| 2 | Grain yield stability analysis using parametric and nonparametric statistics in oat(Avena sativa L.)genotypes in Ethiopia显示文摘Background:The performance of oat genotypes differs across environments due to variations in biotic and abiotic factors.Thus,evaluation of oat genotypes across diverse environments is very important to identify superior and stable genotypes for yield improvement.Methods:The study aimed to assess the interaction(genotype-by-environment interaction;GEI)effect and determine the stability of grain yield in oat(Avena sativa L.)genotypes in Ethiopia using parametric and nonparametric stability statistics.Twenty-four oat genotypes were evaluated in nine environments using a randomized complete block design replicated three times.Results:The pooled analysis of the variance of grain yield showed significant variations among genotypes,environments,and their interaction effects.Significant GEI revealed the rank order change of genotypes across environments.The environment main effect captured 44.62%of the total grain yield variance,while genotype and GEI effects explained 28.84%and 26.54%of the total grain yield variance,respectively.The grain yield stability was assessed based on 12 parametric and two nonparametric stability statistics.The results indicated that genotypes with superior grain yield-showed stable performance on the basis of the stability parameters of the genotypic superiority index(Pi),the Perkins and Jinks adjusted linear regression coefficient(Bi),and the yield stability index(YSI),indicating that selection using these stability parameters would be efficient for grain yield enhancement in oat genotypes.Spearman's rank correlation coefficients also showed that the stability parameters of Pi,Bi,and YSI had a significant positive association with grain yield.However,grain yield had an inverse correlation with the stability parameters of standard deviation,deviation from regression S(di)2,the Hernandez desirability index(Dji),Wricke ecovalence(Wi),the Shukla stability variance(σi2),the AMMI stability value(ASV),and environmental variance S()i(2),indicating that oat genotype selection using these stability parameters would not be efficient for yield enhancement because these stability parameters favor low-yielding genotypes more,compared to high-yielding ones.Conclusions:Therefore,G5,G8,G11,G12,G14,G16,G17,G19,and G22 genotypes were adaptable in all nine environments based on stability parameters of Pi,Bi,and YSI,and selection of these superior genotypes would improve grain yield in oat genotypes.However,the validity of this result should be confirmed by repeating the experiment in the same environments over two or more years. | Gezahagn Kebede Walelign Worku Habte Jifar Fekede Feyissa | 2023 | Grassland Research2023，2，3： | 0 |
| 3 | Multilingual Practices and Multiple Contestations in the Linguistic Landscape of Selected Towns in Oromia:A geosemiotic perspective显示文摘This study analyzed a linguistic landscape,which is a relatively recent development in sociolinguistic research committed to the investigation of the visual manifestations of the relationships observed between language or semiosis and society in the public space.There has been less attention on the semiotic interpretations in the public environments despite the ubiquitous nature of such signs in Ethiopia.This study intends to fill this gap through Semiotic Landscape research.By means of mixed methods,qualitative and quantitative,it aims to discover the contestations in the Linguistic Landscape(LL,henceforth)of selected urban environments in Oromia.The study employed a theoretical concept of geosemiotics from social semiotics as an analytical tool.Visual data consisting of 1275 photographs of signs were collected from the main streets of Adama,Jimma and Sebeta towns from different domains of sign using bodies.Besides,data were collected through in-depth interviews with major LL actors,selected based on purposive sampling technique.The analysis demonstrated that some top-down and most of bottom-up signs showed varieties of multilingual practices,contestations,identity constructions and other related social concerns.The absence of a clear policy on language use on signs at both federal and regional levels has resulted in contestations. | Alemayehu Fekede Wondowsen Tesfaye | 2020 | 宏观语言学2020，8，1： | 0 |
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