.83 t/ha), TSS% (9.19) and Vitamin-C (14.83 mg/100g) comparatively
than other treatments. For combined effect, 25 µM of methyl jasmonate with 4 µM of
chitosan produced the highest length of the bulb (4.35 cm), diameter of the bulb (3.49
cm) and single bulb weight (18.33 g) comparatively than other treatment
combinations. Whereas, the amount of β–carotene (14.23 mg/100g) in bulbs enhanced
substantially at 25 µM of methyl jasmonate with 6 µM of chitosan application and the
amount of Vitamin-C (19.60 mg/100g) increased significantly at 75 µM of methyl
jasmonate with 4 µM of chitosan application. Results presume that the highest bulb
yield (12.22 t/ha) was obtained by the application of 25 µM methyl jasmonate with 4
µM of chitosan which would be the best option to maintain better growth, yield and
quality for cultivating onion in summer season.
Description:
A Thesis
Submitted to Department of Entomology,
Faculty of Agriculture.
Sher-e-Bangla Agricultural University,
Dhaka-
In partial fulfillment of the requirements for the degree of
MASTERS OF SCIENCE (MS)
IN
DEPARTMENT OF HORTICULTURE
