Abstract
The effects of genotype x environment interactions for grain yield on hybrid maize varieties in two locations within the derived and Southern Guinea Savanna environments of Nigeria were investigated. GGE biplot analysis was used to identify suitable varieties for each environment. Significantly higher grain yields were recorded at Ballah (Southern Guinea Savanna) with an average value of 2.06 t/ha compared with 1.8 t/ha obtained from Ilora (derived Savanna). Number of days to 50% silking was also longer at Ballah with a mean value of 61.95. Higher values were however recorded for plant and ear heights at Ilora. Using GGE biplot analysis differences among genotypes was responsible for the greater percentage of the total variation due to genotype, location and genotype x location interaction. The most suitable hybrid varieties for Ballah environment were varieties 8535-23 and 9111-1 while varieties 8522-2 and Oba super 1 were better adapted to Ilora environment.
