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Onion (Allium cepa L.), a member of Alliaceae family, is one of the most important commercial vegetable crops grown in almost all parts of the world and believed to be originated from Central Asia and Mediterranean region and commercially grown in China, India, U.S.A., erstwhile U.S.S.R., Japan, Spain, Turkey, Brazil, Egypt, etc. In the world, Onion crop is grown in about 5.30 million hectare area with an annual production of 88.48 million tons with productivity 16.70 tons per hectare. China stands first in the onion production (22.61 million tons from an area 1.03 million hectares area) in...