Standardization of protocol for seed pelleting in onion (Allium cepa) to improve seed handling

Abstract

A pelleting method for onion (Allium cepa L.) seed has been standardized using locally available cheaper materials, viz. vermicompost, cow dung and clay powders as stuffing materials, and methyl cellulose and polyvinyl alcohol as adhesive materials. The pelleted onion seeds resulted from this method were bold, smooth, round and uniform in size that helped in easy handling. The pellet weight was increased almost 4-5 times of nonpelleted seeds. The quality of pelleted seed was on par with nonpelleted seed in terms of germination and seedling vigour. The germination and seedling vigour index were 87% and 1117, respectively in pelleted seeds and 89% and 1169 in nonpelleted seed. The bulb yield of pelleted seed treatment (31.81tonnes/ha) was better than nonpelleted seed (27.85 tonnes/ha). The pelleted seeds could be stored for 3-4 months even under ambient conditions without decline in viability and vigour.