Table 2.
Single-factor test factors and levels.
| Factors | Level | ||||
|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | |
| Seedling age/d | 20 | 25 | 30 | 35 | 40 |
| Forward speed (v)/km·h−1 | 1 | 1.25 | 1.5 | 1.75 | 2 |
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