Improving the prediction performance of leaf water content by coupling multi-source data with machine learning in rice (Oryza sativa L.)

Table 3 Coefficient of determination (R²) of predicting LWC by different vegetation index at different growth stages in rice plants

Growth stage	ND_(1287,1673)	NDVI	NDII	NDWI	WI	MSI
Booting	0.48**	0.01	0.26**	0.00	0.01	0.22**
Flowering	0.64**	0.02	0.48**	0.06	0.27**	0.47**
Initial grain filling	0.57**	0.24**	0.30**	0.03	0.09*	0.30**
Middle grain filling	0.53**	0.01	0.34**	0.32**	0.34**	0.34**

* and ** indicate significant correlation at 5% and 1% probability level, respectively. ND_(1287,1673) is the normalized difference index; NDVI is the normalized difference vegetation index; NDII represents the normalized difference infrared index; NDWI is the normalized difference water index; WI shows the water index; MSI represents the moisture stress index

ISSN: 1746-4811