Impact of plant growth regulators on the growth and yield of cotton

Abstract

The experiment was carried out in a three replicated randomized complete block design, having net plot size of 6 x 8 m = (48 m²), during the year 2013-14 at the experimental fields of Cotton Section, Agriculture Research Institute, Tandojam. The treatments are comprised such as control or un-treated plots, Planofix at 50 ml/500 litres of water at bud formation, Planofix at 100 ml/500 litres of water at bud formation, Planofix at 150 ml/500 litres of water at bud formation, Pix at 500 ml/500 litres of water at bud formation, Pix at 1000 ml/500 litres of water at bud formation, Pix at 1500 ml/500 litres of water at bud formation.Theobersation were recorded on parameters of economic importance such as plant height (cm) Monopodial branches per plant, Sympodial branches per plant, Opened bolls per plant, Un-opened bolls per plant, Seed cotton weight per plant (g), Seed cotton yield (kg ha^-1), Ginning out-turn G.O.T. (%). All the growth and yield character of cotton variety of sindh-1 was significantly at (P<0.05) affected by various plant growth regulators. The maximum plant height (137 cm), monopodial branches per plant (1.9), symonopodial branches per plant (23.0), opened bolls per plant (30.1), un-opened bolls per plant (4.0), seed cotton yield per plant (97.4 g), seed cotton yield (3074.0kgha^-1) and G.O.T (34.5%) were observed underPix at 1000 ml/500 litres of water at bud formation. It is concluded from studies that all the characters of cotton variety sindh-1 was significant at 5% probability level except G.O.T % which was non-significant Plant growth hormones are effective for enhancing the yield of cotton crop.Pix at 1500 ml/500 litres of water at bud formationis more effective for obtaining more number of bolls per plant and maximum seed cotton yield per plotsas well as seed cotton yield kg ha^-1.