Asian Journal of Research in Botany

The experiment was conducted in the Horticultural Farm of Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh.The experiment consisted of two factors. Factor A: Different levels of potassium as K₀= Control, K₁= 100 kg K/ha, K₂= 120 kg K/ha, K₃= 140 kg K/ha and Factor B: E₀= no earthing up, E₁= two times earthing up, E₂= three times earthing up. The experiment was laid out in a Randomized Complete Block Design with three replications. The collected data were statistically analyzed. Results revealed that in terms of potassium application, the highest gross yield of roots/ha (38.35 t) and marketable yield of roots/ha (35.32 t) were recorded from the application of K₂ (120 kg K/ha) treatment compared to K₀ (control) treatment. Again, in terms of different earthing up treatments, the highest gross yield of roots/ha (35.71 t) and marketable yield of roots/ha (34.75 t) were found from the treatment E₂ (three times earthing up) compared to E₀ (no earthing up) treatment. Both potassium and earthing up and their combination showed significant variation on different parameters of carrot. The highest gross yield of roots/ha (43.51 t) and marketable yield of roots/ha (42.29 t) were found from the treatment combination of K₂E₂ (120 kg K/ha + three times earthing up) compared to K₀E₀ (control) treatment combination. The highest gross return (Tk. 8,45,800), net return (Tk. 6,52,102) and BCR (4.37) were obtained from the treatment combination K₂E₂ (120 kg K/ha + three times earthing up) where the lowest gross return (Tk. 4,00,600), net return (Tk. 2,43,718) and BCR (2.55) were obtained from K₀E₀ (control) treatment combination. So, It can be concluded that 120 kg K/ha with three times earthing up was the best for carrot growth, yield and economic benefit.