Fig. 2. Relationship between relative grain yield and plant spacing variation (PSV) for two-, four-, and eight-plant patterns at 74000 plants ha^–1 (y = 96.4, if x < 12.0 and y = 109.1 – 1.06x, if x > 12.0; R² = 0.57). Relative grain yield was determined for each plot as yield divided by the average yield from the greatest yielding PSV treatment for each environment.