| Summary: | Seven true seed shallot lines were evaluated for 3 years at 3 locations to
determine their performance and stability. Stability differences were
assessed on the basis of linear regression of the lines on environmental
index and on deviation from linear function along with the mean yield. The
combined analysis showed that bulb yield over 9 environments ranged from 15.1
to 17.5 t ha-1 with overall mean yield of 16.5 t ha-1, and lines Vethalam,
Tropix, Dz-94 and Athlas gave the highest mean yield. The combined analysis
of variance showed significant (p<0.05) genotype and genotype by environment
effects on bulb yield. The regression coefficient for bulb yield ranged from
0.72 to 1.36. The regression coefficient of two high yielding lines (Vethalam
and Athlas) was above 1, and was higher in environments where growing
conditions were favorable. High and significant deviations were obtained for
lines Tropix and Athlas and these lines were found unstable to change in
environment. However, line Tropix showed specific adaptation to low yielding
environments of Kulumsa and Melkassa. The best line Vethalam with a small
deviation from regression was found widely adaptable to different
environments and it was released with local name ‛Yeras’ to be grown in Rift
Valley and similar areas in Ethiopia.
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