Table 6.

Correlation between maize canopy vegetation index NDVI, GNDVI, RVI, GOSAVI, and dry matter quality in different growth stages

Stage	Cultivar	NDVI	GNDVI	RVI	GOSAVI
Trumpet stage	ZD958	0.843**	0.823**	0.806**	0.847**
	XY335	0.774**	0.802**	0.787**	0.800**
	YD606	0.907**	0.882**	0.878**	0.884**
	QL368	0.404	0.736**	0.462	0.736**
	Mixture	0.546**	0.675**	0.500**	0.666**
Filling stage	ZD958	0.942**	0.927**	0.828**	0.927**
	XY335	0.774**	0.802**	0.787**	0.800**
	YD606	0.907**	0.882**	0.878**	0.884**
	QL368	0.772**	0.774**	0.854**	0.770**
	Mixture	0.742**	0.793**	0.743**	0.792**
Maturity	ZD958	−0.516*	−0.705**	−0.702**	−0.378
	XY335	−0.681**	−0.328	−0.681**	−0.280
	YD606	−0.397	−0.055	−0.172	−0.062
	QL368	0.481	0.662**	0.203	0.654**
	Mixture	0.124	0.314*	0.161	0.297*

“*” indicates the significance at the 0.05 level. “**” indicates the significance at the 0.01 level.