In this study, 56 F 1 crosses of B. napus, including their eight parents, were developed through complete diallel mating design. Analysis of variances (ANOVA) of combining ability showed very highly sig-+nificant (P B 0.01) values for the general combining (GCA), specific combining (SCA) and the reciprocal combining ability (RCA) towards yield and its associated traits. Parental lines, AUP-9 (3.51), AUP-18 (37.26), AUP-20 (0.12), AUP-7 (0.11), and AUP-18 (5.66), were found as
the best general combiners for each of the traits: pods on main raceme, pods on individual plant, seeds on each pod, 1000 seed weight and seed yield plant -1 , respectively, whereas, based on desirable SCA effects, crosses found
best were AUP-14 9 AUP-18, AUP-14 9 AUP-20, AUP-8 9 AUP-20, AUP-2 9 AUP-18, AUP-2 9 AUP-14, and AUP-2 9 AUP-9 for pods main raceme -1 , pods plant -1 ,seeds pod -1 , 1000 seed weight and seed yield plant -1 ,respectively. Superior reciprocal hybrids for economically important traits such as pods main raceme -1 , pods plant -1 , seeds pod -1 , and seed yield plant -1 were AUP-17 9 AUP-9, AUP-14 9 AUP-2, AUP-18 9 AUP-7 and AUP-20 9 AUP-8, respectively, involving at least one best general combiner (parental line). Estimates of combining ability variances and predictability ratio (r 2 GCA/r 2 SCA\1.00) revealed the preponderance of a non-additive geneaction and was further confirmed by higher values of variances due to SCA than GCA.