Table 2 Statistics of the linear regression analysis between color index b ^* and SPAD readings in different development stages and cultivars in 2011

From: Estimating rice chlorophyll content and leaf nitrogen concentration with a digital still color camera under natural light

		Vegetative	Tillering	Jointing	Booting	All stages
Liangyoupeijiu	R²	0.74^**	0.62^**	0.92^**	0.86^**	0.80^**
Liangyoupeijiu	RMSE^a	0.87	1.18	0.86	1.23	1.24
Nanjing45	R²	0.42^**	0.28^**	0.90^**	0.79^**	0.60^**
Nanjing45	RMSE	1.61	1.41	0.64	0.91	1.60
Nanjing46	R²	0.83^**	0.52^**	0.82^**	0.83^**	0.59^**
Nanjing46	RMSE	0.94	1.62	1.47	1.26	1.85
All cultivars	R²	0.31^**	0.64^**	0.65^**	0.61^**	0.53^**
	RMSE	1.94	1.66	1.87	2.59	2.23

Dependent variable: SPAD.
^**indicate the significance at P < 0.01.
^aRoot mean square error.

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ISSN: 1746-4811

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