Abstract:
The experiment was carried out at the Postharvest Laboratory of the Department
of Horticulture, Sher-e-Bangla Agricultural University in Dhaka to observe the
effects of irradiation and 1-MCP on shelf life and postharvest quality of onion
bulbs during the period from March 2022 to June 2022. The onion variety used
in this experiment was Indian Mori kata piaz. The experiment comprised four
levels of gamma irradiation viz., I
0
= 0.00Gy, I
1
= 10Gy, I
2
= 60Gy, I
3
= 120Gy
and four levels of 1-methylcyclopropene (1-MCP) viz., M
0
= 0.00 ppm, M
1
=
150 ppm, M
2
= 300 ppm, M
3
= 450 ppm were used in this experiment. The
experiment was laid out in a completely randomized design (CRD) with three
replications. Data revealed that Physiological weight loss and the rotting
percentage were higher in the untreated (control) bulbs. In gamma radiation
treatment, the minimum weight loss (17.01%), rooting percentage (7.9%) at 90
DAS. Maximum shelf life (110.83 days) of onion was found in I
3
treatment. In
different 1-MCP treatment, the minimum weight loss (17.88%), minimum
rotting percentage (12.61%), minimum total soluble solid (15.75 ºBrix) at 90
DAS. Maximum shelf life (103 days) of onion was found in M
3
treatment. The
gamma irradiation treatment at 120 Gy in combination with 450 ppm 1-MCP
preserved the quality of the onion bulbs for approximately 120 days under
ambient condition. From the results, it may be concluded that treatment I
3
(120 Gy+ 450 ppm 1-MCP) could be used to prolong shelf life, reduce rotting
percentage and quality retention of onion.
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
