The goal of the majority of plant breeding is the increase the yield ability and quality of different crops. To achieve this goal , breeders usually develop breeding programs to select better lines or to produse superior f1 hybrids. The investigation of the relative magnitude of general combining ability brovides the evidence to which approach should be followed.The presence of large and significant estimates of general combining ability would indicate that select and develop superior varieties from the segregation generations of f1 hybrids.
The results in this investigation presented on evidence about the precence of large amounts of heterosis from the med –parent .However, specific hybrids were for greter and exceeded high –parent. Therefore , selection programs in the segregation generations of this superior hybrids would yield a high performing lines making use of the large amounts of additive grnertic variance present in the population . In this case, the choice of parets for hybridization is of almost importance.