Fig. 3 The relationship between grain yield per unit area and coefficient of variation for individual plant grain yield at physiological maturity for six maize hybrids grown in four environments. Data points include four hybrids at 11 plants m-2 at Cambridge, Ontario in 1996; six hybrids at 7.0 plants m-2 at two soil nitrogen levels at Cambridge, Ontario in 1996; 11 plants m-2 at Cambridge, Ontario in 1997; and two hybrids at 11 plants m-2 at Elora, Ontario in 1997. The hybrids Pride 5, Warwick 263, Pioneer 3902, and NK 2555 were used in the test at Cambridge in 1996 and 1997; PAG SX111 and Pioneer 3893 were included at Cambridge in 1997. Pride 5 and Pioneer 3902 were used for the test at Elora, and CV values were taken from four replications for each hybrid
