Table 3. Index of agreement (d) of maturity dates and grain yield.

	d-index
Year	Maturity	Yield
1981	−1.37	0.674
1982	0.945	0.260
1983	0.276	0.662
1984	0.593	0.972
1985	0.960	0.796
1986	0.442	0.521
1987	0.748	0.001
1988	0.992	1.000
1989	0.950	0.959
1990	0.111	0.674

Note: both maturity and yield were measured only once each year.