Table 8.
Multilinear regression (stepwise) of grain yield (GY) as dependent variable and the remote sensing traits (RGB and multispectral vegetation indexes) measured from the unmanned aerial vehicle as independent variables. These indexes are defined at section Material and Methods. R2, determination coefficient; RSE, Residual Standard Error.
| Equation | R2 | RSE | p-Value | ||
|---|---|---|---|---|---|
| Conservation | GY = −4.37 + 0.11·Lightness + 9.23·GA − 0.04·MCARI | 0.351 | 0.521 | 0.000 | |
| Portion of variance | Lightness | 0.237 | |||
| GA | 0.164 | ||||
| MCARI | 0.159 | ||||
| Conventional | GY = 16.56 −0.36·b* − 16.28·SAVI + 2.06·RDVI − 0.02·TCARI/OSAVI | 0.757 | 0.491 | 0.000 | |
| Portion of variance | b* | 0.237 | |||
| SAVI | 0.164 | ||||
| RDVI | 0.159 | ||||
| TCARI/OSAVI | 0.195 | ||||
| Low density | GY = 5.36 − 0.26·b* + 10.21·OSAVI − 13.99·CCI | 0.516 | 0.609 | 0.000 | |
| Portion of variance | b* | 0.203 | |||
| OSAVI | 0.166 | ||||
| CCI | 0.147 | ||||
| High density | GY = 0.517 + 6.44·GGA + 3.14·OSAVI | 0.654 | 0.531 | 0.000 | |
| Portion of variance | GGA | 0.353 | |||
| OSAVI | 0.300 | ||||