Table 2.
The performances for the models with one single growth stage involved.
| Grow stage | Model Expression | R2 | RMSE(kg/ha) |
|---|---|---|---|
| Tillering stage (TS) | y = -0.13 + 1.06x1 | 0.60 | 285.89 |
| Jointing stage (JS) | y = 0.45 + 0.50x2 | 0.70 | 250.35 |
| Booting stage (BS) | y = -0.60 + 1.55x3 | 0.75 | 228.04 |
| Heading stage (HS) | y = 0.19 + 0.77x4 | 0.66 | 270.02 |
| Filling stage (FS) | y = 0.67 + 0.30x5 | 0.56 | 304.10 |
| Ripening stage (RS) | y = 0.68 + 0.29x6 | 0.52 | 318.39 |
x1 is RNDVI[720,880] at tillering stage, x2 is RNDVI[744,808] at jointing stage, x3 is RNDVI[712,880] at booting stage, x4 is RNDVI[736,888] at heading stage, x5 is RNDVI[744,808] at filling stage, x6 is RNDVI[744,872] at ripening stage.