Front Line Demonstration on Multiplier Onion (Allium cepa L. var aggregatum Don) to Reduce Cost of Production.

Front line demonstration on seed propagated Multiplier onion cultivar (cv) CO(On) 5 was carried out in Vadavathur village of Namakkal District of Tamil Nadu during Oct 2014-March 2015 to study the cost of production of Co (On) 5. The treatments comprised of propagation of small sized onion through seed, seed treatment with bio control agents (Trichoderma viride and Pseudomonas fluorescence), nursery management for CO (On) 5, soil test based fertilizer application, foliar spray of micronutrients, and integrated pest management practices for thrips. The plant height at 45 DAP (38.5cm), number of leaf sheath per plant (23), compound bulb weight per plant (14.3–27 g) and bulb yield (20.5t/ha) were highest in CO (On) 5 compared to CO4 and Valayapatti local.