Multivariate Assessment Of Environmental Effects On Grain Yield And Component Characters Of Tef (eragrostis Te(zllcc.) Trotter) Genotypes

Tllis study was designed to attain a better understanding of envirollllental factors such as soil andrnclimate that could account for variation in grain yield and component characters of tef genotypes,rnFurthennore, it was intended to determine the source of variability in the relationships among grainrnyield and component characters within and among tef genotypes. In the study, 7 and 4 variables ofrnsoil and climate, respectively were collected from four locations for the crop seasons 1991/92,rn1992/93 and 1993/94. Five plant variables of 12 tef genotypes were also collected for the samernlocations and crop seasons. Combined analysis of variance, analysis of variance components,rncanorucal correlation analysis and principal component analysis were used to analyse the data,rnThe results of the study, based on combined analysis of variance and analysis of variance components,rnrevealed that soil and climate variables accounted for a large portion of the variation in grain yield andrncomponent characters of tef genotypes. The results of canonical correlation analysis also supportedrnthis fact. The results of principal component analysis showed that each of the genotype variablesrnconsidered in this study had their own share of contribution to the variation within and amongrngenotypes.

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