Stratification of SADC regional sorghum testing sites based on grain yield of varieties |
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Institution: | 1. Africa Rice Center (AfricaRice), East and Southern Africa, P.O. Box 33581, Dar-es-Salaam, Tanzania;2. Division of Social and Institutional Change in Agricultural Development (Hans-Ruthenberg-Institute), University of Hohenheim, Germany;3. Research Program on Markets, Institutions and Policies (MIP), International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru 502324, Telangana, India |
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Abstract: | We applied sequential retrospective (SeqRet) pattern analysis to stratify sorghum variety testing sites according to their similarity for yield discrimination among genotypes using historical grain yield data from 147 multi-environment trials (METs). The trials were conducted at 38 sites in 10 countries of the Southern African Development Community (SADC) region during 1987/1988–1992/1993 and 1999/2000. The analysis for the 6 years 1987/1988–1992/1993, covering 34 sites, clustered these sites into 6 major groups with a model fit of R2 = 0.75. With additional data from the year 1999/2000, the SeqRet pattern analysis delivered a very similar clustering of the 34 sites, with the additional four sites in 1999/2000 properly classified with appropriate site groups (R2 = 0.74). The results suggest that future sorghum variety testing could be restricted to a few representative sites selected from within each of the six identified site-groups. |
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