Researchers studied the gene action and heterosis in field bean crosses to improve productivity. They used a 7x7 half diallel scheme to create 21 F1 and F2 crosses. Significant genetic effects were found for seed yield and its traits in both generations. Some crosses showed strong heterotic effects for seed yield. Additive gene effects were predominant, with certain genotypes being good combiners for seed yield. Positive and significant specific combining ability effects were observed in over 25% of crosses. Dominance effects were larger than additive effects for all traits. Low narrow-sense heritability indicated the presence of non-additive genetic effects in both generations.