Stability analysis in turmeric (Curcuma spp.) genotypes

Twenty three turmeric genotypes were evaluated for three consecutive years for plant height, girth of rhizome, length of rhizome, length of primary fingers, drymatter recovery and fresh rhizome yield. The joint regression analysis revealed no significant difference among various genotypes indicating the uniformity of the genotypes. However the G × E (linear) interaction was significant for four out of six traits studied revealing the profound influence of environment on phenotypes. Based on individual parameter's of stability (x_i b_i and S² d_i), genotypes GL-Puram and Thoubal Local (a local genotype of Manipur) were found stable in performance over the years. Other genotypes, viz. Duggirala No. 325, Armoor, PCT - 11 and Chayapasupu were found to have significantly higher regression coefficients along with mean values above general mean for dry matter recovery and fresh rhizome yield depicting the scope for improved performance under favourable farming conditions.