TY  - BK
AU  - Worku,M.
AU  - Abera,W.
AU  - Friesen,D.K.|Palmer,A.F.E.
AU  - Girma Taye Awake
AU  - Guta,A.
AU  - Tolessa,B.
AU  - Tuna,H.
AU  - Wolde,L.
AU  - Zelleke,H.
ED  - Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT) Kenya
ED  - 7. Proceedings of the Eastern and Southern Africa Regional Maize Conference
TI  - Yield stability of maize (Zea mays L.) genotypes across locations
SN  - 970-648-120-6
U1  - 338.16 
PY  - 2002///
CY  - Nairobi (Kenya)
PB  - KARI*CIMMYT
KW  - Crop yield
KW  - AGROVOC
KW  - Crossbreeding
KW  - Environmental conditions
KW  - Germplasm
KW  - Maize
KW  - Genetic resources
KW  - Zea mays
KW  - Hybrids
KW  - Plant breeding
KW  - CIMMYT
KW  - KARI
N2  - Maize genotypes vary in their response to variable environmental conditions. Twenty genotypes were tested at nine locations in Ethiopia ( 1,100-2,240 masl) in the 1998 cropping season to study their phenotypic yield stability .Analysis of variance and stability analysis were computed. Variances due to genotypes, environments, and G x E interaction were significant. Linear and non-linear components of G x E interactions were also present. Most genotypes had significant deviation mean square (S2di) implying that they were unstable. None of the top yielding genotypes exhibited general adaptability. Some genotypes had relatively good performance in mid and high altitude areas whereas some had good performance in mid and low altitude areas indicating the possibility to develop specific genotypes adapted to mid and high or low and mid altitude areas. However, the top yielding genotypes were specifically adapted indicating that for high yield potential in each mega-environment, a specific breeding programmme is necessary. Results also showed that understanding of the biophysical limitations within the mega-environment will pave the way for genetic improvement for these limitations
ER  -