Independent variables | Codes | Symbols | Coded and actual values | ||||
---|---|---|---|---|---|---|---|
- 1.682 | −1 | 0 | + 1 | + 1.682 | |||
Soil-water (% FC) | x1 | W | 40 | 48.1 | 60 | 71.9 | 80 |
Nitrogen (N) rate (mg kg−1) | x2 | N | 0 | 24.32 | 60 | 95.68 | 120 |
Phosphorus (P) rate (mg kg−1) | x3 | P | 0 | 36.49 | 90 | 143.51 | 180 |