The effects of Gamma radiation doses at different times after harvesting on onion (Allium cepa L.) cultivars storability

• Main Authors: Khodadadi, Mohsen, Zolfaghariyeh, Hamid Reza, Niamanesh, Heydar, Sobhani, Mosoud, Kahbazi, Majid, Tahami, Seyyed Mohammad Reza, Babaee, Mohammad
• Format: Publication
• Language: Persian
• Published: Karaj (Iran) Seed and Plant Improvement Institute - SPII 2007
• Subjects: CEBOLLA; COSECHA; GAMMA RADIATION; HARVESTING; http://www.fao.org/aos/agrovoc#c_12934; http://www.fao.org/aos/agrovoc#c_3186; http://www.fao.org/aos/agrovoc#c_3500; OIGNON; ONIONS; RADIACION GAMMA; RAYONNEMENT GAMMA; RECOLTE

Onion is an important vegetable that a considerable amount of it 's product especially in long day cultivars losses in storage process.The losses prevention and reducing methods are related to production stages and post harvest conditions. One of the effective methods after harvesting is radiation of bulbs by ionized rays as Gamma ray.This research was conducted for 2 years in Seed and Plant Improvement Institute for surveying of different Ionized radiation doses on four cultivars composed Ghermeze Azar Shahr, Sefide Kashan, Dorcheh Isfahan and Sefide Qom. The research was done in split plot design with three replications that cultivar and radiation doses were main and sub factors respectively. Bulbs after radiation stored for four months in ambient condition (10-15 centigrade degree and 60-70% RH) and storage traits composed sprouting and rotting percentage, weightal loss percentage, dry matter perentage and tissue firmness (kg/cm2) recorded in 40 , 80 and 120 days intervals. For economic analysis of the experiment, partial budgeting method and the economic profitability of the treatments by replacement of them was used. In order to determine the best treatment for 120 days storage, the investment analysis and marginal investment return rate were done.The results showed that cultivars had significant different in all traits. Sefid Qom and Ghermeze Azar Shahr cultivars had the least sprouting percentage and weightal loss percentage in all periods. Dry matter percentage and tissue firmness in Sefid Qom was higher than other cultivars. The radiation doses in comparison to nonradiation caused significant improvement in traits specially 120 days after storage. The reciprocal effects of experimental factors did not significant different in traits exceptly in sprouting and rotting percentage after 80 days storing and weightal loss after 120 days storing.The economic survey results showed that the best treatment was a4b6 . So cultivar of Sefide Qom that was radiated by 0.15 gray of Gamma radiation, had best storability than other cultivars with another doses.