Table 1.
Basic information about different field experiments.
Figure 1.
Changes of LEWT under different water treatments at N2 (A) and varied nitrogen treatments at W3 (B) in Exp. 1.
Figure 2.
Reflectance of leaves under different LEWT at N2 (A) and LNC at W4 (B) in Exp. 1.
Figure 3.
The correlation of LEWT and LNC to original spectral reflectance (A) and its first derivative (B) in Exp. 1.
Figure 4.
Contour map of coefficients of determination (R2) for linear relationship between NDSI and LEWT (A: calibration dataset, B: validation dataset).
Figure 5.
Quantitative relationships between NDSI (R1204, R1318) and LEWT (A); the 1∶1 relationship between the predicted and observed LEWT based on NDSI (R1204, R1318) (B).
Table 2.
Simple grouping linear analysis of the model between NDSI and LEWT in wheat before and after anthesis.
Figure 6.
Contour map of the linear relationship with top 15% R2 between NDSI and LEWT before (A) and after (B) anthesis, and the common area between A and B (C).
Figure 7.
Quantitative relationships between NDSIe (R1445, R487) and LEWT before anthesis (A); quantitative relationships between NDSIt (R1714, R1395) to LEWT after anthesis (B).
Figure 8.
The 1∶1 relationship between the predicted and observed LEWT based on NDSIb (R1445, R487) for wheat before anthesis (A); the 1∶1 relationship between the predicted and observed LEWT based on NDSIa (R1714, R1395) for wheat after anthesis (B).
Figure 9.
Quantitative relationships between (R1429−R416)/(R1429+R416) and LEWT (A); the 1∶1 relationship between the predicted and observed LEWT on (R1429−R416)/(R1429+R416) in wheat (B).
Table 3.
Relationships of spectral indices to LEWT (n = 271) and testing performances (n = 308) in wheat.
Figure 10.
Quantitative relationships between (R1429−R416−R1865)/(R1429+R416+R1865) between LEWT in wheat (A); the 1∶1 relationship between the predicted and observed LEWT on (R1429−R416−R1865)/(R1429+R416+R1865) (B).