بررسي پايداري عملكرد ارقام جو زراعي با استفاده از معيارهاي ناپارامتري

Study of yield stability in barley (Hordeum vulgare L.) cultivars through non-parametric measures

In order to study of advanced barley lines, 19 genotypes of barley (Hordeum vulgare L.) with one control were evaluated in 3 years (1998-2000) at 10 locations. These trials were carried out in the form of a randomized complete block design with 4 replications. In order to introduce stable line (s), several non-parametric measures including mean of rank, standard deviation of rank, yield ratio index and the 4 methods proposed by Tennarasue were used. Analysis of variance for each environment (year and location combination) and combined analysis of variance for year combinations and three years were accounted. The results of analysis of variance for each enviroment showed a significant difference between genotypes in some environments. The main effects of genotype and environment and genotype x environment interaction were significant, indicating yield fluctuation and difference among yield cultivars in various environments. Overall, genotypes 5 and 17 were distinguished as stable and genotype 13 and 7 as unstable. Non-parametric methods of mean and standard deviation of rank are preferred, because they were easy for calculation and conformity with yield of stable cultivars.