relation: http://oar.icrisat.org/1524/
title: Stratification of SADC regional pearl millet testing sites based on grain yield performance of lines
creator: Mgonja, M A
creator: Monyo, E S
creator: Chandra, S
creator: Murambadoro, D
creator: Chinhema, E
subject: Millets
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.
publisher: Elsevier
date: 2002
type: Article
type: PeerReviewed
format: application/pdf
language: en
identifier: http://oar.icrisat.org/1524/1/FieldCcropRes73_2-3_143-151_2002.pdf
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.      
relation: http://dx.doi.org/10.1016/S0378-4290(01)00191-5