Stratification of sorghum hybrid testing sites in southern Africa based on grain yield

Mgonja, M A and Chandra, S and Obilana, A B and Monyo, E S and Kudita, S and Chisi, M and Saadan, H M and Chinhema, E (2008) Stratification of sorghum hybrid testing sites in southern Africa based on grain yield. Field Crops Research, 108 (3). pp. 193-197.

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Sequential retrospective (SeqRet) pattern analysis technique was applied to classify sorghum hybrid testing sites in accordance with their similarity for yield differentiation among genotypes. Historical grain yield data from 150 multi-environment trials (METs) conducted at 23 sites in the Southern Africa Development Community (SADC) region during 1987/1988-1992/1993 was used. The sites were clustered into six major environment groups in the SADC region with a model fit of R2=68%. Analysis of these 6 years' data together with additional data from 1999/2000 stratified the 23 sites in the same six major groups (R2=69%), the additional five sites in 1999/2000 classified with appropriate site groups. These results suggest that future sorghum hybrid testing could be cost-effectively conducted in 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: 07 Oct 2011 07:18
Last Modified: 14 Sep 2013 09:31
Official URL:
Funders: United States Agency for International Development
Acknowledgement: The authors are grateful to the scientists of the National Agricultural Research System (NARS) in the SADC region for their collaboration in the implementation of the METs. We also appreciate the financial support provided to the scientists by the Sorghum and Millet Improvement Program (SMIP), a USAID supported sorghum program of the SADC member states. Appreciation is extended to ICRISAT staff who worked on the SMIP project over the years, my colleagues Dan Kiambi and also to the Field Crop Research reviewers for providing constructive criticisms during finalization of this manuscript.
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