Stratification of SADC regional pearl millet testing sites based on grain yield performance of lines

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.

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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

Item Type: Article
Author Affiliation: International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) Patancheru, 502 324, Andhra Pradesh, India
Subjects: Plant Production
Crop Improvement > Plant Breeding
Divisions: Millet
Depositing User: Mr B Krishnamurthy
Date Deposited: 14 Jun 2011 05:22
Last Modified: 14 Jun 2011 05:22
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