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

Wang, Yuan; Wang, Dejian; Shi, Peihua; Omasa, Kenji

doi:10.1186/1746-4811-10-36

Plant Methods

Table 1 Correlation coefficients between SPAD readings, leaf nitrogen concentration (LNC, g kg ^-1 ) and image color related indices (digital number from three color models: RGB, HSV and CIE L ^* a ^* b ^* )

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

	SPAD	LNC	L ^*	a ^*	b ^*	b ^* /a ^*	H	R	G	B	r	g	b	INT	VI_Green
SPAD	1.00	0.21	-0.67^**	0.78^**	-0.90^**	0.76^**	0.83^**	-0.68^**	-0.67^**	-0.48^**	-0.76^**	0.01	0.41^**	-0.63^**	0.66^**
LNC	0.32^**	1.00	0.48^**	-0.26^*	-0.06	0.35^**	0.13	0.47^**	0.48^**	0.63^**	-0.37^**	-0.68^**	0.65^**	0.52^**	-0.28^*
L ^*	-0.62^**	0.35^**	1.00	-0.83^**	0.73^**	-0.43^**	-0.63^**	1.00^**	1.00^**	0.96^**	0.38^**	-0.64^**	0.21	1.00^**	-0.90^**
a ^*	0.61^**	-0.04	-0.70^**	1.00	-0.86^**	0.50^**	0.69^**	-0.82^**	-0.84^**	-0.69^**	-0.52^**	0.18	0.17	-0.80^**	0.62^**
b ^*	-0.73^**	-0.35^**	0.54^**	-0.72^**	1.00	-0.86^**	-0.95^**	0.74^**	0.73^**	0.51^**	0.87^**	0.04	-0.51^**	0.68^**	-0.73^**
b ^* /a ^*	0.60^**	0.48^**	-0.29^**	0.36^**	-0.91^**	1.00	0.96^**	-0.45^**	-0.43^**	-0.18	-0.99^**	-0.26*	0.72^**	-0.37^**	0.63^**
H	0.61^**	0.40^**	-0.39^**	0.42^**	-0.91^**	0.97^**	1.00	-0.64^**	-0.63^**	-0.40^**	-0.95^**	-0.09	0.58^**	-0.58^**	0.75^**
R	-0.63^**	0.33^**	1.00^**	-0.68^**	0.56^**	-0.34^**	-0.44^**	1.00	1.00^**	0.96^**	0.39^**	-0.64^**	0.21	1.00^**	-0.92^**
G	-0.62^**	0.35^**	1.00^**	-0.71^**	0.54^**	-0.29^**	-0.39^**	1.00^**	1.00	0.96^**	0.38^**	-0.64^**	0.21	1.00^**	-0.90^**
B	-0.37^**	0.58^**	0.91^**	-0.47^**	0.15^*	0.09	-0.03	0.90^**	0.91^**	1.00	0.12	-0.82^**	0.48^**	0.98^**	-0.83^**
r	-0.56^**	-0.54^**	0.19^**	-0.35^**	0.89^**	-0.99^**	-0.95^**	0.24^**	0.19^**	-0.20^**	1.00	0.36^**	-0.79^**	0.31^**	-0.56^**
g	0.05	-0.66^**	-0.62^**	0.03	0.31^**	-0.44^**	-0.34^**	-0.60^**	-0.61^**	-0.87^**	0.56^**	1.00	-0.86^**	-0.69^**	0.58^**
b	0.27^**	0.69^**	0.27^**	0.17^**	-0.66^**	0.79^**	0.71^**	0.23^**	0.26^**	0.63^**	-0.87^**	-0.90^**	1.00	0.29^*	-0.08
INT	-0.56^**	0.42^**	0.99^**	-0.64^**	0.45^**	-0.20^**	-0.31^**	0.99^**	0.99^**	0.95^**	0.10	-0.70^**	0.37^**	1.00	-0.89^**
VI_Green	0.67^**	-0.10	-0.85^**	0.42^**	-0.65^**	0.62^**	0.68^**	-0.88^**	-0.85^**	-0.68^**	-0.51^**	0.43^**	0.02	-0.83^**	1.00

Numbers in the upper diagonal were calculated with the Liangyoupeijiu (n = 72) dataset and numbers in the lower diagonal were calculated with the combined data of Liangyoupeijiu, Nanjing45 and Nanjing46 in 2011 (n = 240).
^**indicate the significance at P < 0.01, ^*indicate the significance at P < 0.05.

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ISSN: 1746-4811

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