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The experiment was conducted at Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola to study the effect of boron application on seed yield and growth of onion on Inceptisol in randomized block design with seven treatments and three replications fertilized with different levels of boron during Rabi season of 2014-15 to 2016-17. The treatments consisted of different levels of boron in onion through soil and foliar applications viz., T1 – Control, T2 soil application of borax @ 1.5 kg ha -1 , T3 soil application of borax @ 3.0 kg ha -1 , T4 soil application of borax @ 5.0 kg ha -1 , T5 foliar application of borax @ 0.1% at buttoning stage, T6 foliar application of borax @ 0.2% at buttoning stage, T7 foliar application of borax @ 0.3% at buttoning stage. Significantly the highest seed yield (12.32 q ha -1 ) was recorded with foliar application of borax @ 0.2% at buttoning stage (60 DAP) (T6) followed by foliar application of borax @ 0.3% at buttoning stage (12.00 q ha -1 ) (T7) which was statistically at par with soil application of borax @ 3.0 kg ha -1 (11.19 q ha -1 ) (T3). In the present investigation, significantly the maximum total number of umbels (12.49) and test weight (5.09 gm) of seed were found with the foliar application of borax @ 0.2 % at buttoning stage (60 DAP) which was at par with foliar application of borax @ 0.3 % followed by soil application of borax @ 3.0 kg ha -1 as yield contributing characters. The highest B:C ratio was recorded with foliar application of borax @ 0.2% (3.54) followed by foliar application of borax @ 0.3% (3.42) and soil application of borax @ 5.0 kg ha -1 (3.18). Thus, it could be inferred that, the foliar application of borax @ 0.2% at buttoning stage recorded highest seed yield, number of umbels and umbellate with higher B:C ratio. K e y w o r d s

Seed Yield and Growth of Onion as Influenced by Soil and Foliar Application of Boron