Soil Temperature and Moisture Tables
| Soil Temperature (F) | Soil Conditions | |
| Less than 20 Degrees |
Deep Freeze - Winter Kill Imminent |
|
| Less than 33 Degrees |
Frost Line - Soil Frozen |
|
| Less than 50 Degrees |
Too Cold To Plant - Root Growth Only |
|
| 51 - 59 Degrees |
Minimum Growth / Optimal Root Growth |
|
| 60 - 75 Degrees |
Optimal Growth |
|
| 76 - 90 Degrees |
Ideal Growth |
|
| Soil Moisture | Soil Conditions | |
| The centibar (cb) is an agricultural unit of soil water tension (water pressure on plant roots) | ||
| 0-10 cb |
Saturated Soil (Free Water Range). |
|
| 11-30 cb |
Soil is adequately wet (Field Capacity Range). |
|
| 31-60 cb |
Irrigation Initiation range for most soils. |
|
| 61-100 cb |
Usual range for irrigation in heavy clayey soils (Limit of Readily Available Water). |
|
| 101-200 cb |
Soil is dangerously dry. |
|
