Table 5.

Correlations of SPAD, LAI and Chl with grain yield at different growth stages in experiments 1, 2, and 4.

Experiment No.	Cultivar	Growth stage	SPAD		LAI		Chl
			R2	RRMSE	R2	RRMSE	R2	RRMSE
Experiment 1 2007	9,915	TI	0.77**	0.5	0.85**	0.36	0.93***	0.17
		SE	0.81**	0.7	0.83**	0.68	0.92***	0.14
		PI	0.73*	0.41	0.89**	0.51	0.94***	0.19
		BT	0.78**	0.51	0.66*	0.4	0.90***	0.29
		HD	0.81**	0.32	0.88**	0.95	0.92***	0.18
	27,123	TI	0.81**	0.36	0.92***	0.5	0.94***	0.19
		SE	0.77*	0.51	0.83**	0.7	0.97***	0.16
		PI	0.81**	0.4	0.86**	0.41	0.99***	0.11
		BT	0.67*	0.43	0.64*	0.51	0.78**	0.51
		HD	0.83**	0.59	0.92***	0.32	0.91***	0.22
	Normalized		0.79**	0.49	0.83**	0.53	0.88***	0.21
Experiment 2 2008	WXJ-14	TI	0.79**	0.4	–	0.47	0.92***	0.18
		SE	0.77**	0.31	0.84**	0.46	0.96***	0.15
		PI	0.75*	0.4	0.99***	0.43	0.87***	0.28
		BT	0.75*	0.31	0.85**	0.59	0.96***	0.16
		HD	0.83**	0.21	0.76*	0.49	0.98***	0.13
	27,123	TI	0.77*	0.14	0.09ns	–	0.98***	0.12
		SE	0.79**	0.29	0.73**	0.31	0.97***	0.14
		PI	0.8**	0.56	0.88**	0.21	0.90***	0.2
		BT	0.84**	0.52	0.96***	0.14	0.99***	0.1
	Normalized		0.81**	0.41	0.84**	0.29	0.86***	0.24
Experiment 4 2013	WYJ-19	TI	0.79**	0.5	0.81**	0.56	0.94***	0.15
		SE	0.49ns	–	0.87***	0.52	0.94***	0.16
		PI	0.83**	0.28	0.97***	0.43	0.97***	0.13
		BT	0.72*	0.57	0.84**	0.52	0.88***	0.26
		HD	0.81**	0.46	0.96***	0.41	0.93***	0.19
		FL	0.82**	0.31	0.76*	0.5	0.97***	0.14
	YY-8	TI	0.81**	0.21	0.79**	0.92	0.87***	0.22
		SE	0.33ns	0.14	0.98***	0.18	0.95***	0.17
		PI	0.6*	0.29	0.86***	0.33	0.92***	0.19
		BT	0.71*	0.56	0.95***	0.28	0.90***	0.24
		HD	0.79**	0.18	0.76*	0.57	0.91***	0.13
		FL	0.89***	0.33	0.86***	0.46	0.88***	0.37
	Normalized		0.75*	0.28	0.81**	0.4	0.92***	0.24

ns and “–” mean non-significance.

^*F-test statistical significance at 0.05 probability level;

^**F-test statistical significance at 0.01 probability level;

^***F-test statistical significance at 0.001 probability level.