Abstract:
yield stability using the additive main effect andmultiplicative interaction (AMMI) analysis.Highly significant (𝑃 < 0.001) effects of
genotype, environment, and genotype ∗ environment interactionwere observed for all traits studied.TheAMMIanalysis of variance
indicated that genotype accounted for 51% of the total sum of squares for height at first branching followed by environment (33%)
and interaction (15%). For fresh root yield, environment effects accounted for 37% of the total sum of squares, whilst genotype
and interaction accounted for 32% and 29%, respectively. Genotypic variances for harvest index (HI), plant height, storage root
yield, and dry matter content contributed a greater proportion of the phenotypic variance indicating stronger genetic control.
This suggests better chance of progress in the genetic improvement of these traits. Genotype MM96/1751 combined high yield
with stability according to the yield stability index ranking across environments. On the other hand genotypes UCC 2001/449 and
96/1708 though high yielding were unstable according to AMMI stability value scores. However they can be tested further in more
environments to ascertain their specific adaptability for release to farmers for cultivation to boost cassava production and ensure
food security.
