A 6 × 6 parent full diallel set of bread wheat (Triticum aestivum L) was studied for better parent and standard variety. The magnitude of heterosis from F1s was calculated for days to heading, days to maturity, tillers per plant, plant height, spike length, spikelets per spike, grain yield and 1000 grain weight. This study showed that the manifestation of heterosis in F1 hybrids over better parents and standard variety were present for grain yield and yield components. In general positive heterosis was observed for grain yield for both the best parent and standard variety. The increase in grain yield in F1 hybrids seemed to be due to high manifestation of hybrid vigour in the yield components. The maximum heterosis for better parent and standard variety for yield per plant were 194.10% and 193.97% respectively.

Keywords: Bread Wheat, Plant Height, Grain Yield, Better Parent, Standard Variety