Response of foliar application of ga3 in different plant ages for seed production in black cumin

Abstract

Abstract : The effect of foliar application of plant growth regulator viz. GA3 in different growth stages was investigated on growth and yield of black cumin at Horticulture Research Field, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh in Rabi season of 2012. The experiment consisted of 7 levels of GA3 (0, 25, 50, 75, 100, 125 and 150 ppm) with three replications. Different doses of GA3 were sprayed both at vegetative (40 days) and flowering stage (60 days). The results indicated that, growth and yield of black cumin were increased due to enhanced application of GA3 up to 100 ppm. Application of GA3 at vegetative stage was more effective than that of flowering stage. The maximum number of branches/plant, plant height, weight/plant, capsule/plant, 1000 seed weight, seed yield and stover yield were observed with application of GA3 lOOppm at vegetative stage. The highest yield (2. 09 t/ha) was obtained by the application of GA3 at vegetative stage. The results suggest that for higher seed production of black cumin, GA3 should be applied at vegetative stage with concentration of 100 ppm.