Effect of Micronutrient Application on Vegetative Growth and Bulb Yield Attributes of Rabi Onion (Allium cepa L.)

An experiment was conducted to evaluate the efficacy of micronutrients on performance of Onion cv. Sukhsagar at Nadia, West Bengal during 2017-2018.The experiment was laid out in RBD having four replication with six treatments each having FYM @ 20 t ha-1, viz. T1 (RDF + soil application of Zinc Sulphate @ 10.0 kg ha-1), T2 (RDF+ foliar application of Zinc Sulphate @ 0.5% at 30 & 45 days after planting (DAP), T3 (RDF+ soil application of Borax @ 10.0 kg ha-1), T4 (RDF+ foliar application of Borax @ 0.25% at 30 & 45 DAP), T5 (RDF+ Foliar application of Micronutrient Mixture i.e. iron-2.5%, boron-0.5%,zinc -3%, copper -1%and manganese-1% @ 0.5% at 30 & 45 DAP) and T6 (control). Highest plant height (63.72 cm), number of leaves/plant (12.71), polar diameter (58.62 mm), equatorial diameter (46.88 mm), average weight (61.72 g) of bulb, yield ha-1 (266.80 q) and highest % (29.82) of A grade bulbs, were recorded with T₅ followed by T4.Hence, it is concluded foliar application of micronutrient mixture @ 0.25% followed by borax @ 0.5% at 30 and 45 DAP is better in respect of bulb growth and yield.