ABSTRACT
The performance of intraspecific and interspecific hybrids across environments was investigated for two years (1983, 1984) at three locations that vary widely in temperature: Matamoros, Coahuila, Ciudad Obregon, Sonora, Mexico; and at Las Cruces, New Mexico. For yield, highly significant differences (P=0.01) were found among hybrids, hybrids by locations and hybrids by location by year. Despite the many interactions the average performance of the interspecific and intraspecific hybrids was the same. The nonsignificant hybrids by years interaction and the highly. Significant hybrids by locations interaction indicate is on multiple location testing. Across locations and years, the highest lint yield was obtained by the check cultivar 'Deltapine Acala 90'. (1682 kg/ha). However, the highest yield in Las Cruces across years was obtained by 15-lE' X 'Line G' ('NX-1'), and in Matamoros the highest yield was obtained by 'Deltapine SL' X 'Line G'. Hybrid yields at Ciudad Obregon, Sonora were very poor. The group of hybrids under study were therefore not so widely adapted as the check. For pollen fertility, the hybrid by location interaction was highly significant and larger than the genetic variance. This may be the reason why hybrids did so badly at the Ciudad Obregon (hottest location) environment.
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