Half diallel analysis of eight parents was carried out to identify the high heterotic crosses and their relationship in terms of general and specific combining ability (GCA & SCA) in Brassica juncea L. Czern and Coss at IARI, New Delhi, during 2007-2008 and 2008-2009. The relative heterosis and heterobeltiosis were observed to be the highest with respect to seed yield per 100 siliquae and days from sowing to 50% flowering in case of cross IC-199715 × IC-199714, EC-289602 × Prakash in the number of primary branches per plant and harvest index, Agra Local × Pusa Bahar in the length of main axis, Poorbijaya × Agra Local in the number of siliquae on main axis and EC-289602 × Pusa Bahar in the biologic yield per plant and seed yield per plant. Different cross combinations exhibited the maximum value of better and mid-parent heterosis for the remaining traits, viz., days to maturity, number of secondary branches per plant, plant height and 1000-seed weight. GCA and SCA variances were significant in all characters. The variance of GCA (s2g) was observed to be higher from sowing to 50% flowering and maturity in plant height and 1000-seed weight, whereas the variance of SCA (s2s) was higher in seed yield and other remaining parameters.
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