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Box–Behnken experimental design and results.
| Test Number |
Seedling Age (X1)/d | Forward Speed (X2)/km·h−1 | Tray Specification (X3) | Matrix Loss Rate/% |
|---|---|---|---|---|
| 1 | −1 | 0 | −1 | 27.49 |
| 2 | −1 | 0 | 1 | 13.05 |
| 3 | 0 | 0 | 0 | 13.56 |
| 4 | 1 | −1 | 0 | 8.33 |
| 5 | 0 | 1 | −1 | 19.98 |
| 6 | 0 | 0 | 0 | 13.86 |
| 7 | 1 | 0 | −1 | 11.13 |
| 8 | 0 | 1 | 1 | 12.01 |
| 9 | 1 | 1 | 0 | 10.36 |
| 10 | 0 | 0 | 0 | 13.86 |
| 11 | 0 | −1 | −1 | 15.00 |
| 12 | 0 | 0 | 0 | 13.86 |
| 13 | 1 | 0 | 1 | 7.51 |
| 14 | −1 | −1 | 0 | 16.27 |
| 15 | 0 | −1 | 1 | 10.88 |
| 16 | −1 | 1 | 0 | 21.00 |
| 17 | 0 | 0 | 0 | 13.86 |
