Treatment of chlorotic white oak in 1978.
| Treatment | Number of trees | Color rating | Color increase | |||
|---|---|---|---|---|---|---|
| 6/78 | 8/78 | 8/79 | 1st year | 2nd year | ||
| Ferric ammonium citrate | 26 | 5.4 | 6.1 | 6.4 | 0.7 | 1.0 |
| Manganese sulfate | 7 | 5.6 | 6.2 | 6.4 | 0.5 | 0.8 |
| Control | 10 | 3.9 | 4.0 | 4.8 | 0.1 | 0.9 |
Average tree size: 20.8 in dbh (range 14-30 in).