Stratification of SADC regional sorghum testing sites based on grain yield of varieties

Mgonja, M A and Chandra, S and Monyo, E S and Obilana, A B and Chisi, M and Saadan, H M and Kudita, S and Chinhema, E (2006) Stratification of SADC regional sorghum testing sites based on grain yield of varieties. Field Crops Research, 96 (1). pp. 25-30.

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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.

Item Type: Article
Subjects: Mandate crops > Sorghum
Depositing User: Library ICRISAT
Date Deposited: 15 Oct 2011 04:02
Last Modified: 15 Oct 2011 04:02
Official URL:
Acknowledgement: UNSPECIFIED
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