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Testing Wheat in Variable Environments: Genotype, Environment, Interaction Effects, and Grouping Test Locations

^a Dep. of Agronomy, 2004 Throckmorton Hall, Kansas State Univ., Manhattan, KS 66506-5504
^b Dep. of Statistics, 101 Dickens Hall, Kansas State Univ., Manhattan, KS 66506-5504. Contribution No. 07-226-J Kansas Agricultural Experiment Station, Kansas State Univ

View larger version (20K): [in this window] [in a new window]   Figure 1. Winter wheat test locations and their location codes in Kansas. C, central region; E, east region; I, irrigated region; W, west region.

View larger version (45K): [in this window] [in a new window]   Figure 2. Annual genotype, genotype-by-environment (GGE) biplots for Kansas wheat performance tests, 1982, 1985, 1994, and 1996. TSS = total sum of squares; PC1, first principle component; PC2, second principle component.

View larger version (90K): [in this window] [in a new window]   Figure 3. Annual genotype, genotype-by-environment (GGE) biplots for Kansas wheat performance tests, 2003 and 2004. TSS = total sum of squares; PC1, first principle component; PC2, second principle component.