National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692 Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
A field experiment was conducted at Department of Horticulture, Agricultural College & Research Institute, Killikulam, Thoothukudi district of Tamil Nadu during Rabi 2018 to study the influence of various growth hormones on bulb size and yield increase and to standardize the appropriate hormone and concentration for increasing the yield and yield attributing traits in onion cv. Agrifound Light Red. The experiment consisted of 9 treatments in various concentrations of four growth retardants, viz. Chlormequat, Mepiquat chloride, Brassinolide and Daminozide. The results revealed that among different growth retardants, Mepiquat chloride 500 ppm significantly reduced the plant height (55.10 cm), increased the number of leaves per plant (10.10) at 90 days after sowing, neck diameter (2.25 cm), root length (8.15 cm) and total chlorophyll content of leaves (2.49 mg/g). The day taken for maturity was recorded minimum in Mepiquat chloride 500 ppm(127.30) while maximum was recorded in control (135.66). Mepiquat chloride 500 ppm application also significantly improved the yield attributing characters viz.,bulb diameter(5.86 cm), bulb height(5.28 cm), bulb weight(76.00 g), marketable yield of bulb/ha(512.15 q) and reduced unmarketable yield of bulb/ha(36.195 q)thereby exerting superiority over other treatments and control for total yield of bulb/ha(548.35 q).
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