Table 8.
Pattern matrix of the PCA analysis.
| Pattern matrix | |||||||
|---|---|---|---|---|---|---|---|
|
1st year |
2nd year |
||||||
| PC1 | PC2 | PC3 | PC1 | PC2 | PC3 | ||
| Chlorophyll b | 0.963 | Carotenoids | 0.938 | ||||
| Carotenoids | 0.952 | Chlorophyll b | 0.933 | ||||
| NDVI milk | 0.921 | Anthocyanin | 0.887 | ||||
| GNDVI milk | 0.895 | VW | 0.837 | ||||
| Anthocyanin | 0.861 | 0.313 | SPAD milk | 0.784 | |||
| GDDHD | 0.781 | -0.389 | NDVI milk | 0.625 | 0.360 | -0.356 | |
| VW | 0.778 | 0.383 | NTLSM | 0.924 | |||
| GNDVI booting | 0.716 | 0.370 | -0.382 | GRYLD | 0.849 | ||
| NDVI booting | 0.657 | 0.478 | PH | 0.764 | |||
| NTLSM | 0.917 | 0.322 | GDDPM | 0.560 | 0.679 | ||
| GRYLD | 0.417 | 0.645 | GNDVI heading | 0.332 | -0.784 | ||
| PH | -0.377 | 0.452 | TKW | 0.520 | 0.765 | ||
| SPS | -0.888 | GDDHD | 0.561 | -0.699 | |||
| TKW | 0.491 | 0.682 | NDVI heading | 0.336 | 0.416 | -0.623 | |
| GNDVI anthesis | 0.361 | 0.473 | -0.586 | ||||
| SPS | -0.584 | ||||||
| Cumulative variance (%) | 50.01 | 66.52 | 78.46 | Cumulative variance (%) | 46.56 | 66.33 | 79.97 |
PCA was based on agronomic traits, anthocyanin, carotenoids, chlorophyll b, NDVI and GNDVI at booting and milk stage for the 1st year and on the agronomic traits, anthocyanin, carotenoids, chlorophyll b, SPAD at milk stage, NDVI at heading and milk stage and GNDVI at heading and anthesis for the 2nd year. GRYLD, Grain yield; NTLSM, number of tillers per m2; SPS, seeds per spike; VW, volume weight; TKW, thousand kernel weight; PH, plant height; GDDHD, growing degree days to heading; GDDPM, growing degree days from heading to physiological maturity.