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An experiment entitled “Efficacy of plant growth regulator (GA3) on growth and yield attributes of cauliflower (Brassica oleracea var. botrytis L.) at Dehradun Valley” was conducted at Horticulture Research Block, Shri Guru Ram Rai University, Dehradun, Uttarakhand during winter season from November 2018 - February 2019. The experiment was laid out in Randomized Block Design (RBD) with three replications. Ten different concentrations of GA3 viz. (20, 40, 60, 80, 100, 120, 140, 160,180 and 200 ppm) were used over control. Among all the treatments it was concluded that for growth attributes GA3 @ 60 ppm gave maximum plant height (49.57 cm), minimum number of days taken to 50% marketable curd size (94.53 days) and also increases yield attributing characters such as curd diameter (17.9 cm), Gross yield (3.53g/plant), Net yield (1040g), yield per plot (12.28 kg) and yield per hectare (365.63 q). From this experiment, it was concluded that 60 ppm of GA3 can be recommended in cauliflower for higher yield.

Efficacy of plant growth regulator (GA3) on growth and yield attributes of cauliflower (Brassica oleracea var. botrytis L.) at Dehradun valley