Fig. 3. AMMI-1 plot of 123 genotypes from the 1990 NTEP perennial ryegrass variety trial. IAS-1 = interaction scores for the first interaction axis, IAS-1 scores close to zero indicate little or no interaction (IAS-1 scale in units equivalent to the square root of turfgrass quality). Displacement along the vertical axis indicates interaction differences between genotype. Displacement along the horizontal axis indicates differences in genotype main effects.

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