A field experiment was conducted to evaluate the efficacy of micronutrients on the performances of onion (Allium cepa L. var. Arka Kalyan) with respect to its total dry matter yield during 2014-15 at College of Horticulture (OUAT), Sambalpur, Odisha under All India Network Research Project on Onion and Garlic, India. The experiment was laid out in RBD having four replication with following treatments: T₁ (soil application of Zinc Sulphate @ 10.0 kg ha^-1)_, T₂ (foliar application of Zinc Sulphate @ 0.5 % at 30 & 45 days after planting), T₃ (soil application of Borax @ 10.0 kg ha^-1), T₄ (foliar application of Borax @ 0.25% at 30 & 45 DAP), T₅ (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 i.e. without micronutrients). The recommended dose of fertilizer (RDF) used for onion crop was 150:50:80:30 NPK kg ha^-1 along with FYM @ 20 t ha^-1, applied uniformly in all the treatments. The results revealed that foliar application of micronutrient mixture significantly increase the number of leaves plant^-1 (12.62), total bulb yield (268.28 qha^-1), dry matter yield of leaves (1.18 tha^-1), bulb (4.74 tha^-1), total dry matter yield (5.91 tha^-1), highest gross income (2.68 lakhs/ha) as well as net income (1.95 lakhs/ha) than rest of the treatments. The second-best treatment was found to be foliar application of borax @ 0.25 % at 30 and 45 DAP (T₄) in all parameters. Similar trend was also observed for Benefit Cost Ratio (BCR), significantly highest being calculated in T₅ (2.65) closely followed by T₄ (2.26) which was statistically at par with each other.