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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

A shifted multiplicative model fusion method for grouping environments without cultivar rank change  [1995]

Crossa, J. (International Maize and Wheat Improvement Center, CIMMYT, Mexico, Mexico); Cornelius, P.L.; Sayre, K.; Ortiz-Monasterio R, J.I.;

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Genotype X environment interactions of most concern to plant breeders involve cultivar rank change across environments, i.e., crossover interaction (COI). When COIs are present, cluster strategies can be used to group environments without significant changes in cultivar ranks. Several methods for classifying environments without COI have recently been proposed. In this study, the shifted multiplicative model (SHMM) fusion method based on a building block principle is used for grouping environments which rank cultivars similarly. The SHMM fusion selects the best action by computing for each new cluster formed, a new set of distance measures with the other dusters and with the unclustered individuals. Experimental data were collected on 55 cultivars evaluated under five irrigation levels in each of two trials (10 environments). Groups of environments obtained with SHMM fusion were compared with those obtained using cluster analysis based on Euclidean distances computed from unstandardized and standardized data. The SHMM fusion formed four find clusters of environments. The final clusters grouped environments with similar irrigation levels. Conventional cluster analysis based on Euclidean distances produced final clusters with much larger percentage of COIs than SHMM fusion. Results show that SHMM fusion is a useful strategy for classifying environments without cultivar rank change
From the journal
Crop science (USA)
ISSN : 0011-183X

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
1996
Volume:
35
Issue:
1
Start Page:
54
End Page:
62
All titles:
"A shifted multiplicative model fusion method for grouping environments without cultivar rank change"@eng
Other:
"references"
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
1996
Volume:
35
Issue:
1
Start Page:
54
End Page:
62
All titles:
"A shifted multiplicative model fusion method for grouping environments without cultivar rank change"@eng
Other:
"references"