Influence of botanical seed pelleting on storability of onion (Allium cepa L.)

Onion (Allium cepa L.) is a major bulbous vegetable as well as condiment of family Alliaceae grown in India, originated in Iran and Pakistan. Seed pelleting is a mechanism of applying various materials to the seed that can enhance the seed quality with respect to physiological, physical and health attributes. Seed deterioration during storage is inevitable process; however seed pelleting can reduce the rate of deterioration. The leaf powders possess antioxidant, fungicidal and insecticidal properties that helps in maintaining the seed quality during storage.

The present investigation was carried out in the laboratory of Department of Seed Science and Technology, Dr. Y.S. Parmar University of Horticulture and Forestry, Nauni, Solan (HP) during the seasons of 2016–17 and 2017–18. This experiment comprised of pelleted seeds with different botanicals carried out to determine the effect of seed pelleting and storage potential of pelleted seeds.

This experiment comprised of pelleted seeds with different botanicals. In all the treatments gum Arabica (5%) was used as the adhesive except control. The pelleted seeds with different material were stored at ambient conditions for nine months. Highest germination (81.75%), seedling length (11.20 cm), seedling dry weight (1.82 g), seedling vigour index- length (920.33), seedling vigour index- mass (148.90) and speed of germination (26.57) were observed in onion seeds pelleted with Azadirechta indica leaf powder + clay and Melia azadirechta leaf powder + clay. Among the storage periods, fresh pelleted seed (0 month) showed maximum values with respect to germination (86.50%), seedling length (13.38 cm), seedling dry weight (2.02 g), seedling vigour index- length (1154.50), seedling vigour index- mass (173.52) and speed of germination (29.04). From the present studies, it can be concluded that onion seeds pelleted with Azadirechta indica leaf powder + clay and Melia azadirechta leaf powder + clay showed significant effects for enhancing seed quality during storage.