Soil requirements of tree roots.
| Minimum Required | Maximum Tolerated | |
| Oxygen in soil atmosphere | 2.5% | 21% |
| Water content in soil | 12% | 40% |
| Temperature of soil | 40°F | 94°F |
| pH of soil (wet) | 3.5 | 8.2 |
| Density of clay soils | - | 1.4 g/cc |
| Density of silt soils | - | 1.4 g/cc |
| Density of sandy soils | - | 1.8 g/cc |
| Air pore space in soil | 12% | - |
This list does not include nutrients that tree roots take in such as Nitrogen, etc. It is a list of the characteristics that the soil must have for roots to live in the soil.
