|  | Total shoot mass (mt,d) | ||
---|---|---|---|---|
Soil layer | Depth | >10 mg | >100 mg | >200 mg |
O | 0–1 cm | no effect of transpiration | ||
A1 | 1–5 cm | 1.05 Ψ | 1.1 Ψ | 1.2 Ψ |
A2 | 5–10 cm | 1.1 Ψ | 1.3 Ψ | 1.4 Ψ |
A3 | 10–15 cm |  | 1.3 Ψ | 1.4 Ψ |
A4 | 15 cm – C |  |  | 1.2 Ψ |
C | >16 ... >30 cm | no effect of transpiration |