Yield stability analysis of gum guar genotypes in North Eastern Karnataka

Stability analysis studies for seed yield of ten gum guar genotypes was carried out at five locations during Kharif / Rainy season, 2013-14 using randomized block design. Regression of the mean yield of the individual genotypes on the environmental index and deviations of the regression co-efficient from the unity was used to calculate stability of the trait for each genotype. Pooled analysis of variance for seed yield displayed significant differences among environments, genotypes and environments × genotype interactions advocating the adequacy of stability analysis. Genotype GAUG-13 recorded highest (718.33 Kg/Ha) average mean yield followed by RGC-986(647.40 Kg/Ha), RGC-936-1-5 (646.70 Kg/Ha), HG-884 (635.00 Kg/Ha), HGS-563 (623.83 Kg/Ha) and HG-365 (619.07 Kg/Ha) across locations. Based on stability parameters, genotypes RG-936-1-5-1 (646.70 Kg/Ha) and HG-884 (635.00 Kg/Ha) recorded mean yield above the overall mean along with regression value nearer to unity (bi= 1.07) and (bi= 1.06) and non-significant deviation from regression (S2di = -2277.91) and (S2di = - 4651.56), respectively, indicating the high stability and wider adaptability across the environments