study of adaptability and stability of sugar beet monogerm cultivars in different locations of iran

stability analysis and g*e interaction of eight commercial monogerm cultivars of sugar beet were evaluated in three years at 11 major sugar beet producing locations karaj mashhad miandoab esfahan shiraz kermanshah kerman moghan hamedan khoy and brojerd. a randomized complete block design with four replications was used.in each location cultivars  rasoul shirin univers orbis 7112hybrid 436hybrid and 428hybrid were recorded. data collected from each experiment were subjected to simple analysis of variance and after homgenization of error variance combined analysis for six traits including ry sy sc wsy na and yield were carried out. the stability parameters such as environmental variance environmental coefficient of variation linear regression coefficient mean square deviation from regression and linear coefficient of determination for each cultivar were determined. the results of the combined analysis showed significant effect of cultivars years(y) locations (l) year*location (y*l) and genotype*year (g*y). comparison of means usingduncansnew multiple range test showed that cultivars univers orbis and 276hybrid were superior in many locations compared to other cultivars. results from stability analysis indicated that univers and hybrid 276 were the most stable cultivars tested in different environments ofiran.