Twenty four genotypes were tested for grain yield in four diverse locations over two seasons i.e. 2005-06 and 2006-07. The genetic material contained 19 promising lines and five checks representing the local and improved cultivars for Zoon B (250-350 mm/year) in Syria. The results showed the significant role of the genotype by environment interaction of crossover type in the performance of the genotypes studied and their ranking across test environments. The largest portion of the variance due to GE interaction was attributed to genotype by season GS and Genotype by location by season GLS interactions which revealed the importance of selection for yield stability in addition to average yield across environments.