A study was conducted in ricebean [Vigna umbellata (Thunb.) Ohwi and Ohashi] at Department of Organic Agriculture, CSKHPKV, Palampur to assess the extent of heterosis for eleven characters including grain yield per plant. Six lines and two testers were crossed in line × tester mating design to develop 12 F1 hybrids. The analysis of variance revealed considerable genetic differences among the genotypes. The variance due to parents was significant for all the traits except pods per cluster whereas variance due to crosses was significant all the traits under study. The variance due to parents vs hybrids was also highly significant for all the traits. Among the parents, RBHP-108 (11.95 g), RBHP-43(11.94g), RBHP-36(11.33g), RBHP-107(11.22g) and RBHP-38(11.00g) were the highest yielders whereas among the hybrids, RBHP-36 x RBHP-900(14.78g), RBHP-61x2007-2(14.42g) and RBHP-43x2007-2(12.67g) recorded highest grain yield per plant. Two crosses RBHP-36x2007-2(96 days) and RBHP-38x2007-2(96.33) were significantly early among all the crosses. Results indicated an appreciable amount of heterosis for all the traits under study and varied from character to character. Days to flowering, days to maturity and plant height showed significant negative heterotic effect over mid parent and better parent in 6 crosses viz., RBHP-36 × PRR-2007-2, RBHP-38 × PRR-2007-2, RBHP-38 × RBHP-900, RBHP-43 × RBHP-900, RBHP-61 × RBHP-900 and RBHP-108 x RBHP-900. Significant positive heterosis for grain yield was observed for 2 crosses viz; RBHP-36 × RBHP-900 and RBHP-61 x PRR-2007-2.

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