Hybrids and purelines, as genotypic classes, showed significantly different responses to environmental variation in the SRPN in 1994 and 1995 and SVT in 1993 and 1994.
Mean yield of hybrid wheats significantly exceeded the pureline mean yield in 1991 through 1995 SRPN, ranging from a 0.
1990 1991 1992 1993 SRPN SRPN SRPN SRPN Hybrids Mean, Mg [ha.
For SRPN and SVT trials in which a significant difference was observed between in hybrid and pureline regression responses, hybrid regression slopes ranged from b = 1.
Average hybrid and pureline regression responses for each year of the SRPN and SVT are illustrated in Fig.
Environments in the SRPN and SVT trials were not distributed uniformly throughout the observed range of environmental index.
In the SRPN trials, the 95% CI for hybrid and pureline yield responses overlapped throughout the observed range of environmental indices, although in the 1994 SRPN, divergence was indicated at intermediate index values, ranging from [approximately equals] 2.