Efffect of plant growth regulators on yield and yield contributing character of Bt cotton (Gossypium hirsutum L) hybrid

Abstract

Plant growth regulators are used for cotton (Gossypium hirsutum L.) canopy manipulation to avoid excess growth and yield losses Application of Mepiquat chloride@15ml and 10ml/10 lit of water at square and flowering stage was found significantly superior through out all growth stages which is resulted in alteration of cotton plant growth and development like reduction in plant height, internode length, reduction in leaf area and monopodial branches. It also responsible for increase in sympodial branches, relative water content, chlorophyll content, yield and yield parameters in Bt cotton hybrid. Application of mepiquat chloride (mc) at square and flower formation stage was found effective in reducing plant height, internode length, sympodia, increase in RWC, chlorophyll content and yield attributes as well as GMR, NMR and B:C ratio of Bt cotton.