Pre-treatment analysis of the relationship among pin oak leaf color, soil pH, and root development.
| Golf course | Streets | |
|---|---|---|
| Soil pH* | ||
| Green trees | 6.3 | 6.9 |
| Yellow trees | 6.6 | 7.0 |
| Root density (cm root length/cc soil)* | ||
| Green trees | 6.94 | 19.85 |
| Yellow trees | 4.65 | 13.66 |
| Color-pH relationship | ||
| Regression coefficient (R) | 0.28 | 0.30 |
| P-value | 0.22 | 0.11 |
| Color-root length relationship | ||
| Regression coefficient (R) | 0.13 | 0.28 |
| P-value | 0.58 | 0.14 |
↵* The difference between values for green and yellow trees was not significant on either site.