Author(s):

GB Vekaria, ML Patel, DS Hirpara, MM Talpada, KS Jotangiya and TJ Patel

Abstract: A Field experiment was conducted at Main Dry Farming Research Station, Junagadh Agricultural University, Targhadia (Rajkot) under North Saurashtra Agro climatic Zone of Gujarat. during kharif season of the year 2012-13 to 2015-16 with the view to study the “Effect of plant growth regulators and detopping on yield of Bt cotton (Gossypium hirsutum L.) under rainfed condition. Nine treatment combinations were tried in randomized block design with three replications. The result revealed that the significantly maximum number of flowers/plants were recorded under treatment of (T₈) (30.9) at 75 DAS, (T₈) (29.7) at 85 DAS and (T₈) (6.9) at 110 DAS, respectively i.e. Detopping at 75 DAS and spraying of Ethrel @ 50 ppm at 90 DAS. The maximum number of bolls per plant at 75 DAS was recorded (11.2) with T3 (Detopping at 75 DAS). Whereas, maximum number of bolls per plant at 27.2 at 85 DAS and 28.3 at 110 DAS with T8 (Detopping at 75 DAS + Ethrel @ 50 ppm at 90 DAS), respectively. The effect of growth regulators and detopping on yield, It was indicated that the maximum seed cotton yield (2859 kg ha^-1) was obtained in treatments of detopping at 75 DAS + spraying of ethrel @ 50 ppm at 90 DAS (T₈) and it was statistically at par with T₆ (Detop.at 60 DAS+Ethrel 50 ppm at 75 DAS). Similarly, maximum biological yield (7238 kg ha^-1) also recorded with T8 and which was statistically at par with T₄ and T₅.

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