A study was conducted in castor to estimate the magnitude of heterosis for yield and its eleven yield components. 32 F1 hybrids generated line × tester mating design developed by Kempthorne (1957). These F1S along with 12 parents were evaluated in a randomized block design with three replications at Agricultural Research Station at sansoli, Anand, Gujarat (India). | Heterosis for seed yield and its contributing attributes in castor Ricinus communis L.