In Nioro, the grain yield varied from 87 kg [ha.sup.-1] for inbred line IBL 110-B-1 to 2966 kg [ha.sup.-1] for the hybrid IBL 206-1-1 x Sosat C 88.
The hybrids IBL 091-1-1 x Sosat C 88 and IBL 206-1-1 x Souna 3 performed well under both locations and were among the best ten genotypes across the two environments.
The tester Sosat C 88 and the inbred line IBL 003-B-1 had significant positive GCA effects while the tester Souna 3 showed significant negative GCA effects for TGW.
The top-cross hybrid IBL 1552-1 x Sosat C 88 was the only one which exhibited negative and significant SCA effects for DMI.
IBL 206-1-1 x Souna 3, followed by IBL 001-4-1 x Souna 3, had the largest best parent heterosis for grain yield and was among the best five hybrids while IBL 119-B-1 x Sosat C 88 had the least best parent heterosis value.
However, despite the site effect on grain yield and yield related traits, some of the genotypes such as IBL 0911-1, IBL 091-1-1 x Sosat C 88, and Thialack II have performed well under the two environments.
Grain yield showed a mid-parent heterosis ranging from -16% to 125% and most of the hybrids except IBL 106-B-1 x Sosat C 88 and IBL 179-2-1 x Souna 3 exceeded the parental lines.