Evaluation of grain yield stability of advanced rainfed lentil genotypes using parametric and non-parametric statistics and SIIG index

In order to select genotypes with high and stable yield, recent research was conducted as uniform regional trials including 16 selected lentil genotypes in four regions of Gachsaran, Khorramabad, Moghan and Ilam, during two cropping years. Genotypes stability was assessed through using parametric and non-parametric statistics. Stable genotypes based on CVi had lower than average yields. Regarding regression coffecicient and deviation from regression, in total, genotype 10 was determined as the most stable genotype by considering yield. Rick equivalence and chokella variance statistics identified genotypes 12, 1, and 10 as stable genotypes. based on Hanson (Di) statistic, genotypes 12, 13 (low yield average) and 9, 10 (high yield average) were more stable and based on coefficient of determination, G9, G12 and G10 were more stable genotypes. Based on Kang index (YSi), genotypes 9, 10, and 2 were identified as stable genotypes. Regarding the results of nonparametric statistics of Nasar and Hyun (Si 1,2,3,6) and Tanarazo (NPi 1,2,3,4), more stable genotypes had lower yield than average. According to TOP statistic, genotypes 9, 11, and 5 were ranked in the top. The SIIG index also identified genotypes 4, 3, 13 and 10 as the most stable genotypes, of which only genotype 10 had higher than average performance.