Table 4.

Duncan’s Multiple Range Test of the Pascopyrum smithii seed yield (Z) and yield components (Y₁–Y₅) for the 3 years and of the ridge regression coefficients.

	year		N	Y1	Y2	Y3	Y4	Y5	Z
Duncan’s Multiple Range Test
	2003		105	646.14 a	17.5805 a	12.5887 a	5.7998 a	4.8564 a	822.21 a
	2004		129	236.44 b	18.3464 c	7.3498 b	4.4944 b	4.5575 ab	492.49 b
	2005		146	401.85 c	18.7094 b	7.5531 c	4.7874 c	4.5718 b	473.47 c
	F Value			363.244	27.27	31.13	29.11	159.52	132.88
	Pr > F			<0.0001	<0.0001	<0.0001	<0.0001	<0.001	<0.0001
Ridge regression coefficients
k	year	Intercept		Y1	Y2	Y3	Y4	Y5	Z
0.77	2003	529.067		0.371	19.944	15.127	−55.349	−29.703	−1
0.64	2004	444.094		0.358	2.075	−2.205	−0.920	−4.078	−1
0.79	2005	271.685		0.381	14.551	−7.485	18.647	−48.165	−1

Means with the same letter are not significantly different at Alpha = 0.05.