°C
|
+5 cm |
|
|
-5 cm |
|
|
-10 cm |
|
|
-20 cm |
|
°C |
||||
|
11.4 | 0 | ||
|
16.6 | 0 | ||
|
16.2 | 29 | ||
|
16.9 | 10 |
| 0-10 | Saturated soil |
| 11-30 | Soil is adequately wet (except coarse sands which are drying out at this range). |
| 31-60 | Usual range to water (except heavy clay soils). Water at the upper end of this range in cool humid climates and with higher water-holding capacity. |
| 61-100 | Usual range to irrigate heavy clay soils. |
| 101-200 | Soil is becoming dangerously dry for maximum production. |