Table 3.

Correlation coefficients between hyperspectral characteristic variables and wheat LNA (n = 144).

Hyperspectral characteristic variable	r
Db	−0.014
λb	0.031
Dr	−0.893**
λr	0.820**
Dy	0.843**
λy	−0.009
Rg	−0.186*
λg	−0.194*
Ro	−0.143*
SDr	0.911**
SDb	−0.821**
SDy	−0.146
SDr/SDb	−0.214*
SDr/SDy	0.201*
Rg/Ro	0.151
(SDr−SDb)/(SDr+SDb)	0.941**
(SDr−SDy)/(SDr+SDy)	0.856**
(Rg−Ro)/(Rg+Ro)	−0.137

^*P < 0.05, | r | > 0.174;

^**P < 0.01, | r | > 0.228. The same below.