Effect of different concentrations of GA₃ and NAA and their methods of application on growth and yield of onion (Allium cepa L.)

The experiment was conducted in rabi season during the year 2000–2001 at Horticultural Research Farm at IGKV, Raipur (CG). There were 18 different plant growth regulators treatments comprising of two PGR (GA and NAA) each in three doses (20, 40, and 60 ppm of GA₃ and 200,300 and 400 ppm of NAA) and applied through three different application methods (seed soaking, root dipping and foliar spray). Results indicates that growth characters viz., plant height, leaf length and culm width were influenced by different doses and application methods of PGRs. Root dipping with GA₃ 40 or 60 ppm was found superior than other treatments for above characters. Number of leaves, culm length, bulb length and bulb diameter were not influenced by different treatments. Root dipping with GA₃ at 20 ppm produced highest bulb weight (43.90 g). Marketable yield and total yield of onion bulb were significantly higher in root dipping with GA₃ at 40 ppm followed by root dipping with GA₃ at 60 and at 20 ppm treatments.