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Mixed-Model Analysis of Crossover Genotype–Environment Interactions

Alberta Agriculture, Food and Rural Development, no. 300, 7000-113 St., Edmonton, AB, Canada T6H 5T6, and Dep. of Agricultural, Food and Nutritional Science, Univ. of Alberta, Edmonton, AB, Canada T6G 2P5

View larger version (27K): [in this window] [in a new window]   Figure 1. Differences in yields (Mg ha–1) for two barley (Hordeum vulgare L.) cultivar pairs, CDC Dolly–Harrington and AC Metcalfe–Harrington, evaluated at 18 sites across Alberta under three linear models (fixed-, mixed-, and random-effect models). The dashed lines represent upper and lower bounds (based on interaction-wise criterion) beyond which significant cultivar differences are indicated.