Alam MN, Abedin MJ, Azad MAK
A field experiment was conducted to determine the effect of micronutrients on growth and yield of onion (Allium cepa L.) cv. Taherpuri in “High Ganges River Floodplain” soils of Bangladesh. There were 11 treatment combinations viz. T1 (control), T2 (Zn), T3 (B), T4 (Zn+B), T5 (Zn+B+Mo), T6 (Zn+B+Mn), T7(Zn+B+Cu), T8 (Zn+B+Cl), T9 (Zn+B+Mo+Mn), T10 (Zn+B+Mo+Mn+Cu) and T11 (Zn+B+Mo+Mn+Cu+Cl), laid out in RCBD with three replications. The six micronutrients Zn, B, Mo, Mn, Cu and Cl were applied at the rate of 3-3-0.5-4-1-20 kg/ha and also N, P, K, and S were applied at 150-50-100-20 kg/ha respectively as basal dose. Results were found to be significant in most of the yield contributing parameters of onion. The number of leaves per plant (14.63), plant height (61.30 cm), diameter of bulb (14.97 mm), fresh weight of leaves (31.42 g), fresh weight of bulb (9.21g), diameter of bulb (4.36 cm) and bulb yield (13.38 t/ha) were maximum in treatment T4, while T6 and T7 showed maximum fresh weight of roots (1513 mg) and splitting of bulb (9.72) respectively. The combination Zn+B increased the maximum bulb yield by 49.66% over control. On the other hand, Zn and B alone increased the bulb yield by 28.64% and 27.74% over control respectively. The results suggested that the response of micronutrients for onion growth and yield in calcareous soils can be expressed by the following orders: (Zn+B)>Zn>B>Mo.
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