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        <dc:title>Stratification of SADC regional pearl millet testing sites based on grain yield performance of lines</dc:title>
        <dc:creator>Mgonja, M A</dc:creator>
        <dc:creator>Monyo, E S</dc:creator>
        <dc:creator>Chandra, S</dc:creator>
        <dc:creator>Murambadoro, D</dc:creator>
        <dc:creator>Chinhema, E</dc:creator>
        <dc:subject>Millets</dc:subject>
        <dc:description>Sequential retrospective (SeqRet) pattern analysis was used to stratify pearl millet [Pennisetum glaucum] testing sites according to their similarity of line-yield differentiation using grain yield data from 90 multi-environment trials (METs) conducted in the Southern African Development Community (SADC) region. The METs, conducted across 25 sites over 9 years were split into two sets: Set 1 (1989/90-1992/93) included introductory genetic materials, and Set 2 (1994/95-1998/99) included advanced genetic materials. Site stratification analysis from Set 1 and Set 2 partitioned the testing sites into six and five groups with R2-values of 76 and 79%, respectively. Analysis of the cumulative dataset (1989/90-1998/99) clustered the 25 sites into six groups with R2=76% and captured the major patterns of site similarities in Set 1 and Set 2. Based on our experience from running multi-year METs in the SADC region, the cumulative dataset was more informative in judging the relevance of site-stratification results. SeqRet pattern analysis, exploiting available highly imbalanced historical MET data, provided an objective basis for stratifying the test-sites to facilitate selection of a few representative test-sites for future testing of lines. The results from cumulative dataset suggest that future line testing could be restricted to a few sites picked from within each of the identified site-groups.</dc:description>
        <dc:publisher>Elsevier</dc:publisher>
        <dc:date>2002</dc:date>
        <dc:type>Article</dc:type>
        <dc:type>PeerReviewed</dc:type>
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        <dc:language>en</dc:language>
        <dc:identifier>http://oar.icrisat.org/1524/1/FieldCcropRes73_2-3_143-151_2002.pdf</dc:identifier>
        <dc:identifier>  Mgonja, M A and Monyo, E S and Chandra, S and Murambadoro, D and Chinhema, E  (2002) Stratification of SADC regional pearl millet testing sites based on grain yield performance of lines.  Field Crops Research, 73 (2-3).  pp. 143-151.      </dc:identifier>
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