Effect of different doses of herbicide (Pendistar 33 EC) for controlling weed in onion field

Abstract A experiment was conducted at Agronomy field of Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur and Regional Agricultural Research Station, Jessore during rabi season of 2017-18 to find out the optimum dose of herbicide and to know the weed control efficiency. The treatments were T 1 =Pendistar 33 EC @ 1.0 L/ha spraying at 3–4 DAT, T 2 =Pendistar 33 EC @ 1.5 L/ha spraying at 3–4 DAT, T 3 = Pendistar 33 EC @ 2.0 L/ha spraying at 3–4 DAT, T 4 =Pendistar 33 EC @ 2. 5 L/ha spraying at 3–4 DAT, T 5 = Pendistar 33 EC @ 3.0 L/ha spraying at 3–4 DAT, T 6 = Weed free (two hand weeding), T 7 = No Weeding (Control). Among the different doses of herbicide Pendistar 33 EC @ 2.0 L/ha spraying at 3–4 DAT, showed the best results in controlling different types of weedst. Plant height, single bulb weight and bulb yield of onion were significantly influenced by different doses of Panida 33EC herbicide. The highest single bulb weight (85.96 and 85.73 g) and bulb yield (5.33 and 6.06 t/ha) was obtained from T 6 at Gazipur and Jessore which was statistically similar with T 3 where single bulb weight (85.73 g ) and yield (5.13 t/ha) was obtained at Gazipur and single bulb weight (83.01 g) and yield (5.63 t/ha) at Jessore. The highest gross margin (Tk.49500 /ha at Gazipur and Tk.59400/ha at Jessore) was noticed in T 3 due to lower cost involvement as compared to T 6 . Higher BCR was calculated in T 3 (1.93 at Gazipur and 2.12 at Jessore. Treatment T 6 failed to produce higher gross margin and BCR due to higher cost involvement in T 6 for more number of weeding. The result revealed that two hand weeding would be the best option for getting maximum yield of Onion. Among herbicidal weed control, spraying of Pendistar 33 EC @ 2.0 L/ha spraying at 3–4 DAT might be economically profitable for controlling weeds in onion field.